94 results on '"eco-efficient"'
Search Results
2. Development of Eco-Efficient UHPC and UHPFRC by Recycling Granite Waste Powder (GWP)
- Author
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Bouchard, David, Sanchez, Thomas, Sorelli, Luca, Conciatori, David, Serna, Pedro, editor, Llano-Torre, Aitor, editor, Martí-Vargas, José R., editor, and Navarro-Gregori, Juan, editor
- Published
- 2022
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3. Development of Eco-efficient Geopolymer Masonry for Sustainability
- Author
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Radhakrishna, Venugopal, K., Malik, Junaid Ahmad, editor, and Marathe, Shriram, editor
- Published
- 2022
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- View/download PDF
4. Development of an artificial neural network model to predict waste marble powder demand in eco‐efficient self‐compacting concrete.
- Author
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Acikgenc Ulas, Merve
- Subjects
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SELF-consolidating concrete , *NEURAL development , *MARBLE , *MANUFACTURING processes , *CONCRETE industry , *ARTIFICIAL neural networks , *POWDERS , *COMPOSITE columns - Abstract
The marble industry produces large amount of waste at almost every stage of marble processing. This waste is always uncontrollably discharged into open areas. Therefore, the consumption of Waste Marble Powder (WMP) in concrete is very important and will provide both an economic gain for concrete industries and an opportunity to achieve eco‐efficient concrete production. Self‐Compacting Concrete (SCC) is mostly preferred concrete type which uses the WMP as powdered material. Thus, to increase WMP usage in the production of eco‐efficient SCC, it is aimed in this study to develop a model that can predict WMP demand. To develop this model, Artificial Neural Network (ANN), an artificial intelligence method, was preferred. An ANN model was developed using a comprehensive dataset that included eco‐efficient SCC mixture compositions, workability measurements, and compressive strengths. The ANN model with seven inputs and one output as WMP was successfully trained and managed to produce the correct outputs to both validation and test datasets. Mix design of SCC with aimed properties can be a long process compared to conventional concrete. The proposed ANN model could reduce time loss in the production process. ANN's success is expected to facilitate the production of eco‐efficient SCC with WMP. [ABSTRACT FROM AUTHOR]
- Published
- 2023
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- View/download PDF
5. Effect of Hydrogen Peroxide on the Thermal and Mechanical Properties of Lightweight Geopolymer Mortar Panels.
- Author
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Alves, Cleidson, Pelisser, Fernando, Labrincha, João, and Novais, Rui
- Subjects
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MORTAR , *THERMAL properties , *HYDROGEN peroxide , *THERMAL resistance , *GREENHOUSE gas mitigation , *THERMAL conductivity , *MODULUS of elasticity , *KAOLIN - Abstract
Lightweight geopolymers have been researched and used in specific applications due to their differentiated properties and, particularly, due to the lower environmental impacts in their manufacture, mainly associated with the use of raw materials with a low environmental impact and the reduction in greenhouse gas emissions. In this study, light geopolymers, using metakaolin, sodium silicate, sodium hydroxide, and hydrogen peroxide (H2O2), were evaluated. The effects of H2O2 concentration were evaluated up to a concentration of 1% in pastes and mortars. The properties of thermal conductivity, density, compressive strength, and modulus of elasticity were determined. The simulation of the thermal transmittance of cladding panels applied to a facade was also performed. Mortars with a H2O2 concentration of 0.2% obtained a compressive strength of 18 MPa and thermal conductivity of 0.55 W/mK, which was 60% less than the thermal conductivity obtained for the reference composition. The simulation of a panel for use on a facade showed that the thermal resistance increased from 0.27 (m2.K/W) to 0.42 (m2.K/W), indicating the efficiency of the geopolymer for use as a thermal control material. [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
- View/download PDF
6. Use of papermaking sludge in the manufacture of bricks for the construction of non-structural walls.
- Author
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Peña Rey, Ferney Oswaldo, Francisco Forero-Garcia, Edwin, and Quezada Romero, Diego Andres
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BRICK building , *PAPERMAKING , *WASTE paper , *PAPER mills , *CELLULOSE , *SLUDGE management - Abstract
The high levels of waste cellulose mud in paper production represent a severe environmental problem regarding its final disposal as a waste by-product. The accumulation of paper sludge and its possible recycling should be focused on its reuse in primary materials or those of continuous use that mitigate its environmental impact. This research was developed to characterize a clay material used in civilian construction with Eco-Efficient properties (hollow ceramic bricks), incorporating waste from paper factories (paper sludge or cellulose sludge) without affecting its mechanical response in comparison with traditional materials, but with the use and advantages of the utilization of residual materials. For this purpose, a physical-chemical characterization of the paper sludge was carried out, accompanied by a physical-mechanical characterization for the Non-structural block obtained with the inclusion of the sludge, in accord with dosages of 0%, 11.1%, 12.5%, 14.3% 16.7% and 20%. As a result, the organic and inorganic byproducts present in the paper waste byproducts were obtained, and the hollow ceramic bricks showed an increase in their mechanical compression capacity under considerable variations in coloration and size. [ABSTRACT FROM AUTHOR]
- Published
- 2023
7. A bi-objective model for eco-efficient dial-a-ride problems.
- Author
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Li-Wen Chen, Ta-Yin Hu, and Yu-Wen Wu
- Subjects
TRAVEL time (Traffic engineering) ,PARATRANSIT services ,PUBLIC transit ,FLEXTIME ,GLOBAL warming ,NATURAL disasters - Abstract
Environmental impact becomes an emerging problem since global warming has caused climate change issues, especially natural disasters in recent years. Based on International Energy Agency (IEA), the concentration of CO
2 in 2015 was 399 parts per million by volume and was about 40% higher than in the mid-1800s. Since the transportation sector accounts for great responsibility for emissions, how to reduce CO2 emissions and keep the efficiency of transportation has become a more important issue. Dial-a-ride Problem (DARP) is a new form of mobility-on-demand public transportation, and the route and schedule of DARP are flexible to accommodate customer needs. This study aims at integrating the concept of ecoefficiency into DARP, and a bi-objective dial-a-ride problem with time-dependent costs is formulated. Two objectives, CO2 emissions and travel time, are explicitly considered. The formulation considers the perspective of eco-efficiency and fluctuation of travel time for the dial-a-ride problem. A revised branch and-price solution algorithm with a large neighbor search (LNS) is adopted to solve the problem. In order to solve the two objectives simultaneously, this study applies the weighted sum with the normalization approach. Due to the difficulties of estimating emissions, a traffic simulation model is incorporated with the solution algorithm to provide emissions values. Several experiments based on a city network are conducted to evaluate objectives based on different factors, including traffic condition, time window, and maximum ride time. The results show that (1) weights for objectives need to be designed appropriately to reflect the preference; (2) the travel times and CO2 emissions reduce with respect to the increase of time window length; (3) The total travel time and CO2 emissions decrease with respect to the length of maximum ride time. [ABSTRACT FROM AUTHOR]- Published
- 2022
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8. Eco-efficient treatment of hazardous bauxite liquid-residue using acid-activated clays
- Author
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Daniel Dodoo, Gertrude Ellen Fynn, Esi Seguwa Chukwufunanya Yawson, Godfred Appiah, Nafiu Suleiman, and Abu Yaya
- Subjects
Eco-efficient ,Bauxite liquid-residue ,Acid-activated kaolin ,Acid-activated bentonite ,Adsorption ,Total iron ,Chemical engineering ,TP155-156 - Abstract
The alumina industry requires a material capable of reducing the high levels of iron and alkalinity in bauxite liquid-residue in an eco-efficient manner while producing fewer by-products. This study looked at the efficacy of acid-activated kaolin (AAK) and acid-activated bentonite (AAB) in reducing the high pH value and iron content of bauxite liquid-residue in a single treatment step. The bauxite residue, AAB, and AAK were characterised using XRD, XRF, and FTIR techniques. A batch adsorption study with varying contact times and adsorbent types was conducted, and the results were analysed using adsorption kinetics and isotherm studies. The results showed that AAK and AAB could effectively remove 88% to 94% of the total iron in the bauxite liquid-residue. Similarly, the initial pH value of the bauxite liquid-residue (9.93 ± 0.13) was reduced by about 3.32% with AAK and 4.53% with AAB, respectively. Thus, batch adsorption studies revealed that adsorption capacity was strongly pH dependent, and the type of adsorbent had an effect on the reduction of iron and pH value in the bauxite liquid-residue. The AAB was found to be more effective than AAK in lowering the high pH value and iron content of the bauxite liquid-residue.
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- 2022
- Full Text
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9. Effect of Hydrogen Peroxide on the Thermal and Mechanical Properties of Lightweight Geopolymer Mortar Panels
- Author
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Cleidson Alves, Fernando Pelisser, João Labrincha, and Rui Novais
- Subjects
lightweight geopolymer ,eco-efficient ,mortar ,Mineralogy ,QE351-399.2 - Abstract
Lightweight geopolymers have been researched and used in specific applications due to their differentiated properties and, particularly, due to the lower environmental impacts in their manufacture, mainly associated with the use of raw materials with a low environmental impact and the reduction in greenhouse gas emissions. In this study, light geopolymers, using metakaolin, sodium silicate, sodium hydroxide, and hydrogen peroxide (H2O2), were evaluated. The effects of H2O2 concentration were evaluated up to a concentration of 1% in pastes and mortars. The properties of thermal conductivity, density, compressive strength, and modulus of elasticity were determined. The simulation of the thermal transmittance of cladding panels applied to a facade was also performed. Mortars with a H2O2 concentration of 0.2% obtained a compressive strength of 18 MPa and thermal conductivity of 0.55 W/mK, which was 60% less than the thermal conductivity obtained for the reference composition. The simulation of a panel for use on a facade showed that the thermal resistance increased from 0.27 (m2.K/W) to 0.42 (m2.K/W), indicating the efficiency of the geopolymer for use as a thermal control material.
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- 2023
- Full Text
- View/download PDF
10. Solving an Eco-efficient Vehicle Routing Problem for Waste Collection with GRASP
- Author
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Expósito-Márquez, Airam, Expósito-Izquierdo, Christopher, Brito-Santana, Julio, Moreno-Pérez, José A., Kacprzyk, Janusz, Series Editor, Del Ser, Javier, editor, Osaba, Eneko, editor, Bilbao, Miren Nekane, editor, Sanchez-Medina, Javier J., editor, Vecchio, Massimo, editor, and Yang, Xin-She, editor
- Published
- 2018
- Full Text
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11. Social Rent Housing Refurbishment Demonstrator of LIFE Project 'New4Old' (LIFE10 ENV/ES/439)
- Author
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Román, Emilia, Gómez, Gloria, de Luxán, Margarita, and Mercader-Moyano, Pilar, editor
- Published
- 2017
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12. Project AURA: Sustainable Social Housing
- Author
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Herrera, Rafael, Pineda, Paloma, Roa, Jorge, Cordero, Sebastián, López-Escamilla, Álvaro, and Mercader-Moyano, Pilar, editor
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- 2017
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13. Environmental Assessment and Energy Certification for the Sustainable Restoration of a Traditional Residential Building
- Author
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Rodríguez-Liñán, Carmen, Morales-Conde, Mª Jesús, Pérez-Gálvez, Filomena, Rubio-de Hita, Paloma, López-Alonso, Silvia, and Mercader-Moyano, Pilar, editor
- Published
- 2017
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14. The Arrabal of Alcázar viejo from Cordoba: Urban, Hereditary and Sustainable Regeneration of the Historic City Centre
- Author
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Cabello Montoro, Rafael and Mercader-Moyano, Pilar, editor
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- 2017
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15. Stabilization of expansive soils with biomass bottom ashes for an eco-efficient construction.
- Author
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Galvín, Adela P., López-Uceda, Antonio, Cabrera, Manuel, Rosales, Julia, and Ayuso, Jesús
- Subjects
SWELLING soils ,ELECTRIC power production ,ELECTRIC power plants ,SOIL stabilization ,HAZARDOUS wastes ,BUILDING demolition - Abstract
Green philosophy is gaining popularity worldwide. Recycling materials from building demolitions, reutilizing by-products from industrial facilities and exploring the potential uses of waste during a second life cycle are the objectives of this philosophy. In the present article, bottom ashes from electric power generation plants using biofuel combustion were evaluated to verify their potential use as expansive clay stabilizers. Two objectives are pursued: (1) finding a new use for waste that is typically landfilled despite its great potential arising from its technical properties and (2) improving the mechanical properties and reducing the expansive nature of the expansive clays identified during the construction of a motorway. Based on this framework, the present study demonstrated the potential of biomass bottom ashes to stabilize expansive clays. The optimum dosage to improve the properties of clays was determined based on performance parameters, such as plasticity, free swelling or soil collapse. Afterwards, the contaminating potential of ashes was evaluated, being classified as hazardous waste. However, the stabilized mixtures were classified as inert products, thus guaranteeing the environmental feasibility of their use. Finally, the technical application of the stabilized clays as filling materials for embankments and subgrade for light traffic roads was proved. [ABSTRACT FROM AUTHOR]
- Published
- 2021
- Full Text
- View/download PDF
16. Leaching behaviour of stabilised expansive soil with biomass bottom ashes as eco-agents.
- Author
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Galvín, Adela P., López-Uceda, Antonio, Ayuso, Jesús, Jimenez Romero, José Ramón, and Barbudo, Auxi
- Abstract
The search for sustainable alternatives for waste disposition other than disposal and evaluation of the feasibility of a second life cycle for waste should be a priority in the research and characterisation of alternative materials. In civil engineering infrastructure applications (e.g. railway, pipe bending, or road construction), large volumes of aggregate are required, which necessitates the consumption of natural resources and significantly impacts soils and the environment in the surrounding area. Occasionally, when the in situ soil does not possess the appropriate mechanical properties or has low load bearing capacity for traffic or other loads, chemical stabilising agents are used to improve the soil characteristics. However, the development and implementation of sustainable alternatives must become a priority in economic, social, scientific, and technical strategies to address current environmental challenges. This study analyses the environmental viability of using eco-friendly agents instead of the chemical additives traditionally used in soil stabilisation. Based on the findings, it is affirmed that the bottom ashes from the combustion of an olive and grape waste biomass in cogeneration plants possess adequate properties as an eco-stabiliser, are not harmful to the environment, and are feasible as an eco-agent for expansive soils in civil engineering works. [ABSTRACT FROM AUTHOR]
- Published
- 2021
- Full Text
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17. Toughness Behavior of SBR Acrylate Copolymer-Modified Pervious Concrete with Single-Sized Aggregates
- Author
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Chaohua Zhao, Hualin Li, Yi Peng, Xiaoyao Jia, and Ali Rahman
- Subjects
eco-efficient ,pervious concrete ,copolymer ,toughness ,sustainability ,Technology ,Electrical engineering. Electronics. Nuclear engineering ,TK1-9971 ,Engineering (General). Civil engineering (General) ,TA1-2040 ,Microscopy ,QH201-278.5 ,Descriptive and experimental mechanics ,QC120-168.85 - Abstract
Pervious concrete is an eco-efficient concrete but has problems regarding its mechanical performance and permeability balance. This research investigated the feasibility of using a combination of styrene–butadiene rubber (SBR) and acrylate polymer to improve the toughness of pervious concrete while keeping its permeability. Single-sized aggregate and no sand were considered in the concrete mixture. Acrylate polymers with different solid content, PH, density, and viscosity were emulsion copolymerized with an SBR polymer. Eleven scenarios with different mix proportions and 220 specimens for compressive strength, flexural strength, flexural stiffness, impact resistance, and fracture toughness tests were selected to evaluate the effects of the copolymer on the toughness of copolymer-modified pervious concrete (CMPC). The studies showed that (1) the influence trend of the copolymers generally varied according to different mechanical indexes; (2) XG–6001 acrylate polymer mainly and comprehensively enhanced the toughness of the CMPC; (3) it was difficult to increase the enhancing property of the XG–6001 acrylate polymer with the growth of its mix proportion; (4) the zero-sand pervious concrete with 90% SBR and 10% XG–6001 acrylate emulsion copolymerization proved to have relatively high toughness. The proposed CMPC holds promising application value in sustainability traffic road construction.
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- 2021
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18. Production and optimization of eco-efficient self compacting concrete SCC with limestone and PET.
- Author
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Mohammed, Mahmoud Khashaa, Al-Hadithi, Abdulkader Ismail, and Mohammed, Marwa H.
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LIMESTONE , *SELF-consolidating concrete , *POLYETHYLENE terephthalate , *MATHEMATICAL models , *CONCRETE waste - Abstract
Graphical abstract Highlights • Production and optimisation of an economic medium to high strength Eco-efficient SCC. • RSM and multi-objectives optimisation used to maximise flow and compressive strength. • Models for both flow and compressive strength have been developed and verified. Abstract This study aims to produce and optimize Eco-efficient self-compacting concrete (SCC) mixes using multi-waste substitutions. The main input parameters of mixes were total binder, fine aggregate and water contents whereas slump flow and compressive strength were the two main operational responses of produced concrete. Limestone powder (LP) and waste Polyethylene Terephthalate (PET) were used in concrete as parts of cement and fine aggregate respectively with high range water reducing admixture (SP) as part of water. Response Surface Methodology (RSM) and multi-objectives optimization using Minitab 17 statistical software were employed for this purpose. Twenty SCC mixes were designed and checked experimentally using Central Composite Design (CCD) concept in RSM. Mathematical models were established and evaluated using analysis of variance test (ANOVA) according to the experimental results. This is in order to define the effectiveness degree of design parameters on the properties required and to adjust the derived mathematical models. Multi-objectives optimization process was adopted to determine the optimum values of the input parameters. The optimization revealed that the optimum values of the input factors, LP, PET and SP were 20.1%, 2.4% and 1.16% by weight respectively. These theoretical values were checked experimentally and the achieved responses were quiet similar or higher than the best proposed mix. It was deduced that the developed models can be used to ensure a speedy mix design process by achieving maximum tested properties of eco-efficient SCC. [ABSTRACT FROM AUTHOR]
- Published
- 2019
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19. The Development of an Innovative Design Process for Eco-efficient Green Products
- Author
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Uang, Shiaw-Tsyr, Liu, Cheng-Li, Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Doug, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, and Kurosu, Masaaki, editor
- Published
- 2013
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20. Efficient self-compacting concrete with low cement consumption.
- Author
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Pelisser, Fernando, Vieira, Alexandre, and Bernardin, Adriano Michael
- Subjects
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FLY ash , *MECHANICAL behavior of materials , *SELF-consolidating concrete , *RHEOLOGY , *COMPRESSIVE strength , *PORTLAND cement - Abstract
Self-compacting concretes (SCCs) must have high fluidity, cohesion and should not segregate. These characteristics of fresh concrete increase the cost of production, particularly for lower projected strengths. In this work, a low Portland cement composition of SCC, with added metakaolin and fly ash (binary and ternary blended cements) was studied to evaluate its rheological and mechanical properties. Materials suitable for the mixture of the SCC were selected, characterized and the maximum packing density of the aggregates was determined. A SCC with a low compressive strength of 28.6 MPa and a cement consumption index of 10.2 kg m −3 . MPa −1 was produced; these values are among the lowest obtained for this type of concrete. An index of 7.8 kg m −3 . MPa −1 has been obtained for SCCs with higher compressive strength (67 MPa). Having defined a dosage strength of 25 MPa, a composition of 1:7.45 (cement:aggregates ratio) was obtained, with cement consumption of 222 kg/m 3 (+49.4 kg fly ash and metakaolin) and a cement consumption index (binder index) of 10.8 kg m −3 . MPa −1 . The results show that it is feasible to produce low strength SCC, with the necessary fluidity and reduced binder consumption, when mineral additions of metakaolin and fly ash are used. This makes SCC more efficient, with important reductions in costs and environmental impact. [ABSTRACT FROM AUTHOR]
- Published
- 2018
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21. Eco-Efficient Prototype Design for Asylum Seeker Housing in Nogales, Sonora: A Parametric Approach
- Author
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Xie, Wen and Xie, Wen
- Abstract
Because of climate change, there are hundreds of millions of people will be displaced from their homes. (Roca Gallery, 2019) Migrants in Nogales who are forced to wait have been suffering. (Reznick,2021) Most of them need a temporary place to live and a way to survive. In addition, Architecture is one of the factors that cause climate change because building construction consumes 40% of the energy in the U.S. annually. (Cramer, 2017) ow to provide the eco-efficient emergency housing to accommodate migrants is an urgent question to address with the emergence of a large number of migrants and global climate change issues. The concept of eco-efficient in building construction and materials is important for the economy and saving energy and resources, it required the building is adapted to the environment, the inputs and outputs of the building to achieve the best state to minimize the impact on the environment.Nogales, Sonora is the largest transborder agglomeration in Arizona. This region is facing migration and environmental issues. Therefore, the objective of this research is to propose an eco-efficient prototype for asylum seeker housing on the Nogales border that responds to the environment and humanitarian crisis. To achieve the research goal, it will be necessary to identify the issue in Nogales, Sonora. Parametric modeling is a promising approach for designing and analyzing the building performance depending on the changing contextual conditions and also analyzing the building life cycle. Through the parametric approach for the building design and analysis, a better solution to the asylum seeker housing prototype design that fits in Nogales may be found.
- Published
- 2022
22. Development of an eco-efficient product/process for the vulcanising industry
- Author
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Becerra, M. B., Zitzumbo, R., Dominguez, J., Garcia, Jorge Luis, Alonso, Sergio, and Hernandez, A.
- Subjects
multi response ,factorial design ,eco-efficient ,vulcanizing ,Industrial engineering. Management engineering ,T55.4-60.8 - Abstract
This paper presents the development of an eco-efficient product/process, which has improved mechanical properties from the introduction of natural fibres in the EPDM (Ethylene-Propylene-Diene-Terpolymer) rubber formulation. The optimisation analysis is made by a fractional factorial design 211-7. Different formulations were evaluated using a multi-response desirability function, with the aim of finding efficient levels for the manufacturing time-cycle, improving the mechanical properties of the product, and reducing the raw material costs. The development of an eco-efficient product/process generates a sustainable alternative to conventional manufacturing.
- Published
- 2014
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23. Desenvolvimento de argamassa ecoeficiente à base de conchas de ostras
- Author
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Monteiro, Rita Beatriz Vilhena, Camões, Aires, Eires, R., and Universidade do Minho
- Subjects
Mortar ,Oyster ,Engenharia e Tecnologia::Engenharia Civil ,Eco-efficient ,Argamassa ,Shell ,Materiais ,Conchas ,Ecoeficiente ,Ostras ,Materials - Abstract
Dissertação de mestrado em Construção e Reabilitação Sustentáveis, O consumo de energia, a extração das matérias-primas e a produção de resíduos são preocupações recorrentes que advém, maioritariamente, da indústria da construção. Tendo isso em vista, a procura e investigação por materiais ecológicos, provenientes de fontes renováveis e da reutilização de resíduos para a produção de materiais de construção, tem sido uma alternativa a suprir a necessidade do uso desses produtos insustentáveis. A calcinação, sendo uma reação química de decomposição térmica, é uma técnica muito empregada para o fabrico de alguns materiais, a qual demanda grande quantidade de energia, além da emissão de dióxido de carbono (CO2). Materiais esses abundantemente empregados na indústria da construção, como a cal viva e o cimento, com este último a corresponder a cerca de 8% das emissões de CO2 entre todas as atividades humanas, segundo dados atuais. Nesse sentido, busca-se investigar o uso de matérias-primas não convencionais, a partir da reciclagem, como proposta à substituição total ou parcial de materiais pouco ecológicos. As ostras, consumidas em todo o mundo, no qual 70% da sua composição é constituída pela concha, órgão rígido de difícil biodegradação e de pouco ou nenhum valor comercial, é frequentemente descartada a céu aberto ou mesmo em lixo comum. Provoca-se, assim, danos ao meio ambiente, uma vez que em grandes quantidades, causam também mau cheiro, liberam toxinas e a proliferação de microrganismos que pode desencadear riscos à saúde humana. Assim, as conchas surgem como uma opção ao desenvolvimento de uma argamassa ecoeficiente, considerando que a sua composição química é essencialmente formada por carbonato de cálcio (CaCO3), regularmente associado à produção de materiais como a cal viva, cal hidratada e o filler calcário, os dois primeiros dotados de propriedades aglomerantes, a ser possivelmente empregue como substituto do ligante tradicional no fabrico de argamassa. Foram estudadas as reações químicas e físicas, além da capacidade de resistência mecânica e de durabilidade da argamassa à base de conchas de ostras. O contributo de propriedades por materiais convencionais poderá ser considerado, em quantidades reduzidas, tendo em vista o foco na sustentabilidade do produto., Energy consumption, the extraction of raw materials and the production of waste are recurrent concerns that arise, mainly, from the construction industry. With this in mind, the search and investigation for ecological materials, from renewable sources and the reuse of residues for the production of construction materials, has been an alternative to supply the need to use these unsustainable products. Calcination, being a chemical reaction of thermal decomposition, is a technique widely used for the manufacture of some materials, which requires a large amount of energy, in addition to the emission of carbon dioxide (CO2). These materials are widely used in civil industry, such as quicklime and cement, with the latter accounting for 8% of CO2 emissions among all human activities, according to current data. In this sense, we seek to investigate the use of unconventional raw materials, from recycling, as a proposal for the total or partial replacement of less ecological materials. Oysters, consumed around the world, in which 70% of their composition is made up of the shell, a hard organ that is difficult to biodegrade and has little or no commercial value, is often discarded in the open air or even in common garbage. This causes damage to the environment, since in large quantities they also cause a bad smell, in order to release toxins and the proliferation of microorganisms that can trigger risks to human health. Thus, shells appear as an option for the development of an eco-efficient mortar, given that their chemical composition is essentially formed by calcium carbonate (CaCO3), regularly associated with the production of materials such as quicklime, hydrated lime and limestone filler, with binding properties, possibly to be used as a binder in the manufacture of mortar. The chemical and physical reactions will be studied, in addition to the mechanical resistance and durability capacity of the mortar based on oyster shells. The contribution of properties by conventional materials can be considered, in reduced quantities, in view of the focus on the sustainability of the product.
- Published
- 2022
24. Efficiency of waste marble powder in controlling alkali–silica reaction of concrete: A sustainable approach.
- Author
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Munir, Muhammad Junaid, Kazmi, Syed Minhaj Saleem, and Wu, Yu-Fei
- Subjects
- *
BUILDING materials -- Equipment & supplies , *RECYCLING industry , *CONSTRUCTION equipment , *SCANNING electron microscopy , *PENETRATION mechanics ,ENVIRONMENTAL aspects - Abstract
Recycling of wastes in building materials is gaining a lot of attention worldwide. This not only conserves natural resources but also enhances the properties of existing building materials leading to economical and environment friendly construction. The main aim of this study was to explore the efficiency of waste marble powder (WMP) in controlling alkali silica reactivity (ASR) of concrete. For this purpose, WMP was obtained from a marble industry. To initiate the ASR phenomena, reactive aggregate was used in the study. Mortar bar specimens prepared with WMP as cement replacement material at 10%, 20%, 30% and 40% replacement levels (by cement weight) were evaluated in the standard ASTM C1260 test method. Compressive strength and thermal analysis tests were performed to investigate the effect of WMP on strength development of concrete. Results of compressive strength and thermal analysis showed improved strength after 10% of cement replacement with WMP. Moreover, 28% and 50% reduction in mortar bar expansion was observed after replacing 10% and 40% of cement with WMP, respectively. Scanning electron microscopic images also showed no signs of ASR cracking for mortar bars incorporating WMP. However, presence of cracks due to ASR was observed in control specimens. Furthermore, energy disperse X-ray spectroscopy (EDS) showed that amount of alkalies reduced after replacing cement with WMP, leading to overcome ASR expansion. Therefore, based on the results WMP can be effectively used to control ASR expansion leading to durable, sustainable and economical construction. [ABSTRACT FROM AUTHOR]
- Published
- 2017
- Full Text
- View/download PDF
25. Eco-efficient ultra-high performance concrete development by means of response surface methodology.
- Author
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Ferdosian, Iman and Camões, Aires
- Subjects
- *
CONCRETE mixing , *RESPONSE surfaces (Statistics) , *COMPRESSIVE strength , *SILICA fume , *OPTIMAL designs (Statistics) - Abstract
The research described in this paper represents a statistically based model with the help of response surface methodology (RSM) aiming to study the applicability of this method to ultra-high performance concrete (UHPC) mixture design and its optimization. Besides, the effects of silica fume, ultra-fine fly ash (UFFA) and sand as three main variable constituents of UHPC on workability and compressive strength as the main performance criteria and responses of this high-tech material were investigated. The models proposed here demonstrate a perfect correlation among variables and responses. Furthermore, through performing a multi-objective optimization, cement and silica fume, as two main constituents of UHPC affecting its eco-efficiency and cost, were substituted by UFFA and sand as much as possible. Finally, an eco-efficient UHPC with cement and silica fume content of 640 kg/m 3 and 56.3 kg/m 3 respectively and compressive strength and flow diameter of 160.3 MPa and 19 cm was developed. [ABSTRACT FROM AUTHOR]
- Published
- 2017
- Full Text
- View/download PDF
26. Ecological impact & financial feasibility of Energy Recovery (EIFFER) Model for natural insulation material optimization.
- Author
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Sagbansua, Lutfu and Balo, Figen
- Subjects
- *
WASTE products as fuel , *ECOLOGICAL impact , *ENERGY consumption of buildings , *EMISSION control , *SENSITIVITY analysis - Abstract
The buildings are major users of energy sources worldwide. The growing concerns on preserving energy as well as ecological impacts of conventional energy resources have resulted in a demand for green buildings. The insulation of external wall has an important impact on the decrease of energy consumption in building design projects that decreases SO 2 –CO 2 emissions. The aim of this study is to determine the optimal thickness of natural insulation material in regards to heating loads at different provinces for a sandwich wall. The optimal insulation thickness in building envelope for fourteen different provinces from two climatic regions is studied. For the region of Eastern Anatolia, payback periods, emissions of SO 2 –CO 2 , and energy savings over 10 years of lifetime, based on insulation thickness and sensitivity analysis are calculated using three types of fuel sources (natural gas, fuel-oil, and coal) and four of the most eco-efficient natural insulation materials (Wood Fiber Plate, Wood Wool Slab, Expanded Perlite, Expanded Cork) based on global warming potential (kg CO 2 -Eq/kg) and water demand (l/kg). Ecological and financial analyses of insulation materials are conducted by an algorithm designed in LINGO optimization software. Results of sensitivity analysis display that the energy saving from natural insulation materials is bigger, more effective, and the payback period is shorter for higher degree-day cities. The study shows that the application of eco-efficient materials in buildings has the potential of substituting the conventional materials. [ABSTRACT FROM AUTHOR]
- Published
- 2017
- Full Text
- View/download PDF
27. Development of eco-efficient self-compacting concrete with waste marble powder using the response surface method.
- Author
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Alyamac, Kursat Esat, Ghafari, Ehsan, and Ince, Ragip
- Subjects
- *
RESPONSE surfaces (Statistics) , *CONCRETE , *MARBLE , *ENVIRONMENTAL health , *POLLUTION - Abstract
Marble sludge is a significant environmental problem for all countries that have a marble stone industry. The problem primarily originates from the impossibility of storing marble sludge. Absorbing, eliminating and recycling waste marble sludge are of great importance in terms of the environmental health, environmental pollution and economic loss of countries. This research study aimed at developing an eco-efficient, eco-friendly and workable self-compacting concrete with the maximum amount of marble powder using the Response Surface Methodology. First, the relationships were determined among the water-to-cement and marble powder-to-cement ratios and the responses, such as slump flow, T-50, V-funnel and compressive strength. Next, a multi-objective optimization technique was used to achieve an eco-efficient self-compacting mixture design with the maximum possible amount of marble powder. As a result, an eco-efficient SCC was obtained with the water-to-cement-ratios less than 0.55 and the marble powder-to-cement-ratios of up to 0.6. [ABSTRACT FROM AUTHOR]
- Published
- 2017
- Full Text
- View/download PDF
28. Toughness Behavior of SBR Acrylate Copolymer-Modified Pervious Concrete with Single-Sized Aggregates
- Author
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Yi Peng, Chaohua Zhao, Hualin Li, Xiaoyao Jia, and Ali Rahman
- Subjects
Acrylate polymer ,Toughness ,Technology ,Materials science ,eco-efficient ,Pervious concrete ,pervious concrete ,Article ,chemistry.chemical_compound ,Fracture toughness ,Flexural strength ,General Materials Science ,Composite material ,Acrylate ,Microscopy ,QC120-168.85 ,Aggregate (composite) ,copolymer ,QH201-278.5 ,toughness ,sustainability ,Engineering (General). Civil engineering (General) ,TK1-9971 ,Compressive strength ,chemistry ,Descriptive and experimental mechanics ,Electrical engineering. Electronics. Nuclear engineering ,TA1-2040 - Abstract
Pervious concrete is an eco-efficient concrete but has problems regarding its mechanical performance and permeability balance. This research investigated the feasibility of using a combination of styrene–butadiene rubber (SBR) and acrylate polymer to improve the toughness of pervious concrete while keeping its permeability. Single-sized aggregate and no sand were considered in the concrete mixture. Acrylate polymers with different solid content, PH, density, and viscosity were emulsion copolymerized with an SBR polymer. Eleven scenarios with different mix proportions and 220 specimens for compressive strength, flexural strength, flexural stiffness, impact resistance, and fracture toughness tests were selected to evaluate the effects of the copolymer on the toughness of copolymer-modified pervious concrete (CMPC). The studies showed that (1) the influence trend of the copolymers generally varied according to different mechanical indexes, (2) XG–6001 acrylate polymer mainly and comprehensively enhanced the toughness of the CMPC, (3) it was difficult to increase the enhancing property of the XG–6001 acrylate polymer with the growth of its mix proportion, (4) the zero-sand pervious concrete with 90% SBR and 10% XG–6001 acrylate emulsion copolymerization proved to have relatively high toughness. The proposed CMPC holds promising application value in sustainability traffic road construction.
- Published
- 2021
29. Central composite design-based development of eco-efficient high-volume fly ash mortar.
- Author
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Du, Sen, Ge, Xin, and Zhao, Qingxin
- Subjects
- *
MORTAR , *FLY ash , *MECHANICAL behavior of materials , *CARBON emissions , *COMPRESSIVE strength , *TENSILE strength - Abstract
• Central composite design-based model was used to develop high-volume fly ash (HVFA) mortar. • These existed strong interaction between fly ash content and limestone powder content or w/cm on the early-age compressive strength of HVFA mortar. • Two scenarios were analyzed considering different optimization goals and importances assigned to variables and responses. • CO 2 intensity can be reduced by 17.57% in the eco-efficient HVFA mortar while ensuring the equivalent strengths. High-volume fly ash (HVFA) mixtures that contain a large amount of fly ash have been widely investigated as sustainable materials with desirable mechanical properties and durability performances at mature ages. However, the low strength at early ages is the main obstacle that limits their wider applications in the practice. This work presents the development of the HVFA mortar with high early-age strength as well as low environmental impact with the help of central composite design-based statistical model. Besides, the effects of fly ash, limestone powder, asphalt emulsion content and water-to-cementitious material ratio (w/cm) as four main variables of HVFA mortar on the compressive strength and splitting tensile strength at curing ages ranging from 7 days to 28 days as the responses of this environmentally friendly material were investigated. Moreover, the multi-objective optimization was conducted to achieve the eco-efficiency of HVFA mortar. In this study, HVFA mortar with fly ash content of 67%, limestone powder content of 5%, no asphalt emulsion and w/cm of 0.25 exhibited 28-d compressive strength of 39.2 MPa and 28-d splitting tensile strength of 3.3 MPa. The optimized mix design of HVFA mortar can ensure the equivalent strength while noticeably reducing the CO 2 intensity (CO 2 emission per compressive strength) by 17.57%. [ABSTRACT FROM AUTHOR]
- Published
- 2022
- Full Text
- View/download PDF
30. 中国农业循环经济标准体系构建与对策.
- Author
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宋成军, 赵学兰, 田宜水, 齐岳, 罗娟, 赵立欣, and 刘天池
- Abstract
Agricultural circular economy is the harmonious development mode of population, resources, environment and the development of modern agricultural growth. Agricultural circular economy is not only an important method to the transformation of the mode of agricultural development in China, but also the important content of the development of green sustainable agriculture to follow China's 13th five-year national development planning proposal. The construction of the standard system of agricultural circular economy is the basis and leading work for the development of circular economy, and the establishment of the standard system is also the key technology and management basis for the development of agricultural circular economy. This paper puts forward the concept of agricultural circular economy in China, and then the research status of the present situation and the main problems of agricultural circular economy both at home and abroad are summarized. It is found that the developed countries have accumulated many successful experiences in the field of agricultural circular economy, but the standard system of agricultural circular economy has not been established. Furthermore, this paper summarizes the research progress and practice in the construction of the standard system of agricultural circular economy in China. This paper focuses on the key links of modern agriculture in the irrigation water, pesticide, fertilizer, energy, land, farming, labor, materials, and comprehensive utilization of wastes, and the agricultural system is divided into 5 stages: Design and development, resource conservation, production and processing, circulation and consumption, recycling and disposal. The systematic and comprehensive characteristics of agricultural circular economy are fully considered, and the construction method, basic structures, three-dimensional structure including industry chain, domain chain and hierarchy chain, construction principles and structure diagram of the standard system of agricultural circular economy are clarified based on the agricultural industry chain and the life cycle of agricultural products. Standard system for agricultural circular economy in China are advanced, and the standard system are divided into basic standards, general management standards, integrating industrial chain standards, methods and specification standards. Finally, the relationship of standard system for agricultural circular economy in China, ecological agriculture and organic agriculture is analyzed, and some relevant standards are put forward for prior setting in accordance with the principle of priority combined with the actual needs of the agricultural circular economy in China. At present, the urgent need to develop the individual criteria mainly includes: agricultural circular economy notation and terminology, classification and code; agricultural circular economy guide for standardization; agricultural solid waste comprehensive utilization technology assessment guidelines; material flow analysis method, ecological efficiency and standard calculation method; agricultural circular economy standardization work guidelines. The formulation of standard system for agricultural circular economy in China ensures the compilation order of the single standard, reduces the standards that are repeating and contradictive, and increases the cohesion and the reasonable matching and composition between the single standard. The standardization and regularization of agricultural circular economy in China are conducive to the improvement of management standardization level of agricultural circular economy, and promote the standardization development of agricultural circular economy in China. [ABSTRACT FROM AUTHOR]
- Published
- 2016
- Full Text
- View/download PDF
31. Statistical mixture design approach for eco-efficient UHPC.
- Author
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Ghafari, Ehsan, Costa, Hugo, and Júlio, Eduardo
- Subjects
- *
STATISTICAL mechanics , *MIXTURES , *HIGH strength concrete , *COMPRESSIVE strength , *NUMERICAL analysis - Abstract
This study presents an innovative analytical method based on statistical mixture design (SMD) approach for eco-efficient ultra-high performance concrete (UHPC) mixtures. This was developed to assess the influence of each parameter as well as the interaction between these on the response variables and thus allowing mixture design. The lack-of-fit test results and the high value of coefficients of multiple determinations showed the adequacy of this analytical method to predict the required performance of eco-efficient UHPC. Furthermore, it was concluded that the incorporation of quartz flour is effective to improve both compressive strength and flowability. Lastly, the numerical optimization indicated that designing an UHPC mixture with a compressive strength exceeding 150 MPa but with low cement content is possible, even without applying heat curing. [ABSTRACT FROM AUTHOR]
- Published
- 2015
- Full Text
- View/download PDF
32. Developing an integrative method and design guidelines for achieving systemic circularity in the construction industry.
- Author
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Antwi-Afari, Prince, Ng, S. Thomas, and Chen, Ji
- Subjects
- *
CONSTRUCTION industry , *CROSS-entropy method , *CONTENT analysis , *KEY performance indicators (Management) , *PRODUCT design - Abstract
The practical realization of circular economy (CE) requires a thorough consideration of the key principles of CE which should be integrated to achieve systemic circularity. Content analysis of existing literature of CE applications in the construction industry (CI) revealed that none of the drivers, indicators, and methods of eco-efficient and eco-effective principles of CE could alone lead the CI towards systemic circularity and sustainable development. The challenges and potential solutions of integrating the drivers, indicators and methods of both principles were studied and gauge against the key-value propositions of CE. As a result, guidelines for designing for systemic circularity along the four building blocks of CE were proposed for the CI. Also, considering the key performance indicators, methods and impact categories of both principles, a novel life cycle assessment-cradle-to-cradle-predictive building systemic circularity indicator (LCA-C2C–PBSCI) was suggested to enhance the assessment of impact potentials and recovery potentials of buildings along product lifecycles. This study makes a distinctive contribution to knowledge as it does not only propose guidelines to enhance the reusability and value retainability of products designed for systemic circularity, but also suggest a novel method for CE evaluation which seeks to enlarge the system boundaries of assessments to understanding the implications of production systems decisions across the environmental, technical, social, and economic dimensions. The practical application of the guidelines and the novel method of this study have been presented, but it would require experts' judgement and real case examples to enhance it reproducibility and validity. [Display omitted] • We identified the drivers and methods of eco-efficient and eco-effective principles. • The challenges and solutions of integrating the drivers and methods were presented. • Guidelines for designing for systemic circularity were modeled based on the drivers. • A LCA-C2C–PBSCI method for assessing the circularity of buildings was proposed. [ABSTRACT FROM AUTHOR]
- Published
- 2022
- Full Text
- View/download PDF
33. Arquitetura e território em Simbiose
- Author
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Martins, José Miguel Esteves, Mateus, Nuno Miguel Feio Ribeiro, and Gama, Miguel, coorientador
- Subjects
Alcântara Valley ,Eco-eficiente ,Vale de Alcântara ,Sustainability ,Urban Park ,Green architecture ,Eco-efficient ,Parque urbano ,Sustentabilidade ,Arquitetura sustentável - Abstract
Dissertação de Mestrado Integrado em Arquitetura, com a especialização em Arquitetursa apresentada na Faculdade de Arquitetura da Universidade de Lisboa para obtenção do grau de Mestre. O projeto insere-se no contexto do paradigma da arquitetura contemporânea, em que face às alterações climáticas a sustentabilidade é o principal motor de projeto. Partindo do caso do Vale de Alcântara, o projeto urbano e arquitetónico fundem-se numa simbiose com o território, procurando tirar partido da sua génese natural. Através de um parque urbano é criado um novo corredor verde na cidade que pretende dialogar com o sistema natural da cidade, fazendo parte de uma visão holística que começa na arquitetura sustentável, passa pelo urbanismo verde e culmina num impacto à escala global. O presente documento propõe como as dimensões da sustentabilidade podem guiar as escolhas de projeto. A proposta pretende investigar como o uso de materiais reciclados e ecoeficientes potenciam uma arquitetura mais consciente, mas igualmente bela e funcional. O projeto final de mestrado propõe argumentar a tese de que o urbanismo e a arquitetura sustentável podem melhorar a qualidade de vida. ABSTRACT: From a new perspective of the contemporany architecture paradigm, the presented project elucidates how sustainability works against climate change and could be the main approach in an architecture project. Taking the case of Alcântara valley, in Lisbon, the project searches for the symbiosis between architecture, urbanism and the territory in which is inserted. The urban plan is composed by an urban park that works as a green corridor, making part of the natural system of the city. This change in the territory makes part of an holistic way of mitigate climate change. The present document shoes how the dimentions of sustainability could guide an architeture project. The proposal pretends to investigate how the use of reclycled and eco-efficient materials can create a more sober architeture, while being equaly functional and beautifull as ever was. This thesis pretends to argue how green architecture and urbanism help to incrise the quality of life. N/A
- Published
- 2020
34. Product-services as a research field: past, present and future. Reflections from a decade of research
- Author
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Tukker, Arnold and Tischner, Ursula
- Subjects
- *
PRODUCT management , *MARKETING management , *BUSINESS logistics - Abstract
Abstract: In the last decade many researchers, institutes and programs in the EU paid attention to product-service systems (PSS). Given this massive effort, it is time to take stock. Is PSS research a theoretical field in its own right? Is the PSS concept indeed the road to the Factor 10 world? Is it the road to enhanced competitiveness? What is needed to really use the potential of the concept? This paper discusses these questions summarizing the analysis done in the PSS review book ‘New Business for Old Europe’, various EU sponsored projects and the conceptual approach chosen in a new research network on Sustainable Consumption and Production, called SCORE! [Copyright &y& Elsevier]
- Published
- 2006
- Full Text
- View/download PDF
35. Toughness Behavior of SBR Acrylate Copolymer-Modified Pervious Concrete with Single-Sized Aggregates.
- Author
-
Zhao, Chaohua, Li, Hualin, Peng, Yi, Jia, Xiaoyao, and Rahman, Ali
- Subjects
- *
FRACTURE toughness testing , *LIGHTWEIGHT concrete , *ACRYLATES , *STYRENE-butadiene rubber , *ROAD construction , *FLEXURAL strength , *SILICA fume , *COMPRESSIVE strength - Abstract
Pervious concrete is an eco-efficient concrete but has problems regarding its mechanical performance and permeability balance. This research investigated the feasibility of using a combination of styrene–butadiene rubber (SBR) and acrylate polymer to improve the toughness of pervious concrete while keeping its permeability. Single-sized aggregate and no sand were considered in the concrete mixture. Acrylate polymers with different solid content, PH, density, and viscosity were emulsion copolymerized with an SBR polymer. Eleven scenarios with different mix proportions and 220 specimens for compressive strength, flexural strength, flexural stiffness, impact resistance, and fracture toughness tests were selected to evaluate the effects of the copolymer on the toughness of copolymer-modified pervious concrete (CMPC). The studies showed that (1) the influence trend of the copolymers generally varied according to different mechanical indexes; (2) XG–6001 acrylate polymer mainly and comprehensively enhanced the toughness of the CMPC; (3) it was difficult to increase the enhancing property of the XG–6001 acrylate polymer with the growth of its mix proportion; (4) the zero-sand pervious concrete with 90% SBR and 10% XG–6001 acrylate emulsion copolymerization proved to have relatively high toughness. The proposed CMPC holds promising application value in sustainability traffic road construction. [ABSTRACT FROM AUTHOR]
- Published
- 2021
- Full Text
- View/download PDF
36. Effective low-energy mixing procedure to develop high-fluidity cementitious pastes
- Author
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Aires Camões, Iman Ferdosian, and Universidade do Minho
- Subjects
Materials science ,Ultra-high performance concrete (UHPC) ,Self-compacting ,Eco-efficient ,0211 other engineering and technologies ,Mixing (process engineering) ,General Physics and Astronomy ,02 engineering and technology ,Superplasticizer ,Fluidity ,Low energy ,Addition time ,021105 building & construction ,Mixing method ,Concrete paste ,General Materials Science ,Composite material ,Science & Technology ,General Chemistry ,021001 nanoscience & nanotechnology ,Cementitious ,0210 nano-technology ,Flow time ,Workability - Abstract
Preparing a high fluidity paste is a major step in ultra-high performance concrete (UHPC) development with respect to its self-compacting ability as well as its ultra-high strength. In this regard, some experiments have been carried out in order to study various superplasticizer (SP) addition methods and times. Among these procedures, stepwise and delayed methods seem to be more efficient compared to direct addition of SP with or immediately after water addition. However, few studies regarding water addition time and method have been conducted since now. In this research work, the effects of water and SP addition methods on the fluidity of paste were investigated. The results demonstrated that stepwise and delayed water beside delayed SP addition remarkably reduce the flow time. This maximum fluidity was achieved after totally 15 minutes of mixing including 3 minutes after 70% of water addition to powder, as first-part water, 6 minutes after SP addition and finally an extra 6 minutes after second-part water which is 30% of the total water. Based on this procedure, the opportunity for developing self-compacting and durable UHPC could be accessible. Furthermore, using higher content of aggregates and supplementary cementitious materials would be possible due to higher fluidity of the paste which finally results in an eco-efficient UHPC.
- Published
- 2016
37. An eco-efficient and economical optimum evaluation technique for the forest road networks: the case of the mountainous forest of Metsovo, Greece
- Author
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Tampekis, Stergios, Samara, Fani, Sakellariou, Stavros, Sfougaris, Athanassios, and Christopoulou, Olga
- Published
- 2018
- Full Text
- View/download PDF
38. Propuesta de producto eco-eficiente como partición interior a base de yeso y pulpa de papel de periódico
- Author
-
Frustaglia, Diego César, Universidad de Sevilla. Departamento de Física Aplicada II, Durán Campos, Esther, Frustaglia, Diego César, Universidad de Sevilla. Departamento de Física Aplicada II, and Durán Campos, Esther
- Abstract
El presente trabajo trata del estudio de materiales eco-eficientes, aprovechando los residuos generados por el hombre, y su posible aplicación en el mundo de la construcción. Concretamente este estudio se centrará en el desarrollo de un nuevo material compuesto por un 5% de pulpa de papel de periódico y un 95% de yeso. Este se analizará mecánica y acústicamente, para ver el comportamiento que presenta, y comprobar su aplicación constructiva de forma justificada. Se realizan los ensayos, tanto para comprobar la capacidad resistente del material, a flexión y a compresión, como para obtener la impedancia acústica de él, a través del tubo de Kundt, y justificar su aplicación como revestimiento interior en diferentes situaciones., This essay deals with the study of eco-efficient materials, which take the waste generated by men and its application in the world of construction. Specifically, this study focuses on the development of a new material. One that is composed in 5% out of newspaper pulp and 95% of gypsum. This will be analyzed both mechanically and acoustically to verify its constructive application. Tests are carried out to check the material’s resistance, flexion and compression. This, in order to not only obtain the correct acoustic impedance through the Kundt tube, but to also justify its application as an internal partition in different scenarios.
- Published
- 2018
39. Propuesta de producto eco-eficiente como partición interior a base de yeso y pulpa de papel de periódico
- Author
-
Durán Campos, Esther, Frustaglia, Diego César, and Universidad de Sevilla. Departamento de Física Aplicada II
- Subjects
ensayos ,eco-eficiencia ,eco-efficient ,Newspaper pulp ,tests ,Pulpa de papel de periódico ,yeso ,gypsum - Abstract
El presente trabajo trata del estudio de materiales eco-eficientes, aprovechando los residuos generados por el hombre, y su posible aplicación en el mundo de la construcción. Concretamente este estudio se centrará en el desarrollo de un nuevo material compuesto por un 5% de pulpa de papel de periódico y un 95% de yeso. Este se analizará mecánica y acústicamente, para ver el comportamiento que presenta, y comprobar su aplicación constructiva de forma justificada. Se realizan los ensayos, tanto para comprobar la capacidad resistente del material, a flexión y a compresión, como para obtener la impedancia acústica de él, a través del tubo de Kundt, y justificar su aplicación como revestimiento interior en diferentes situaciones. This essay deals with the study of eco-efficient materials, which take the waste generated by men and its application in the world of construction. Specifically, this study focuses on the development of a new material. One that is composed in 5% out of newspaper pulp and 95% of gypsum. This will be analyzed both mechanically and acoustically to verify its constructive application. Tests are carried out to check the material’s resistance, flexion and compression. This, in order to not only obtain the correct acoustic impedance through the Kundt tube, but to also justify its application as an internal partition in different scenarios. Universidad de Sevilla. Grado en Fundamentos de Arquitectura
- Published
- 2018
40. The use of structural eco-efficient mortars. A critical review from a SWOT analysis.
- Author
-
González Kunz, Rocío and González Kunz, Rocío
- Abstract
Producción Científica, One of the main climate trigger are CO2 emissions. In the field of architecture and construction, one of the most harmful materials is the cement due to its employment and its polluting power (about 5 and 8% of the worldwide CO2 emissions). Thus, the search of an alternative material is essential. This paper shows the possibility of using eco-efficient mortars as structural materials, in order to guarantee both safety and environment preservation in the strengthening / refurbishment / retrofitting of structures. In those mortars, the binder can be substituted by organic or inorganic materials (e.g. fly ash, ground granulated blast furnace slag, rice husk ash, palm oil fuel ash). From this strategy, the waste reduction is promoted, as wastes are immobilised without polluting the environment essential. Thus, it is encouraged the re-use of architecture which is an essential factor to get a more sustainable habitat. The obtained results allow setting a guide that makes easier the selection of eco-efficient mortars (guaranteeing both structural safety and environment preservation) to the agents involved in processes of structural works., Uno de los principales detonantes del cambio climático son las emisiones de CO2. En el ámbito de la arquitectura y la construcción, uno de los materiales más perjudiciales en relación a su uso y su poder contaminante es el cemento (entre el 5 y 8% de las emisiones de CO2 en el mundo son generadas por éste). Por tanto, es fundamental buscar alternativas a su uso. Esta investigación muestra la posibilidad del uso de morteros eco-eficientes como materiales estructurales que garanticen tanto la seguridad de la construcción como la preservación del medioambiente en intervenciones de refuerzo/ rehabilitación/consolidación estructural. En estos morteros, el conglomerante o bien es un material distinto al cemento o se realiza la sustitución de parte de éste por materiales orgánicos o inorgánicos como cenizas volantes, residuos de altos hornos, cáscaras de arroz, cenizas de aceite de palma, entre otros, con lo que también se propiciaría la reducción de residuos que pasarían a inmovilizarse sin contaminar la naturaleza. Así, se fomenta el reciclaje de la arquitectura, siendo éste un factor clave para un hábitat sostenible. Los resultados obtenidos permiten establecer una guía que facilite a los agentes implicados en las actuaciones de intervención estructural la selección de morteros eco-eficientes óptimos, tanto para garantizar la seguridad como para preservar el medioambiente.
- Published
- 2017
41. Approach to the regulation in spain for sustain-able constructions and eco-efficient solutions
- Author
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Mercader-Moyano, Pilar, Castilla Guerra, Jerónimo, Agudo Martínez, Andrés, Mercader-Moyano, Pilar, Castilla Guerra, Jerónimo, and Agudo Martínez, Andrés
- Abstract
Is there any law related to sustainable buildings and eco-efficient solutions in Spain? How harmful effects on the environment caused by the building industry are regulated? The emergence of concepts such as sustainability or eco-efficiency in the mid-twentieth century has caused a deep impact in the building industry, changing traditional techniques, systems and procedures that have promoted research for the use of materials more efficient. All aimed at lessening the harmful effects on the environment. In order to have a better comprehension of the impact caused by the regulation in the construction model we have prepared a comprehensive inventory of the existing regulations in Europe, Spain and Andalusia on sustainable buildings and ecoefficient solutions. All of this allows us to shape the current legal framework and its impact on the eco-efficient building model with the prospect of advancing in the achievement of sustainability objectives and therefore it is crucial to have a fair regulation on this field, adapted to the progress and in the same line with the sustainability objectives established in the European framework, ¿Existen normas vinculadas a la construcción sostenible y las soluciones ecoeficientes en España? ¿Cómo se regulan los efectos perjudiciales sobre el medio ambiente provocados por el sector de la construcción? La aparición de los conceptos de sostenibilidad y eco-eficiencia a mediados del siglo XX ha supuesto la modificación de hábitos dentro del ámbito de la construcción, regenerando técnicas constructivas, sistemas constructivos y procedimientos que han fomentado la investigación para el uso de materiales más eficientes. Todo ello orientado a aminorar los efectos perjudiciales sobre el medio ambiente. A efectos de una mejor comprensión del impacto normativo en el modelo constructivo hemos elaborado un detallado inventario de las normas aplicables en Europa, España y en Andalucía relativas a las construcciones sostenibles y las soluciones eco-eficientes. Todo ello nos permite perfilar el actual marco normativo y su impacto en modelo constructivo actual de construcciones sostenibles y soluciones Eco-Eficientes, ante la perspectiva de avanzar en la consecución de objetivos de sostenibilidad para lo cual es necesario contar con una regulación legal justa de esta materia, adaptada a los avances y en efectiva consonancia con los planteamientos de sostenibilidad que se establecen en el marco europeo
- Published
- 2017
42. The use of structural eco-efficient mortars. A critical review from a SWOT analysis
- Author
-
Mercader-Moyano, Pilar, Universidad de Sevilla. Departamento de Estructuras de Edificación e Ingeniería del terreno, Universidad de Sevilla. Departamento de Construcciones Arquitectónicas I (ETSA), Universidad de Sevilla. HUM965: Transhumancias : Arquitectura, Tecnología, Ciencia y Arte, González Kunz, Rocío Nieves, Pineda Palomo, Paloma, Brás, Ana, Morillas, Leandro, Mercader-Moyano, Pilar, Universidad de Sevilla. Departamento de Estructuras de Edificación e Ingeniería del terreno, Universidad de Sevilla. Departamento de Construcciones Arquitectónicas I (ETSA), Universidad de Sevilla. HUM965: Transhumancias : Arquitectura, Tecnología, Ciencia y Arte, González Kunz, Rocío Nieves, Pineda Palomo, Paloma, Brás, Ana, and Morillas, Leandro
- Abstract
One of the main climate trigger are CO2 emissions. In the field of architecture and construction, one of the most harmful materials is the cement due to its employment and its polluting power (about 5 and 8% of the worldwide CO2 emissions). Thus, the search of an alternative material is essential. This paper shows the possibility of using eco-efficient mortars as structural materials, in order to guarantee both safety and environment preservation in the strengthening/refurbishment/retrofitting of structures. In those mortars, the binder can be substituted by organic or inorganic materials (e.g. fly ash, ground granulated blast furnace slag, rice husk ash, palm oil fuel ash). From this strategy, the waste reduction is promoted, as wastes are immobilised without polluting the environment essential. Thus, it is encouraged the re-use of architecture which is an essential factor to get a more sustainable habitat. The obtained results allow setting a guide that makes easier the selection of eco-efficient mortars (guaranteeing both structural safety and environment preservation) to the agents involved in processes of structural works., Uno de los principales detonantes del cambio climático son las emisiones de CO2. En el ámbito de la arquitectura y la construcción, uno de los materiales más perjudiciales en relación a su uso y su poder contaminante es el cemento (entre el 5 y 8% de las emisiones de CO2 en el mundo son generadas por éste). Por tanto, es fundamental buscar alternativas a su uso. Esta investigación muestra la posibilidad del uso de morteros eco-eficientes como materiales estructurales que garanticen tanto la seguridad de la construcción como la preservación del medioambiente en intervenciones de refuerzo/ rehabilitación/consolidación estructural. En estos morteros, el conglomerante o bien es un material distinto al cemento o se realiza la sustitución de parte de éste por materiales orgánicos o inorgánicos como cenizas volantes, residuos de altos hornos, cáscaras de arroz, cenizas de aceite de palma, entre otros, con lo que también se propiciaría la reducción de residuos que pasarían a inmovilizarse sin contaminar la naturaleza. Así, se fomenta el reciclaje de la arquitectura, siendo éste un factor clave para un hábitat sostenible. Los resultados obtenidos permiten establecer una guía que facilite a los agentes implicados en las actuaciones de intervención estructural la selección de morteros eco-eficientes óptimos, tanto para garantizar la seguridad como para preservar el medioambiente.
- Published
- 2017
43. Research on eco-efficient structural mortars
- Author
-
Tejedor Cabrera, Antonio, Molina Huelva, Marta, Universidad de Sevilla. Departamento de Mecánica de Medios Contínuos y Teoría de Estructuras, Universidad de Sevilla: HUM965: Transhumancias : Arquitectura, Tecnología, Ciencia y Arte, Gonzalez-Kunz, Rocío N., Pineda Palomo, Paloma, Morillas, Leandro, Brás, Ana, Tejedor Cabrera, Antonio, Molina Huelva, Marta, Universidad de Sevilla. Departamento de Mecánica de Medios Contínuos y Teoría de Estructuras, Universidad de Sevilla: HUM965: Transhumancias : Arquitectura, Tecnología, Ciencia y Arte, Gonzalez-Kunz, Rocío N., Pineda Palomo, Paloma, Morillas, Leandro, and Brás, Ana
- Abstract
The main research goal is proving the possibility of using eco-efficient mortars as structural materials, to guarantee both safety and environment preservation in the strengthening/refurbishment/retrofitting of structures. After a comprehensive review on ecoefficient mortars, mechanical properties, rheological behaviour, setting times, durability, and environmental impact (GWP and EE) were analysed. Thus, a qualitative comparison between result obtained and OPC reference cement mortar was possible. Research is completed with an experimental characterisation of ashes, and mechanical test of mortar/concrete samples with plant biomass ashes. The research aims to demonstrate the feasibility and potential of plant biomass ashes in cement-based building materials. The performance from those mortars must be studied with static and dynamic loads as well as the resulting CO2 emission reduction. Finally, this research will propose a protocol selection of eco-efficient mortars based on an analytical hierarchy process (AHP)-based assessment method., Resumen: capacidades mecánicas suficientes para ser usados en refuerzos estructurales y que den resultados aceptables desde un punto de vista mecánico, económico y medioambiental. Tras realizar una exhaustiva revisión bibliográfica , se analizan las propiedades mecánicas, el comportamiento reológico, tiempo de fraguado, durabilidad e impacto medioambiental (GWP y EE), lo que permite realizar una comparativa cualitativa entre los resultados obtenidos y el mortero de cemento Portland de referencia. La investigación se completa con ensayos mecánicos realizados a morteros de cemento con sustitutivos de cenizas de biomasa vegetal obtenidas de plantas de producción de energía, las cuales han sido previamente caracterizadas. Con el desarrollo de la investigación se espera demostrar la viabilidad del uso de cenizas de biomasa vegetal como sustitutivo parcial del cemento con valores de resistencias suficientes, analizando el desempeño de estos morteros eco-eficientes desde la seguridad estructural, bajo cargas estáticas y dinámicas, acompañado del análisis de beneficios medioambientales para la reducción de las emisiones de CO2. Como objetivo final, se espera concluir con la elaboración de un protocolo de selección de dichos morteros eco-eficientes empleando el método de jerarquías analíticas (AHP).
- Published
- 2017
44. Aproximación a la regulación en España de construcciones sostenibles y soluciones eco-eficientes
- Author
-
Castilla Guerra, Jerónimo, Agudo Martínez, Andrés, Mercader-Moyano, Pilar (Coordinador), and Mercader-Moyano, Pilar
- Subjects
Legislation ,Eco-Efficient ,Building ,Construcción ,Sostenible ,Sustainable ,Ambiental ,Environmental ,Lesgislación - Abstract
Is there any law related to sustainable buildings and eco-efficient solutions in Spain? How harmful effects on the environment caused by the building industry are regulated? The emergence of concepts such as sustainability or eco-efficiency in the mid-twentieth century has caused a deep impact in the building industry, changing traditional techniques, systems and procedures that have promoted research for the use of materials more efficient. All aimed at lessening the harmful effects on the environment. In order to have a better comprehension of the impact caused by the regulation in the construction model we have prepared a comprehensive inventory of the existing regulations in Europe, Spain and Andalusia on sustainable buildings and ecoefficient solutions. All of this allows us to shape the current legal framework and its impact on the eco-efficient building model with the prospect of advancing in the achievement of sustainability objectives and therefore it is crucial to have a fair regulation on this field, adapted to the progress and in the same line with the sustainability objectives established in the European framework ¿Existen normas vinculadas a la construcción sostenible y las soluciones ecoeficientes en España? ¿Cómo se regulan los efectos perjudiciales sobre el medio ambiente provocados por el sector de la construcción? La aparición de los conceptos de sostenibilidad y eco-eficiencia a mediados del siglo XX ha supuesto la modificación de hábitos dentro del ámbito de la construcción, regenerando técnicas constructivas, sistemas constructivos y procedimientos que han fomentado la investigación para el uso de materiales más eficientes. Todo ello orientado a aminorar los efectos perjudiciales sobre el medio ambiente. A efectos de una mejor comprensión del impacto normativo en el modelo constructivo hemos elaborado un detallado inventario de las normas aplicables en Europa, España y en Andalucía relativas a las construcciones sostenibles y las soluciones eco-eficientes. Todo ello nos permite perfilar el actual marco normativo y su impacto en modelo constructivo actual de construcciones sostenibles y soluciones Eco-Eficientes, ante la perspectiva de avanzar en la consecución de objetivos de sostenibilidad para lo cual es necesario contar con una regulación legal justa de esta materia, adaptada a los avances y en efectiva consonancia con los planteamientos de sostenibilidad que se establecen en el marco europeo
- Published
- 2017
45. High-volume Fly Ash Paste for Developing Ultra-high Performance Concrete (UHPC)
- Author
-
Manuel J. Ribeiro, Aires Camões, Iman Ferdosian, and Universidade do Minho
- Subjects
Materials science ,Silica fume ,silica fume ,Eco-efficient ,0211 other engineering and technologies ,self-compacting ,020101 civil engineering ,02 engineering and technology ,Industrial and Manufacturing Engineering ,0201 civil engineering ,ultra-fine fly ash ,021105 building & construction ,General Materials Science ,Composite material ,Metakaolin ,Cement ,Science & Technology ,Renewable Energy, Sustainability and the Environment ,Ultra high performance concrete (UHPC) ,Pozzolan ,Durability ,Compressive strength ,Fly ash ,Particle size - Abstract
Ultra-high performance concrete is a kind of high-tech composite material which shows superb characteristics such as self- compactness, compressive strength higher than 150 MPa, and exceptional durability performances compared to other kinds of concrete. In this research, compared to known commercially available UHPCs, a type of UHPC paste with greener pozzolans was developed. In this regard, cement and silica fume, as two main constituents of the prevalent UHPC compositions and particularly with high cost and environmental impacts, were replaced by fly ash as a waste material. It was found that the highest fluidity and strength could be achieved with 13% and 16% of fly ash substitution, respectively. Furthermore, ultra-fine fly ash with mean particle size of 4.48 ?m showed its applicability to be used in UHPC with 20 wt.% cement substitution resulting in a paste with 153 MPa compressive strength and 37.5 cm flow diameter. Moreover, addition of at least 5% silica fume seems to be a prerequisite regarding strength gain of UHPC paste. Metakaolin as another pozzolanic material was studied. Although it improved the paste strength, it demonstrated lower fluidity and showed its inability to be applied in UHPC with required high workability., info:eu-repo/semantics/publishedVersion
- Published
- 2017
46. Empleo de morteros estructurales eco-eficientes. Revisión crítica desde un análisis DAFO
- Author
-
González Kunz, Rocío Nieves, Pineda Palomo, Paloma, Brás, Ana, Morillas, Leandro, Mercader-Moyano, Pilar (Coordinador), Mercader-Moyano, Pilar, Universidad de Sevilla. Departamento de Estructuras de Edificación e Ingeniería del terreno, and Universidad de Sevilla. HUM965: Transhumancias : Arquitectura, Tecnología, Ciencia y Arte
- Subjects
Refurbishment ,Mortar ,Eco-Eficiente ,Rehabilitación ,Refuerzo estructural ,Eco-Efficient ,Structural Retrofitting ,Mortero - Abstract
One of the main climate trigger are CO2 emissions. In the field of architecture and construction, one of the most harmful materials is the cement due to its employment and its polluting power (about 5 and 8% of the worldwide CO2 emissions). Thus, the search of an alternative material is essential. This paper shows the possibility of using eco-efficient mortars as structural materials, in order to guarantee both safety and environment preservation in the strengthening/refurbishment/retrofitting of structures. In those mortars, the binder can be substituted by organic or inorganic materials (e.g. fly ash, ground granulated blast furnace slag, rice husk ash, palm oil fuel ash). From this strategy, the waste reduction is promoted, as wastes are immobilised without polluting the environment essential. Thus, it is encouraged the re-use of architecture which is an essential factor to get a more sustainable habitat. The obtained results allow setting a guide that makes easier the selection of eco-efficient mortars (guaranteeing both structural safety and environment preservation) to the agents involved in processes of structural works. Uno de los principales detonantes del cambio climático son las emisiones de CO2. En el ámbito de la arquitectura y la construcción, uno de los materiales más perjudiciales en relación a su uso y su poder contaminante es el cemento (entre el 5 y 8% de las emisiones de CO2 en el mundo son generadas por éste). Por tanto, es fundamental buscar alternativas a su uso. Esta investigación muestra la posibilidad del uso de morteros eco-eficientes como materiales estructurales que garanticen tanto la seguridad de la construcción como la preservación del medioambiente en intervenciones de refuerzo/ rehabilitación/consolidación estructural. En estos morteros, el conglomerante o bien es un material distinto al cemento o se realiza la sustitución de parte de éste por materiales orgánicos o inorgánicos como cenizas volantes, residuos de altos hornos, cáscaras de arroz, cenizas de aceite de palma, entre otros, con lo que también se propiciaría la reducción de residuos que pasarían a inmovilizarse sin contaminar la naturaleza. Así, se fomenta el reciclaje de la arquitectura, siendo éste un factor clave para un hábitat sostenible. Los resultados obtenidos permiten establecer una guía que facilite a los agentes implicados en las actuaciones de intervención estructural la selección de morteros eco-eficientes óptimos, tanto para garantizar la seguridad como para preservar el medioambiente.
- Published
- 2017
47. Eco-efficient ultra-high performance concrete development by means of response surface methodology
- Author
-
Aires Camões, Iman Ferdosian, and Universidade do Minho
- Subjects
Materials science ,Silica fume ,Eco-efficient ,Self-compacting ,0211 other engineering and technologies ,02 engineering and technology ,Short-fiber composite ,021105 building & construction ,General Materials Science ,Response surface methodology ,Composite material ,Cement ,Science & Technology ,business.industry ,Building and Construction ,Structural engineering ,Statistical mixture design ,021001 nanoscience & nanotechnology ,Ultra-fine fly ash ,Compressive strength ,Fly ash ,Cost efficient ,Ultra high performance ,0210 nano-technology ,business - Abstract
The research described in this paper represents a statistically based model with the help of response surface methodology (RSM) aiming to study the applicability of this method to ultra-high performance concrete (UHPC) mixture design and its optimization. Besides, the effects of silica fume, ultra-fine fly ash (UFFA) and sand as three main variable constituents of UHPC on workability and compressive strength as the main performance criteria and responses of this high-tech material were investigated. The models proposed here demonstrate a perfect correlation among variables and responses. Furthermore, through performing a multi-objective optimization, cement and silica fume, as two main constituents of UHPC affecting its eco-efficiency and cost, were substituted by UFFA and sand as much as possible. Finally, an eco-efficient UHPC with cement and silica fume content of 640 kg/m3 and 56.3 kg/m3 respectively and compressive strength and flow diameter of 160.3 MPa and 19 cm was developed., info:eu-repo/semantics/publishedVersion
- Published
- 2017
48. 3rd International Congress on Sustainable Construction and Eco-Efficient Solutions
- Author
-
González Kunz, Rocío, Pineda, Paloma, Bras, Ana, and Morillas Romero, Leandro
- Subjects
refurbishment ,structural retrofitting ,eco-efficient ,mortar - Abstract
Producción Científica One of the main climate trigger are CO2 emissions. In the field of architecture and construction, one of the most harmful materials is the cement due to its employment and its polluting power (about 5 and 8% of the worldwide CO2 emissions). Thus, the search of an alternative material is essential. This paper shows the possibility of using eco-efficient mortars as structural materials, in order to guarantee both safety and environment preservation in the strengthening / refurbishment / retrofitting of structures. In those mortars, the binder can be substituted by organic or inorganic materials (e.g. fly ash, ground granulated blast furnace slag, rice husk ash, palm oil fuel ash). From this strategy, the waste reduction is promoted, as wastes are immobilised without polluting the environment essential. Thus, it is encouraged the re-use of architecture which is an essential factor to get a more sustainable habitat. The obtained results allow setting a guide that makes easier the selection of eco-efficient mortars (guaranteeing both structural safety and environment preservation) to the agents involved in processes of structural works. Uno de los principales detonantes del cambio climático son las emisiones de CO2. En el ámbito de la arquitectura y la construcción, uno de los materiales más perjudiciales en relación a su uso y su poder contaminante es el cemento (entre el 5 y 8% de las emisiones de CO2 en el mundo son generadas por éste). Por tanto, es fundamental buscar alternativas a su uso. Esta investigación muestra la posibilidad del uso de morteros eco-eficientes como materiales estructurales que garanticen tanto la seguridad de la construcción como la preservación del medioambiente en intervenciones de refuerzo/ rehabilitación/consolidación estructural. En estos morteros, el conglomerante o bien es un material distinto al cemento o se realiza la sustitución de parte de éste por materiales orgánicos o inorgánicos como cenizas volantes, residuos de altos hornos, cáscaras de arroz, cenizas de aceite de palma, entre otros, con lo que también se propiciaría la reducción de residuos que pasarían a inmovilizarse sin contaminar la naturaleza. Así, se fomenta el reciclaje de la arquitectura, siendo éste un factor clave para un hábitat sostenible. Los resultados obtenidos permiten establecer una guía que facilite a los agentes implicados en las actuaciones de intervención estructural la selección de morteros eco-eficientes óptimos, tanto para garantizar la seguridad como para preservar el medioambiente.
- Published
- 2017
49. Research on eco-efficient structural mortars
- Author
-
Gonzalez-Kunz, Rocío N., Pineda Palomo, Paloma, Morillas, Leandro, Brás, Ana, Tejedor Cabrera, Antonio (Coordinador), Molina Huelva, Marta (Coordinador), Tejedor Cabrera, Antonio, Molina Huelva, Marta, Universidad de Sevilla. Departamento de Mecánica de Medios Contínuos y Teoría de Estructuras, and Universidad de Sevilla: HUM965: Transhumancias : Arquitectura, Tecnología, Ciencia y Arte
- Subjects
cenizas de biomasa ,eco-eficiente ,eco-efficient ,Structural mortar ,biomass ashes ,Mortero estructural - Abstract
The main research goal is proving the possibility of using eco-efficient mortars as structural materials, to guarantee both safety and environment preservation in the strengthening/refurbishment/retrofitting of structures. After a comprehensive review on ecoefficient mortars, mechanical properties, rheological behaviour, setting times, durability, and environmental impact (GWP and EE) were analysed. Thus, a qualitative comparison between result obtained and OPC reference cement mortar was possible. Research is completed with an experimental characterisation of ashes, and mechanical test of mortar/concrete samples with plant biomass ashes. The research aims to demonstrate the feasibility and potential of plant biomass ashes in cement-based building materials. The performance from those mortars must be studied with static and dynamic loads as well as the resulting CO2 emission reduction. Finally, this research will propose a protocol selection of eco-efficient mortars based on an analytical hierarchy process (AHP)-based assessment method. Resumen: capacidades mecánicas suficientes para ser usados en refuerzos estructurales y que den resultados aceptables desde un punto de vista mecánico, económico y medioambiental. Tras realizar una exhaustiva revisión bibliográfica , se analizan las propiedades mecánicas, el comportamiento reológico, tiempo de fraguado, durabilidad e impacto medioambiental (GWP y EE), lo que permite realizar una comparativa cualitativa entre los resultados obtenidos y el mortero de cemento Portland de referencia. La investigación se completa con ensayos mecánicos realizados a morteros de cemento con sustitutivos de cenizas de biomasa vegetal obtenidas de plantas de producción de energía, las cuales han sido previamente caracterizadas. Con el desarrollo de la investigación se espera demostrar la viabilidad del uso de cenizas de biomasa vegetal como sustitutivo parcial del cemento con valores de resistencias suficientes, analizando el desempeño de estos morteros eco-eficientes desde la seguridad estructural, bajo cargas estáticas y dinámicas, acompañado del análisis de beneficios medioambientales para la reducción de las emisiones de CO2. Como objetivo final, se espera concluir con la elaboración de un protocolo de selección de dichos morteros eco-eficientes empleando el método de jerarquías analíticas (AHP).
- Published
- 2017
50. Sustainable construction through eco-efficient ultra-high performance concrete
- Author
-
Aires Camões, Iman Ferdosian, and Universidade do Minho
- Subjects
Engineering ,business.industry ,Eco-efficient ,0211 other engineering and technologies ,020101 civil engineering ,02 engineering and technology ,Energy consumption ,7. Clean energy ,Civil engineering ,Durability ,0201 civil engineering ,Prefabrication ,Ultra-high performance concrete ,Sustainable construction ,Compressive strength ,Engenharia e Tecnologia::Engenharia Civil ,Precast concrete ,021105 building & construction ,11. Sustainability ,Ultra high performance ,business ,Curing (chemistry) - Abstract
An innovative type of steel-fibre reinforced ultra-high performance concrete (UHPC), including its constituent materials and its mixing procedure, is reviewed in this paper. Furthermore, an energy-efficient curing method for developing precast UHPC members is presented as the main goal of the current study. It was found that just with 24 hours of curing in tempered water or steam with 67°C, 95% of 28-day compressive strength in normal curing method, 145 MPa, could be achieved which would be of great interest for prefabrication industry regarding their energy consumption. It also would be beneficial for any project in which early load-bearing capacity is expected. Self-compactness, compressive strength higher than 150 MPa, improved durability and finally low curing energy in precasting phase of the material all offer variety of slim interior and exterior architectural and structural applications even in high-rise structures and aggressive environments where higher strength, ductility and durability is required., (undefined)
- Published
- 2016
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