45 results on '"Di Maio, Luciano"'
Search Results
2. Development of PBS/Nano Composite PHB-Based Multilayer Blown Films with Enhanced Properties for Food Packaging Applications.
- Author
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Palmieri, Francesco, Tagoe, Joseph Nii Ayi, and Di Maio, Luciano
- Subjects
FOOD packaging ,EDIBLE coatings ,BIODEGRADABLE plastics ,WATER vapor ,OXYGEN in water ,POLYHYDROXYBUTYRATE - Abstract
Biobased and biodegradable plastics have emerged as promising alternatives to conventional plastics offering the potential to reduce environmental impacts while promoting sustainability. This study focuses on the production of multilayer blown films with enhanced functional properties suitable for food packaging applications. Films were developed through co-extrusion in a three-layer film configuration, with Polybutylene Succinate (PBS) and Polybutylene Succinate Adipate (PBSA) as the external and internal layers, respectively. The functional layer consisted of Polyhydroxybutyrate (PHB) enhanced with nanoclays Cloisite
® 30B at varying weight ratios. Films were also processed by manipulating the extruder screw speed of the functional layer to investigate its impact on the functional properties. Rheology, mechanical strength, and barrier performance were characterised to establish correlations between processing conditions and functional layer blends (Cloisite® 30B/PHB) on the properties of the resultant films. Rheological test results indicated that the system with 5% Cloisite® had the best polymer/nanofiller matrix dispersion. Mechanical and permeability tests showed that by varying the process conditions (the alteration of the thickness of the functionalized layer) resulted in an improvement in mechanical and barrier properties. Furthermore, the addition of the nanofiller resulted in a stiffening of the film with a subsequent decrease in permeability to oxygen and water vapour. [ABSTRACT FROM AUTHOR]- Published
- 2024
- Full Text
- View/download PDF
3. Cellulose/Polyhydroxybutyrate (PHB) Composites as a Sustainable Bio-Based Feedstock to 3D-Printing Applications.
- Author
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D'Arienzo, Lucia, Acierno, Stefano, Patti, Antonella, and Di Maio, Luciano
- Subjects
POLYHYDROXYBUTYRATE ,POLY-beta-hydroxybutyrate ,CELLULOSE ,CELLULOSE fibers ,DYNAMIC mechanical analysis ,DIFFERENTIAL scanning calorimetry ,FEEDSTOCK ,THERMOGRAVIMETRY - Abstract
In this work, we have studied the potential application for 3D-printing of a polymer made from combining a biodegradable and biocompatible polymer (i.e., polyhydroxybutyrate, PHB) with natural bio-based fiber (i.e., cellulose). To this end, a masterbatch at 15 wt.% in filler content was prepared by melt-blending, and then this system was "diluted" with pure PHB in a second extrusion phase in order to produce filaments at 1.5 and 3 wt.% of cellulose. For comparison, a filament made of 100% virgin PHB pellets was prepared under the same conditions. All the systems were then processed in the 3D-printer apparatus, and specimens were mainly characterized by static (tensile and flexural testing) and dynamic mechanical analysis. Thermogravimetric analysis, differential scanning calorimetry, spectroscopic measurements, and morphological aspects of PHB polymer and composites were also discussed. The results showed a significant negative impact of the process on the mechanical properties of the basic PHB with a reduction in both tensile and flexural mechanical properties. The PHB–cellulose composites showed a good dispersion filler in the matrix but a poor interfacial adhesion between the two phases. Furthermore, the cellulose had no effect on the melting behavior and the crystallinity of the polymer. The addition of cellulose improved the thermal stability of the polymer and minimized the negative impact of extrusion. The mechanical performance of the composites was found to be higher compared to the corresponding (processed) polymer. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
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4. Assessment of Melt Compounding with Zeolites as an Effective Deodorization Strategy for Mixed Plastic Wastes and Comparison with Degassing
- Author
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Garofalo, Emilia, primary, Taurino, Leonardo, additional, Di Maio, Luciano, additional, Neitzert, Heinz C., additional, and Incarnato, Loredana, additional
- Published
- 2023
- Full Text
- View/download PDF
5. New Materials and Technologies for Durability and Conservation of Building Heritage
- Author
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Coppola, Luigi, primary, Bellezze, Tiziano, additional, Belli, Alberto, additional, Bianco, Alessandra, additional, Blasi, Elisa, additional, Cappello, Miriam, additional, Caputo, Domenico, additional, Chougan, Mehdi, additional, Coffetti, Denny, additional, Coppola, Bartolomeo, additional, Corinaldesi, Valeria, additional, D’Amore, Alberto, additional, Daniele, Valeria, additional, Di Maio, Luciano, additional, Di Palma, Luca, additional, Donnini, Jacopo, additional, Ferrara, Giuseppe, additional, Filippi, Sara, additional, Gastaldi, Matteo, additional, Generosi, Nicola, additional, Giosuè, Chiara, additional, Incarnato, Loredana, additional, Lamastra, Francesca, additional, Liguori, Barbara, additional, Macera, Ludovico, additional, Maqbool, Qaisar, additional, Mascolo, Maria Cristina, additional, Mavilia, Letterio, additional, Mazzoli, Alida, additional, Medici, Franco, additional, Mobili, Alessandra, additional, Montesperelli, Giampiero, additional, Pia, Giorgio, additional, Redaelli, Elena, additional, Ruello, Maria Letizia, additional, Scarfato, Paola, additional, Taglieri, Giuliana, additional, Tittarelli, Francesca, additional, Tulliani, Jean-Marc, additional, and Valenza, Antonino, additional
- Published
- 2023
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6. Effect of BOPET film surface treatments on adhesion performance of biodegradable coatings for packaging applications
- Author
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Barbaro, Giovanni, Galdi, Maria Rosaria, Di Maio, Luciano, and Incarnato, Loredana
- Published
- 2015
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7. Use of Hazelnut Perisperm as an Antioxidant for Production of Sustainable Biodegradable Active Films
- Author
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Scarfato, Paola, primary, Graziano, Maria Luisa, additional, Pietrosanto, Arianna, additional, Di Maio, Luciano, additional, and Incarnato, Loredana, additional
- Published
- 2022
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8. Development of Novel Blown Shrink Films from Poly(Lactide)/Poly(Butylene-Adipate-co-Terephthalate) Blends for Sustainable Food Packaging Applications
- Author
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Pietrosanto, Arianna, primary, Apicella, Annalisa, additional, Scarfato, Paola, additional, Incarnato, Loredana, additional, and Di Maio, Luciano, additional
- Published
- 2022
- Full Text
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9. Effect of biaxial drawing on morphology and properties of copolyamide nanocomposites produced by film blowing
- Author
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Garofalo, Emilia, Fariello, Maria Letizia, Di Maio, Luciano, and Incarnato, Loredana
- Published
- 2013
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10. Nanosilicates in Compatibilized Mixed Recycled Polyolefins: Rheological Behavior and Film Production in a Circular Approach
- Author
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Garofalo, Emilia, primary, Di Maio, Luciano, additional, Scarfato, Paola, additional, Apicella, Annalisa, additional, Protopapa, Antonio, additional, and Incarnato, Loredana, additional
- Published
- 2021
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11. Zeolites as effective desiccants to solve hygroscopicity issue of post-consumer mixed recycled polyolefins
- Author
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Garofalo, Emilia, primary, Scarfato, Paola, additional, Di Maio, Luciano, additional, Protopapa, Antonio, additional, and Incarnato, Loredana, additional
- Published
- 2021
- Full Text
- View/download PDF
12. Study on Improving the Processability and Properties of Mixed Polyolefin Post-Consumer Plastics for Piping Applications
- Author
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Garofalo, Emilia, primary, Di Maio, Luciano, additional, Scarfato, Paola, additional, Pietrosanto, Arianna, additional, Protopapa, Antonio, additional, and Incarnato, Loredana, additional
- Published
- 2020
- Full Text
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13. Development of Eco-Sustainable PBAT-Based Blown Films and Performance Analysis for Food Packaging Applications
- Author
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Pietrosanto, Arianna, primary, Scarfato, Paola, additional, Di Maio, Luciano, additional, and Incarnato, Loredana, additional
- Published
- 2020
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14. Preparation and Characterization of Polypropylene/Carbon Nanotubes (PP/CNTs) Nanocomposites as Potential Strain Gauges for Structural Health Monitoring
- Author
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Coppola, Bartolomeo, primary, Di Maio, Luciano, additional, Incarnato, Loredana, additional, and Tulliani, Jean-Marc, additional
- Published
- 2020
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15. Evaluation of the Suitability of Poly(Lactide)/Poly(Butylene-Adipate-co-Terephthalate) Blown Films for Chilled and Frozen Food Packaging Applications
- Author
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Pietrosanto, Arianna, primary, Scarfato, Paola, additional, Di Maio, Luciano, additional, Nobile, Maria Rossella, additional, and Incarnato, Loredana, additional
- Published
- 2020
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16. Erratum: Effect of Porosity and Crystallinity on 3D Printed PLA Properties. Polymers 2019, 11, 1487
- Author
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Liao, Yuhan, primary, Liu, Chang, additional, Coppola, Bartolomeo, additional, Barra, Giuseppina, additional, Di Maio, Luciano, additional, Incarnato, Loredana, additional, and Lafdi, Khalid, additional
- Published
- 2020
- Full Text
- View/download PDF
17. Sustainable Active PET Films by Functionalization With Antimicrobial Bio-Coatings
- Author
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Apicella, Annalisa, primary, Scarfato, Paola, additional, Di Maio, Luciano, additional, and Incarnato, Loredana, additional
- Published
- 2019
- Full Text
- View/download PDF
18. Development of PLA / PHB Blown Films with Improved Performance for Food Packaging Applications.
- Author
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Pietrosanto, Arianna, Scarfato, Paola, Di Maio, Luciano, and Incarnato, Loredana
- Subjects
POLYLACTIC acid ,FOOD packaging ,GAMMA-hydroxybutyrate ,ELASTIC modulus ,POLYMERS - Abstract
In the present work, the suitability of Polylactic acid (PLA) / Poly-ß-hydroxybutyrate (PHB) blends for blown film extrusion was evaluated in a broad range of compositions, obtaining films with improved performance for food packaging applications. Blending PHB with PLA enhanced the processability of the systems for the film blowing process than neat PLA. Moreover, even though the polymers were found to be immiscible, the addition of PHB improved the crystallization of PLA, with a consequent increase in the stiffness, barrier properties and light-screening ability of the final developed systems. An increase in the ductility of the films was also achieved with a PHB content up to 30 wt.%. Correlations between the transparency and the crystallinity degree, and between the oxygen permeability and the elastic modulus of the films were also evaluated. [ABSTRACT FROM AUTHOR]
- Published
- 2021
- Full Text
- View/download PDF
19. Development of Recycled Blown Films Based on Post-Consumer Plastics Recovered from Seas And Rivers.
- Author
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Ferraioli, Raffaella, Di Maio, Luciano, Incarnato, Loredana, and Scarfato, Paola
- Subjects
FLEXIBLE packaging ,PLASTIC scrap ,MONTMORILLONITE ,ZEOLITES ,GRAFT copolymers - Abstract
Post-consumer flexible packaging abandoned in seas and rivers represent an important environmental problem: their recovery is still a challenge and the management of the recovered material is equally difficult since, due to their heterogenicity and to their long-time permanence in seas or rivers, these plastics present various issues related to high incompatibility, hygroscopicity and presence of bad smells. All this translates into poor processability and mechanical performance and low organoleptic quality. The aim of this work is to characterize the seas and rivers plastic waste (SRPW) composition and to perform a preliminary investigation on the effectiveness of two different mineral fillers as reinforcing and compatibilizing agents for SRPW, in view of possible second-life applications of this waste. In particular, an organo-modified montmorillonite (Dellite 67G) and a natural sodium zeolite mineral (Zeolite 4A), loaded at 5 wt%, were considered for improving the processability and properties of SRPW blown films. The combined use of a polymeric compatibilizer (polyolefin block copolymer grafted with 0.4 wt% maleic anhydride was also considered, in order both to improve the filler dispersion within the polymer and to compatibilize the main constituents of SRPW. The results demonstrated that the addition of both fillers to SRPW leaves essentially unchanged the thermal stability, but gives interesting improvements mainly in terms of stiffness. The effects are more significant when the nanometric Dellite 67G is added, than for the micrometric Zeolite 4A, especially in compatibilized systems. [ABSTRACT FROM AUTHOR]
- Published
- 2021
- Full Text
- View/download PDF
20. Natural Nanozeolite as Desiccant and Reinforcement Additive in Recycled Polymer Blends from Post-Consumer Flexible Packaging.
- Author
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Garofalo, Emilia, Scarfato, Paola, Di Maio, Luciano, Protopapa, Antonio, and Incarnato, Loredana
- Subjects
POLYMERS ,POLYOLEFINS ,NANOSTRUCTURED materials ,POLYPROPYLENE ,ZEOLITES - Abstract
This study concerned with the upgrading of a mixed polyolefin material, obtained by the sorting and mechanical recycling of flexible packaging of small size (< 0.125 m2). It is mainly composed of polyethylene and a minor amount of polypropylene, with traces of polar contaminants. These latter are responsible for material's hygroscopicity, which negatively affects its processability and final performances. In the present work, the recyclate was melt compounded with different amounts of a nanometric natural zeolite by means of a single-screw extruder. The idea was to take advantage of the potential double function of this additive, as desiccant and reinforcement. The neat recyclate and its blends with the nanozeolite were extruded in the form of ribbons that were submitted to tensile mechanical tests. Significant increases of both stiffness and strain at break were observed for the systems Fil-s/nanozeolite compared to the neat recyclate, due to an efficient drying and reinforcement action of the selected nanozeolite, despite the non-optimal dispersion of the nanofiller. [ABSTRACT FROM AUTHOR]
- Published
- 2021
- Full Text
- View/download PDF
21. Effect of Porosity and Crystallinity on 3D Printed PLA Properties
- Author
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Liao, Yuhan, primary, Liu, Chang, additional, Coppola, Bartolomeo, additional, Barra, Giuseppina, additional, Di Maio, Luciano, additional, Incarnato, Loredana, additional, and Lafdi, Khalid, additional
- Published
- 2019
- Full Text
- View/download PDF
22. Tensile strength of flax fabrics to be used as reinforcement in cement-based composites: experimental tests under different environmental exposures
- Author
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Ferrara, Giuseppe, primary, Coppola, Bartolomeo, additional, Di Maio, Luciano, additional, Incarnato, Loredana, additional, and Martinelli, Enzo, additional
- Published
- 2019
- Full Text
- View/download PDF
23. Nanotechnology-Based Strategy to Upgrade the Performances of Plastic Flexible Film Waste
- Author
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Garofalo, Emilia, primary, Di Maio, Luciano, additional, Scarfato, Paola, additional, Di Gregorio, Fabrizio, additional, and Incarnato, Loredana, additional
- Published
- 2019
- Full Text
- View/download PDF
24. 3D Printing of PLA/clay Nanocomposites: Influence of Printing Temperature on Printed Samples Properties
- Author
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Coppola, Bartolomeo, primary, Cappetti, Nicola, additional, Di Maio, Luciano, additional, Scarfato, Paola, additional, and Incarnato, Loredana, additional
- Published
- 2018
- Full Text
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25. Data on thermal conductivity, water vapour permeability and water absorption of a cementitious mortar containing end-of-waste plastic aggregates
- Author
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Di Maio, Luciano, primary, Coppola, Bartolomeo, additional, Courard, Luc, additional, Michel, Frédéric, additional, Incarnato, Loredana, additional, and Scarfato, Paola, additional
- Published
- 2018
- Full Text
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26. Morphology Development and Mechanical Properties Variation during Cold-Drawing of Polyethylene-Clay Nanocomposite Fibers
- Author
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Coppola, Bartolomeo, primary, Scarfato, Paola, additional, Incarnato, Loredana, additional, and Di Maio, Luciano, additional
- Published
- 2017
- Full Text
- View/download PDF
27. Structure and physical-mechanical properties related to comfort of flexible polyurethane foams for mattress and effects of artificial weathering
- Author
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Scarfato, Paola, primary, Di Maio, Luciano, additional, and Incarnato, Loredana, additional
- Published
- 2017
- Full Text
- View/download PDF
28. NIAS Exposure Assessment: Comparison of Different Tools.
- Author
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Pietrosanto, Arianna, Scarfato, Paola, Di Maio, Luciano, and Incarnato, Loredana
- Subjects
FOOD ,RISK assessment ,HEALTH ,FOOD consumption - Abstract
Food contact materials (FCMs) can contain Non-intentionally added substances (NIAS) as a result of break down, side product or impurities. NIAS can migrate into food and this might cause a risk for human health. Thus, their presence has to be evaluated, but currently there are no protocols to establish how to perform a risk assessment. Then, in this work, three different strategies to make a NIAS exposure assessment were compared: the European Food Agency Authority (EFSA) food consumption database, the Matrix Tool and the FACET tool. 2,4-Di-tert-butylphenol (2,4-DTB), an identified and quantified NIAS, was used as the case study. Differences between these tools were highlighted, but for all the strategies tested the estimated exposure to 2,4-DTB was lower than its threshold value indicating that there are no risk for the consumers. [ABSTRACT FROM AUTHOR]
- Published
- 2019
- Full Text
- View/download PDF
29. DURABILITY AND MECHANICAL PROPERTIES OF NANOCOPOSITE FIBER REINFORCED CONCRETE
- Author
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Coppola, Bartolomeo, Scarfato, Paola, Incarnato, Loredana, and DI MAIO, Luciano
- Subjects
nanocomposites ,concrete ,durability ,concrete, durability, polypropylene fibers, nanocomposites ,polypropylene fibers - Published
- 2014
30. Influence of a novel organo-silylated clay on the morphology, thermal and burning behavior of low density polyethylene composites
- Author
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Scarfato, Paola, primary, Incarnato, Loredana, additional, Di Maio, Luciano, additional, Dittrich, Bettina, additional, and Schartel, Bernhard, additional
- Published
- 2016
- Full Text
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31. Investigation on the use of foamed plastic waste as natural aggregates replacement in lightweight mortar
- Author
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Coppola, Bartolomeo, primary, Courard, Luc, additional, Michel, Frédéric, additional, Incarnato, Loredana, additional, and Di Maio, Luciano, additional
- Published
- 2016
- Full Text
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32. ELIMINATION OF XYLOPHAGES FROM WOOD THROUGH MICROWAVE TREATMENT: MICROSTRUCTURAL EXPERIMENTS.
- Author
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Crova, Cesare, Chiadini, Francesco, Di Maio, Luciano, Guerriero, Luigi, and Pescione, Luca
- Subjects
MICROWAVES ,WOOD ,MICROSTRUCTURE - Abstract
Copyright of Conservation Science in Cultural Heritage / Quaderni di Scienza della Conservazione is the property of Salvatore Lorusso and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2017
33. Regenerative Recycling of Automotive Polymer Components: Polypropylene based Car Bumpers
- Author
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Luda, M. P., Ragosta, G., Musto, P., Acierno, D., DI MAIO, Luciano, Camino, G., and Nepote, V.
- Published
- 2003
34. COPOLYAMIDE/CLAY NANOCOMPOSITES BY MELT COMPOUNDING: MORPHOLOGICAL, THERMAL AND RHEOLOGICAL PROPERTIES
- Author
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Incarnato, Loredana, Russo, G. M., Scarfato, Paola, DI MAIO, Luciano, Acierno, D., Acierno, Domenico, P., Scarfato, L., Incarnato, G. M., Russo, and L., DI MAIO
- Subjects
nanocomposites ,morphology ,rheology ,melt compounding - Published
- 2003
35. Modelling of mechanical behaviour of polyamide nanocomposite fibres using a three-phase Halpin-Tsai model
- Author
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Garofalo, Emilia, primary, Russo, Giovanna Maria, additional, Di Maio, Luciano, additional, and Incarnato, Loredana, additional
- Published
- 2009
- Full Text
- View/download PDF
36. Cellulose Nanofiber-Based Nanocomposite Films Reinforced with Zinc Oxide Nanorods and Grapefruit Seed Extract.
- Author
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Roy, Swarup, Kim, Hyun Chan, Panicker, Pooja S., Rhim, Jong-Whan, Kim, Jaehwan, Di Maio, Luciano, and Incarnato, Loredana
- Subjects
ZINC oxide films ,ZINC oxide synthesis ,ACTIVE food packaging ,ZINC oxide ,NANORODS ,VAPOR barriers ,GRAPEFRUIT - Abstract
Here, we report the fabrication and characterization of cellulose nanofiber (CNF)-based nanocomposite films reinforced with zinc oxide nanorods (ZnOs) and grapefruit seed extract (GSE). The CNF is isolated via a combination of chemical and physical methods, and the ZnO is prepared using a simple precipitation method. The ZnO and GSE are used as functional nanofillers to produce a CNF/ZnO/GSE film. Physical (morphology, chemical interactions, optical, mechanical, thermal stability, etc.) and functional (antimicrobial and antioxidant activities) film properties are tested. The incorporation of ZnO and GSE does not impact the crystalline structure, mechanical properties, or thermal stability of the CNF film. Nanocomposite films are highly transparent with improved ultraviolet blocking and vapor barrier properties. Moreover, the films exhibit effective antimicrobial and antioxidant actions. CNF/ZnO/GSE nanocomposite films with better quality and superior functional properties have many possibilities for active food packaging use. [ABSTRACT FROM AUTHOR]
- Published
- 2021
- Full Text
- View/download PDF
37. Study on Improving the Processability and Properties of Mixed Polyolefin Post-Consumer Plastics for Piping Applications.
- Author
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Garofalo, Emilia, Di Maio, Luciano, Scarfato, Paola, Pietrosanto, Arianna, Protopapa, Antonio, and Incarnato, Loredana
- Subjects
- *
PLASTIC pipe , *PIPE fittings , *PACKAGING recycling , *FLEXURAL modulus , *FLEXIBLE packaging , *PILOT plants , *PIPE , *STEEL pipe - Abstract
This study focuses on the upgrading strategies to make Fil-s (acronym for film-small), a polyolefin-based material coming from the mechanical recycling of post-consumer flexible packaging, fit for re-use in the piping sector. The effects of washing treatments (at cold and hot conditions) and the addition of an experimental compatibilizer on the chemical-physical properties of Fil-s were first assessed. The measurements of some key properties (density, melt flow index, flexural modulus, yield strength), for both Fil-s as such and the different developed Fil-s based systems, was also conducted in order to evaluate the suitability of this complex and challenging waste stream to replace virgin PE-based pipe and fitting products, in compliance to ASTM D3350 standard. The outcomes of the present work contributed to define a code, for each Fil-s system investigated, useful for identifying the level of their performance in piping applications. All the recyclates were extruded as pipes by using a pilot scale plant, but the process resulted more stable and continuous with the compatibilized Fil-s, as it was deducible from its flow properties. Moreover, the best mechanical performances were exhibited by the hot-washed Fil-s pipes, with an increase in pipe stiffness equal to 65% respect to the unwashed sample. [ABSTRACT FROM AUTHOR]
- Published
- 2021
- Full Text
- View/download PDF
38. New Materials and Technologies for Durability and Conservation of Building Heritage
- Author
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Luigi Coppola, Tiziano Bellezze, Alberto Belli, Alessandra Bianco, Elisa Blasi, Miriam Cappello, Domenico Caputo, Mehdi Chougan, Denny Coffetti, Bartolomeo Coppola, Valeria Corinaldesi, Alberto D’Amore, Valeria Daniele, Luciano Di Maio, Luca Di Palma, Jacopo Donnini, Giuseppe Ferrara, Sara Filippi, Matteo Gastaldi, Nicola Generosi, Chiara Giosuè, Loredana Incarnato, Francesca Lamastra, Barbara Liguori, Ludovico Macera, Qaisar Maqbool, Maria Cristina Mascolo, Letterio Mavilia, Alida Mazzoli, Franco Medici, Alessandra Mobili, Giampiero Montesperelli, Giorgio Pia, Elena Redaelli, Maria Letizia Ruello, Paola Scarfato, Giuliana Taglieri, Francesca Tittarelli, Jean-Marc Tulliani, Antonino Valenza, Coppola, Luigi, Bellezze, Tiziano, Belli, Alberto, Bianco, Alessandra, Blasi, Elisa, Cappello, Miriam, Caputo, Domenico, Chougan, Mehdi, Coffetti, Denny, Coppola, Bartolomeo, Corinaldesi, Valeria, D'Amore, Alberto, Daniele, Valeria, Di Maio, Luciano, Di Palma, Luca, Donnini, Jacopo, Ferrara, Giuseppe, Filippi, Sara, Gastaldi, Matteo, Generosi, Nicola, Giosuè, Chiara, Incarnato, Loredana, Lamastra, Francesca, Liguori, Barbara, Macera, Ludovico, Maqbool, Qaisar, Cristina Mascolo, Maria, Mavilia, Letterio, Mazzoli, Alida, Medici, Franco, Mobili, Alessandra, Montesperelli, Giampiero, Pia, Giorgio, Redaelli, Elena, Letizia Ruello, Maria, Scarfato, Paola, Taglieri, Giuliana, Tittarelli, Francesca, Tulliani, Jean-Marc, and Valenza, Antonino
- Subjects
durability, concrete structures, sustainability, new materials ,Settore ING-IND/22 - Scienza e Tecnologia dei Materiali ,new material ,concrete structures ,durability ,General Materials Science ,new materials ,sustainability ,Concrete structures ,concrete structure - Abstract
The increase in concrete structures’ durability is a milestone to improve the sustainability of buildings and infrastructures. In order to ensure a prolonged service life, it is necessary to detect the deterioration of materials by means of monitoring systems aimed at evaluating not only the penetration of aggressive substances into concrete but also the corrosion of carbon-steel reinforcement. Therefore, proper data collection makes it possible to plan suitable restoration works which can be carried out with traditional or innovative techniques and materials. This work focuses on building heritage and it highlights the most recent findings for the conservation and restoration of reinforced concrete structures and masonry buildings.
- Published
- 2023
39. Multilayer Nanocomposite Polymetric Packaging For Microwave Applications.
- Author
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Galdi, Maria Rosaria, Olivieri, Rita, Liguori, Loredana, Albanese, Donatella, Di Matteo, Marisa, and Di Maio, Luciano
- Subjects
- *
X-ray diffraction , *POLYMETHINES , *HETEROCYCLIC compounds , *CRYSTALLINE electric field , *ELECTRIC properties of crystals - Abstract
Microwaveable packaging material should ensure good preservation of the product before cooking/ heating such as high barriers to gases and aromas and adequate control of water vapor transmission. Among the polymers used in flexible packaging, crystalline poly(ethylene terephthalate) (CPET) is characterized by good oxygen barrier properties and quite high heat stability which ensures the absence of alterations of foods flavors. CPET trays or films are suitable for Ready To Cook (RTC) products within a temperature range from -40 to + 220°C. The aim of this work was the production and characterization of nanocomposite multilayer PET films, for microwave applications, in which the nanoclay acts as a heating enhancer. Films prototypes were made by means of laboratory compounding equipment for the production of nanocomposite CPET and by a co-extrusion equipment for producing multilayer films using two different PET copolymer matrices and a modified nanoclay (Cloisite 20A) as heating enhancer. The study of morphology of nanocomposite layer by means of X-ray diffraction experiments was carried out in order to correlate the intercalation/exfoliation degree of nanoclay with cooking performance. [ABSTRACT FROM AUTHOR]
- Published
- 2016
40. Informe sobre el impacto de las medidas de aislamiento social preventivo en el sector productivo del Partido de General Pueyrredon
- Author
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Graña, Fernando Manuel, Barbini, Bernarda, Zaballa, Esteban, Mauro, Lucía Mercedes, Liseras, Natacha, Calá, Carla Daniela, Graña, Fernando Manuel, Castellucci, Daniela I., Corbo, Yanina A., Cruz, Gonzalo, Roldán, Nadia G., Teyseyre, Jesica, Rech, Lautaro, Giudice, Adrián José Antonio, García, Noelia, Paladino, Máximo, Di Maio, Luciano, and Vidal, Melisa
- Subjects
Partido de General Pueyrredon ,COVID-19 ,Sector Turístico ,Impacto Económico ,Sector Productivo ,Sindicatos ,Sector Industrial ,Actividad Económica ,Aislamiento Social ,Cooperativas - Abstract
El presente informe caracteriza la situación del sector productivo del Partido de General Pueyrredon (PGP) frente a las medidas de Aislamiento Social Preventivo Obligatorio. Para ello inicialmente se analiza la situación de la industria desde la perspectiva empresarial y luego del sector turístico del PGP. Estos apartados fueron realizados por el Grupo de Análisis Industrial, el Grupo de Turismo y Sociedad y la Secretaría de Vinculación con el Medio. A esto se le adiciona en tres recuadros las consideraciones de representantes de instituciones empresariales vinculadas al comercio, de cooperativas y de organizaciones sindicales y sociales. Este trabajo fue realizado por el Centro de Desarrollo Económico Territorial y el Grupo de Extensión Economía Social y Solidaria de la Facultad de Ciencias Económicas y Sociales y el Consejo Social de la Universidad Nacional de Mar del Plata., Fil: Graña, Fernando Manuel. Universidad Nacional de Mar del Plata. Facultad de Ciencias Económicas y Sociales; Argentina., Fil: Barbini, Bernarda. Universidad Nacional de Mar del Plata. Facultad de Ciencias Económicas y Sociales; Argentina., Fil: Zaballa, Esteban. Universidad Nacional de Mar del Plata. Facultad de Ciencias Económicas y Sociales; Argentina.
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- 2020
41. Use of End-of-Waste Foamed Fibers and Aggregates into a Cementitious Mortar
- Author
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Coppola, Bartolomeo, Reverchon, Ernesto, Nguyen, Frédéric, Di Maio, Luciano, Courard, Luc, Nobile, Maria Rossella, and Martinelli, Enzo
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Mortar ,Aggregates ,Fiber ,ING-IND/22 SCIENZA E TECNOLOGIA DEI MATERIALI - Abstract
2015 - 2016, Durability and sustainability of cementitious materials are two important issues in the field of construction materials. Durability is defined as the ability of cementitious materials to resist weathering action, chemical attack, abrasion or any other process of deterioration. The use of fibers is a viable solution to partially overcome the brittle behavior of such materials. At the same time it is demonstrated that fibers, by reducing cracking phenomena, allow to face the durability related issues. Different fibers have been used according to the aims of composite materials: high strength fibers are generally used for structural purposes (toughness increase) while low modulus synthetic fibers are mainly used to avoid plastic shrinkage cracking. The effectiveness of fibers reinforcing action lies mainly on the fiber/matrix interactions. Three types of interactions can be recognized: i) physical and/or chemical adhesion; ii) friction and iii) mechanical anchorage induced by deformations on the fiber surface (e.g. crimps, hooks, twisted or deformed fibers in general). Sustainability can be identified according to the definition of sustainable development stated in 1987 by Brundtland et al.: “the development that meets the needs of the present without compromising the ability of future generations to meet their own needs”. Sustainable development should take into account economic growth, social equality and environmental protection. The construction industry involves all these fields: the main concerns are raw materials consumption and CO2 emissions during cement production. Moreover, also the plastic production and disposal present several environmental issues. Once again, raw materials consumption and the speed with which these materials became waste. Thus, seen the aforementioned drawbacks related to cementitious materials, this Ph.D. was aimed to study the possibility of using end-ofwaste materials (i.e when waste ceases to be waste and becomes a secondary raw material) for the production of synthetic fibers and aggregates characterized by improved mechanical interactions with the cementitious matrix. To this extent, fibers and aggregates with a rough and porous surface, able to offer interlocking positions for the cementitious matrix, were produced in laboratory by melt extrusion-foaming process. Moreover, some chemical treatments (alkaline hydrolysis and sol-gel deposition of nanosilica) were performed on fibers, to improve chemical adhesion with the cement paste. Finally, taking into account the need for reducing the consumption of raw materials, foamed fibers and aggregates were produced starting from a polymeric end-of-waste material made of a polyolefins blend (HDPE, LDPE and PP). Alkaline hydrolysis promoted the creation of interlocking positions on fiber surface but the best behavior was recognized for fibers with nano-silica particles on the surface. In this case, a denser ITZ and a great amount of hydration products were observed by SEM investigations. Pull-out tests confirmed the better performances of treated fibers: a higher pull-out peak load was achieved and an increase of pull-out energy was evident. Subsequently, a foam extrusion process was used to manufacture polymeric fibers (both virgin and recycled) with a rough surface, to improve mechanical friction with the cementitious matrix. Optimizing foaming agent quantity and processing parameters was possible to produce fibers having adequate surface texture and diameter to be used in fiber reinforced mortars. Although fiber reinforced mortars workability decreases at increasing fiber volume fraction, the results demonstrated that this happens to a lower extent for mortars containing foamed fibers. Fibers mechanical properties decreased at increasing fibers porosity but fiber reinforced mortars mechanical properties, flexural and compressive strength, were not influenced by fibers addition nor their morphology. The rougher surface gives rise to a better fiber/matrix adhesion, as confirmed by pull-out tests. Durability investigations on the fiber reinforced mortars reported good results for capillary water absorption, sulfate attack and plastic shrinkage cracking. In particular, fibers length and volume fraction are key parameters in controlling plastic shrinkage cracking. Moreover, mortar samples containing foamed fibers displayed a better control of shrinkage cracking: cracks opening was delayed and the improved fiber/matrix bond was able to reduce crack width, compared to mortars containing smooth fibers. Finally, lightweight artificial aggregates (LWAs) were produced, starting from foamed strands. At increasing LWAs substitution, a sharp decrease of density was achieved. Also workability and mechanical properties decreased, but a more ductile behaviour was recognizable. Thermal conductivity and water vapor resistance were proportional to mortars density which obviously decreased at increasing natural sand substitutions. Moreover, the use of aggregates porosity as reservoir of internal curing water showed promising preliminary results. In brief, the results of this study demonstrate that engineered fibers with improved fiber/matrix bond allow to optimize (i.e. to reduce) fibers volume fraction in cementitious mortars. Foamed fibers characteristics can be in turn optimized by changing the manufacturing process conditions. Benefits could be not only in the control of plastic shrinkage cracking but also in the workability of fresh mortars, mechanical strength and durability of the hardened composite. In addition, using end-of-waste materials a more sustainable product can be obtained. In particular, replacing natural aggregates with plastic aggregates, is possible to reduce raw materials consumption and improve mortar properties (mainly unit weight, thermal conductivity and water vapor permeability). [edited by author], La durabilità e la sostenibilità dei materiali cementizi sono argomenti estremamente importanti nell’ambito dei materiali da costruzione. La durabilità è definita come l’abilità dei materiali cementizi a resistere nel tempo alle azioni di degrado, di attacco chimico, abrasione o qualunque altro processo di deterioramento. L’uso delle fibre consente di ovviare, seppur in modo parziale, al problema del comportamento fragile di tali materiali. È inoltre ampiamente dimostrato che le fibre, contrastando i fenomeni fessurativi, consentono di far fronte anche ai problemi legati alla durabilità. In letteratura sono state utilizzate diverse fibre, a seconda del composito da realizzarsi: fibre ad elevato modulo elastico vengono utilizzate per scopi strutturali (incremento di duttilità) mentre fibre con basso modulo sono utilizzate nel contrasto alla fessurazione. Nell’efficacia dell’azione esplicata dalle fibre gioca un ruolo fondamentale l’interazione fibra/matrice. Tre diverse tipologie di interazione sono riscontrabili: i) adesione di tipo fisica e/o chimica; ii) frizione e iii) ancoraggio meccanico dovuto alle deformazioni presenti sulla superficie delle fibre (ad esempio rilievi, uncini, scanalature ecc.). La sostenibilità può essere definita per tramite del concetto di sviluppo sostenibile, espresso nel 1987 dal rapporto Brundtland, come lo “sviluppo che incontra i bisogni della generazione presente senza compromettere la possibilità delle generazioni future di soddisfare i propri”. Lo sviluppo sostenibile deve portare in conto la crescita economica, l’uguaglianza sociale e la protezione ambientale. L’industria delle costruzioni coinvolge tutti questi settori ed i principali problemi sono legati al consumo delle materie prime e all’emissione di CO2 durante la produzione del cemento. Inoltre, anche la produzione della plastica e la sua relativa dismissione, pone alcuni problemi ambientali. Detto ciò, viste le problematiche precedentemente esposte relative sia ai materiali cementizi che plastici, le ricerche di dottorato sono state dedicate allo studio della possibilità di utilizzare materiali end-of-waste (cioè materiali che hanno cessato di essere rifiuti e sono diventati materie prime seconde) per la produzione di fibre ed aggregati sintetici, caratterizzati da una migliore interazione di tipo meccanico con la matrice cementizia. A tale scopo, le fibre e gli aggregati sono state prodotti in laboratorio attraverso un processo di melt-extrusion foaming, per ottenere una superficie scabra e porosa, capace di offrire posizioni di incastro per la matrice cementizia. Inoltre, sono stati sperimentati sulle fibre anche due trattamenti chimici (idrolisi alcalina e deposizione tramite processo sol-gel di nano-silice), in maniera tale da incrementare l’affinità chimica con la pasta cementizia. Infine, considerando anche la necessità di ridurre il consumo delle materie prime, delle fibre e degli aggregati schiumati sono stati prodotti partendo da un materiale polimerico end-of-waste costituito da una miscela di poliolefine (HDPE, LDPE e PP). L’idrolisi alcalina ha promosso la creazione di posizioni di incastro sulla superfice delle fibre ma il miglior comportamento è stato riscontrato per le fibre ricoperte di nano-silice in superficie. In questo caso è riconoscibile una più densa ITZ e sono stati osservati anche un gran numero di prodotti di idratazione tramite SEM. Le prove di pull-out hanno confermato le migliori prestazioni delle fibre trattate poiché è stato raggiunto un carico di pull-out più elevato oltre ad un incremento dell’energia di pull-out. Successivamente, un processo di foam extrusion è stato utilizzato per produrre fibre polimeriche (sia vergini che riciclate) con una superficie ruvida, per incrementare la frizione meccanica con la malta cementizia. Ottimizzando la quantità di agente schiumante ed i parametri di processo è stato possibile produrre fibre con un’adeguata tessitura superficiale e diametro, tali da poter essere utilizzate per il rinforzo di una malta cementizia. Nonostante la riduzione di lavorabilità delle malte, all’aumentare della frazione volumetrica di fibre, le prove sperimentali hanno dimostrato che l’entità di tale riduzione è minore nel caso in cui vengano utilizzate fibre schiumate. Le proprietà meccaniche delle fibre diminuiscono all’aumentare della porosità delle fibre ma le proprietà meccaniche delle malte rinforzate con tali fibre (resistenza a compressione e flessione) non risultano influenzate dalla presenza delle fibre né dalla loro morfologia. La maggiore rugosità della superficie porta ad una migliore adesione fibra/matrice, come confermato dalle prove di pull-out. Lo studio della durabilità sulle malte fibro-rinforzate ha restituito buoni risultati nei confronti dell’assorbimento d’acqua per capillarità, attacco solfatico e fessurazione da ritiro plastico. In particolare, la lunghezza e la frazione volumetrica delle fibre sono dei parametri chiave nel controllo di tale fenomeno. Inoltre, i campioni di malta contenenti le fibre schiumate hanno mostrato un maggior controllo nei confronti della fessurazione da ritiro, ritardando l’apertura delle fessure e riducendo l’ampiezza delle stesse, grazie alla migliore adesione, rispetto alle malte contenenti fibre lisce. Infine, a partire dai filamenti schiumati sono stati prodotti degli aggregati artificiali alleggeriti (LWAs). All’aumentare della sostituzione della sabbia naturale con LWAs, è stata ottenuta una marcata riduzione di densità. Inoltre, anche la lavorabilità e le proprietà meccaniche sono diminuite, ma è stato riscontrato un comportamento più duttile. La conducibilità termica e la resistenza al passaggio di vapor d’acqua diminuiscono all’aumentare della sostituzione di sabbia silicea, in maniera proporzionale alla riduzione di densità. Inoltre, l’uso della porosità degli aggregati come serbatoio d’acqua per l’internal curing ha riportato risultati promettenti. In conclusione, i risultati di questo studio hanno dimostrato che l’utilizzo di fibre ingegnerizzate con una migliore adesione all’interfaccia fibra/matrice permette di ottimizzare (cioè di ridurre) la frazione volumetrica di fibre da utilizzare nelle malte cementizie. Le caratteristiche delle fibre schiumate possono di volta in volta essere cambiate ed ottimizzate, cambiando il processo di produzione. I vantaggi ottenuti sono sia in termini di controllo della fessurazione da ritiro plastico che nella lavorabilità allo stato fresco delle malte rinforzate, ma anche proprietà meccaniche e di durabilità del composito indurito. In aggiunta, utilizzando un materiale endof-waste, può essere ottenuto un materiale più sostenibile. In particolare, sostituendo gli aggregati naturali con aggregati plastici, è possibile ridurre il consumo di materie prime e migliorare alcune proprietà della malta: in particolare densità, conducibilità termica e permeabilità al vapor d’acqua. [a cura dell'autore], XV n.s. (XXIX)
- Published
- 2018
- Full Text
- View/download PDF
42. Binders alternative to Portland cement and waste management for sustainable construction – Part 2
- Author
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Letterio Mavilia, Franco Medici, Francesco Todaro, Andrea Brenna, Luigi Coppola, Matteo Maria Gastaldi, Tiziano Bellezze, Alberto Belli, Giorgio Vilardi, Valeria Corinaldesi, Milena Marroccoli, Denny Coffetti, Domenico Caputo, Fan Yang, Giorgio Pia, Valeria Daniele, Andrea Petrella, Marco Ormellese, Ilenia Farina, Maria Cristina Mascolo, Luciano Di Maio, Alida Mazzoli, Marta Cappai, Sebastiano Candamano, Ludovica Casnedi, Ottavio Marino, Marina Cabrini, Glauco Merlonetti, Elena Redaelli, Francesco Colangelo, Francesco Delogu, Bartolomeo Coppola, Paola Scarfato, Raffaele Cioffi, Stefania Manzi, Fabio Maria Bolzoni, MariaPia Pedeferri, Loredana Incarnato, Barbara Liguori, Ombretta Cocco, Maddalena Carsana, Francesca Tittarelli, Tommaso Pastore, Giuliana Taglieri, Michele Notarnicola, Giuseppina Roviello, Paola Meloni, G Scoccia, Fortunato Crea, Sergio Lorenzi, Jacopo Donnini, Alessandra Mobili, Antonio Telesca, Elena Crotti, Sabino De Gisi, Maria Vittoria Diamanti, Maria Chiara Bignozzi, Rosa Di Mundo, Claudio Ferone, Patrizia Frontera, Federica Lollini, Chiara Giosuè, Luca Di Palma, Coppola, Luigi, Bellezze, Tiziano, Belli, Alberto, Bignozzi, Maria C, Bolzoni, Fabio, Brenna, Andrea, Cabrini, Marina, Candamano, Sebastiano, Cappai, Marta, Caputo, Domenico, Carsana, Maddalena, Casnedi, Ludovica, Cioffi, Raffaele, Cocco, Ombretta, Coffetti, Denny, Colangelo, Francesco, Coppola, Bartolomeo, Corinaldesi, Valeria, Crea, Fortunato, Crotti, Elena, Daniele, Valeria, De Gisi, Sabino, Delogu, Francesco, Diamanti, Maria V, Di Maio, Luciano, Di Mundo, Rosa, Di Palma, Luca, Donnini, Jacopo, Farina, Ilenia, Ferone, Claudio, Frontera, Patrizia, Gastaldi, Matteo, Giosuè, Chiara, Incarnato, Loredana, Liguori, Barbara, Lollini, Federica, Lorenzi, Sergio, Manzi, Stefania, Marino, Ottavio, Marroccoli, Milena, Mascolo, Maria C, Mavilia, Letterio, Mazzoli, Alida, Medici, Franco, Meloni, Paola, Merlonetti, Glauco, Mobili, Alessandra, Notarnicola, Michele, Ormellese, Marco, Pastore, Tommaso, Pedeferri, Maria Pia, Petrella, Andrea, Pia, Giorgio, Redaelli, Elena, Roviello, Giuseppina, Scarfato, Paola, Scoccia, Giancarlo, Taglieri, Giuliana, Telesca, Antonio, Tittarelli, Francesca, Todaro, Francesco, Vilardi, Giorgio, and Yang, Fan
- Subjects
Engineering ,Settore ING-IND/22 - Scienza e Tecnologia dei Materiali ,traditional binder ,0211 other engineering and technologies ,Biophysics ,Biomedical Engineering ,construction materials ,Portland-free binders ,Sustainability ,traditional binders ,waste management ,Bioengineering ,Biomaterials ,02 engineering and technology ,engineering.material ,law.invention ,law ,021105 building & construction ,Production (economics) ,Recycling ,Lime ,Waste management ,business.industry ,Green Chemistry Technology ,Oxides ,General Medicine ,construction material ,Calcium Compounds ,021001 nanoscience & nanotechnology ,Silicon Dioxide ,Natural resource ,Biomaterial ,Portland-free binder ,Cultural heritage ,Portland cement ,Sustainable construction ,Biophysic ,Sustainability, waste management, traditional binders, Portland-free binders, construction materials ,Clay ,Rubber ,Waste Management ,Construction Materials ,0210 nano-technology ,business - Abstract
The paper represents the “state of the art” on sustainability in construction materials. In Part 1 of the paper, issues related to production, microstructures, chemical nature, engineering properties, and durability of mixtures based on binders alternative to Portland cement were presented. This second part of the paper concerns the use of traditional and innovative Portland-free lime-based mortars in the conservation of cultural heritage, and the recycling and management of wastes to reduce consumption of natural resources in the production of construction materials. The latter is one of the main concerns in terms of sustainability since nowadays more than 75% of wastes are disposed of in landfills.
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- 2018
43. Binders alternative to Portland cement and waste management for sustainable construction—part 1
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Marco Ormellese, Andrea Brenna, Rosa Di Mundo, Chiara Giosuè, Luca Di Palma, Bartolomeo Coppola, Luigi Coppola, Denny Coffetti, G Scoccia, Paola Scarfato, Letterio Mavilia, Giorgio Vilardi, Ottavio Marino, Tommaso Pastore, Elena Crotti, Milena Marroccoli, Franco Medici, Giuliana Taglieri, Francesca Tittarelli, Valeria Daniele, Elena Redaelli, Maria Chiara Bignozzi, Sergio Lorenzi, Tiziano Bellezze, Alida Mazzoli, Marta Cappai, Claudio Ferone, Stefania Manzi, Raffaele Cioffi, Giorgio Pia, Sebastiano Candamano, Fabio Maria Bolzoni, Ludovica Casnedi, Maria Cristina Mascolo, Maria Vittoria Diamanti, Francesco Todaro, Patrizia Frontera, MariaPia Pedeferri, Glauco Merlonetti, Ilenia Farina, Sabino De Gisi, Andrea Petrella, Matteo Maria Gastaldi, Federica Lollini, Alberto Belli, Marina Cabrini, Valeria Corinaldesi, Ombretta Cocco, Domenico Caputo, Maddalena Carsana, Fan Yang, Loredana Incarnato, Jacopo Donnini, Alessandra Mobili, Antonio Telesca, Fortunato Crea, Michele Notarnicola, Giuseppina Roviello, Paola Meloni, Luciano Di Maio, Francesco Colangelo, Francesco Delogu, Barbara Liguori, Coppola, Luigi, Bellezze, Tiziano, Belli, Alberto, Bignozzi, Maria Chiara, Bolzoni, Fabio, Brenna, Andrea, Cabrini, Marina, Candamano, Sebastiano, Cappai, Marta, Caputo, Domenico, Carsana, Maddalena, Casnedi, Ludovica, Cioffi, Raffaele, Cocco, Ombretta, Coffetti, Denny, Colangelo, Francesco, Coppola, Bartolomeo, Corinaldesi, Valeria, Crea, Fortunato, Crotti, Elena, Daniele, Valeria, De Gisi, Sabino, Delogu, Francesco, Diamanti, Maria Vittoria, Di Maio, Luciano, Di Mundo, Rosa, Di Palma, Luca, Donnini, Jacopo, Farina, Ilenia, Ferone, Claudio, Frontera, Patrizia, Gastaldi, Matteo, Giosuè, Chiara, Incarnato, Loredana, Liguori, Barbara, Lollini, Federica, Lorenzi, Sergio, Manzi, Stefania, Marino, Ottavio, Marroccoli, Milena, Mascolo, Maria Cristina, Mavilia, Letterio, Mazzoli, Alida, Medici, Franco, Meloni, Paola, Merlonetti, Glauco, Mobili, Alessandra, Notarnicola, Michele, Ormellese, Marco, Pastore, Tommaso, Pedeferri, Maria Pia, Petrella, Andrea, Pia, Giorgio, Redaelli, Elena, Roviello, Giuseppina, Scarfato, Paola, Scoccia, Giancarlo, Taglieri, Giuliana, Telesca, Antonio, Tittarelli, Francesca, Todaro, Francesco, Vilardi, Giorgio, and Yang, Fan
- Subjects
Engineering ,alternative binders ,Building materials ,concrete ,Portland cement ,sustainability ,waste management ,Alkalies ,Aluminum Compounds ,Aluminum Silicates ,Calcium Compounds ,Corrosion ,Sulfur Compounds ,Waste Management ,Construction Materials ,Green Chemistry Technology ,Biophysics ,Bioengineering ,Biomaterials ,Biomedical Engineering ,0211 other engineering and technologies ,02 engineering and technology ,law.invention ,law ,021105 building & construction ,Sulfur Compound ,Waste management ,General Medicine ,021001 nanoscience & nanotechnology ,Environmentally friendly ,Calcium Compound ,cement ,binders ,construction materials ,Building materials, concrete, Portland cement, sustainability, alternative binders, waste management ,Alkalie ,0210 nano-technology ,Settore ING-IND/22 - Scienza e Tecnologia dei Materiali ,alternative binder ,Clay ,business.industry ,Biomaterial ,Construction Material ,Sustainable construction ,Biophysic ,Aluminum Silicate ,Greenhouse gas ,Sustainability ,Building material ,Mortar ,business ,Aluminum Compound - Abstract
This review presents “a state of the art” report on sustainability in construction materials. The authors propose different solutions to make the concrete industry more environmentally friendly in order to reduce greenhouse gases emissions and consumption of non-renewable resources. Part 1—the present paper—focuses on the use of binders alternative to Portland cement, including sulfoaluminate cements, alkali-activated materials, and geopolymers. Part 2 will be dedicated to traditional Portland-free binders and waste management and recycling in mortar and concrete production.
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- 2018
44. Transport properties of modified concrete by surface and bulk hydrophobization via nano-clay addition
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Fariello, Maria Letizia, Ciambelli, Paolo, Di Maio, Luciano, and Incarnato, Loredana
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Transport properties ,Nano-clay ,Concrete ,ING-IND/22 SCIENZA E TECNOLOGIA DEI MATERIALI - Abstract
2010 - 2011 In recent decades, the concrete for years considered unchangeable and with an unlimited life, with exceptional mechanical properties which have determined principally its success, was in fact subject to phenomena of degradation which over time alter its durability. The degradation of concrete is hardly attributable to a single cause because often multiple processes can occur simultaneously, interacting in a synergistic way. Any degradation mechanism occurs, it is closely related to transport and diffusion of water in the concrete, i.e. the degree of porosity. Although the porosity of the concrete substrate is an intrinsic characteristic of the material itself, and therefore unavoidable, its control is crucial. The protective polymer-based resins are the most commonly used for concrete structures, because they are very effective to provide a physical barrier to the ingress of water, ions and gases. Despite their good efficacy in prolonging the service life of the structures, there is a need for further increase the barrier properties and their compatibility with the substrate in aggressive environmental conditions. In recent times, polymer-organoclay nanocomposites have emerged as a new class of high performance materials: in these systems nanoparticles are homogeneously dispersed in the polymer matrix in order to obtain an exfoliated structure. The high aspect ratio, which means a strong interactions between the nanofillers and the polymer, make the nanocomposites excellent organic-inorganic systems (compared to pure polymer or microcomposite systems), in terms of mechanical, thermal, optical and barrier properties. This is the reason why, it has been thought to use these systems as potentially effective protective coating for building structures, even in the most severe environmental conditions. In this thesis work different systems obtained by mixing a filler, in particular two kind of montmorillonite organically modified, with fluoro-based resins and silane-siloxane have been studied. The protective efficacy of these systems, at different charge content has been verified and the results demonstrate the potential application of polymer/organoclay nanocomposites as surface treatment materials for concrete structures. Moreover, in literature very often the use of some additives such as micro and nanoparticles is studied because it is expected that both strength and durability of a concrete could be enhanced if the overall porosity is reduced. In particular in the last years different kinds of inorganic nanoparticles, due to their physical and chemical properties, are very often integrated with cement-based building materials; in fact, thanks to their high surface area to volume ratio they can react with calcium hydroxide (Ca(OH)2) crystals, arrayed in the interfacial transition zone, and produce C–S–H gel which fills the voids to improve the density of the interfacial zone. Stable gel structures can be formed and the mechanical and the service-life properties of hardened cement paste can be improved when a smaller amount of nanoparticles is added. On the other hand, the same hydrophobic agents used as surface protective, thanks to their capability in reduction significantly the molecular attraction between the water and the concrete, could be directly added in the concrete mix in order to make the whole concrete bulk hydrophobic. Thus, in this work the research is aimed to investigate the separated and combined effect of a hydrophobic resin (silanes and siloxanes in water base) and of the nanoparticles (two montmorillonites organically modified, the Cloisite 30B and the Halloysite) on concrete durability in relation with the analysis of transport properties of cement based systems, not yet deepened in literature. [edited by author] X n.s.
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- 2012
45. SUPRAMOLECULAR STRUCTURE OF LIQUID-CRYSTALLINE POLYESTERS IN TRICLINIC CELL
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Pio Iannelli, Luciano Di Maio, Paola Scarfato, Bernard Lotz, Simona Concilio, Domenico Acierno, Acierno, Domenico, P., Scarfato, Concilio, S., DI MAIO, L., Iannelli, P., Lotz, B., Concilio, Simona, DI MAIO, Luciano, Iannelli, Pio, Lotz, Bernard, and Scarfato, Paola
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Liquid crystal polymers ,Phase transition ,Materials science ,Polymers and Plastics ,Crystal structure ,Organic Chemistry ,Supramolecular chemistry ,Triclinic crystal system ,Supramolecular assembly ,Inorganic Chemistry ,Phase (matter) ,Polymer chemistry ,Solvents ,Materials Chemistry ,Side chain ,Molecular structure ,Pendant group - Abstract
We have analyzed the phase behavior of a series of liquid-crystalline polyesters bearing the n-alkoxy pendant group. For n ) 1-4, this class of polymers shows a crystalline phase, called phase I, with a layered molecular packing and two chains per unit cell. For n > 4, a new molecular packing is observed. The new phase, called phase II, is characterized by the supramolecular assembly of 10-12 chains, each structurally independent of the others. This assembly is located in a large triclinic cell: in the case of P(5), the cell parameters are a ) 18.67 A, b ) 17.54 A, c ) 21.23 A, R) 111.1°, ‚ ) 81.7°, and A ) 105.5°, with 10 chains per unit cell (dcalcd ) 1.23 g cm-3). The molecular packing of phase II is well- described in terms of a "fracture" of the layered molecular structure of phase I. This fracture is restored when samples are dipped into chlorinate solvents. The reason the packing fracture of phase I occurs is not clear: we believe that a complex balance between "packing incompatibility" of rigid chains and flexible side groups might be responsible for this phenomenon.
- Published
- 2002
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