3,310 results on '"roadways"'
Search Results
2. Using the ISO Detection response task to measure the cognitive load of driving four separate vehicles on two distinct highways.
- Author
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Biondi, Francesco N., McDonnell, Amy, Cooper, Joel, and Strayer, David L.
- Subjects
- *
COGNITIVE load , *EXPRESS highways , *STIMULUS & response (Psychology) , *ROADS , *ROAD construction , *REACTION time - Abstract
• We applied the ISO DRT to measure the cognitive load of driving four vehicles on two highways with distinct characteristics. • Worse DRT performance was found on the narrower, more winding highway. • Vehicle-specific differences were also found. • DRT performance in the Volvo was worse than that observed for the Tesla, Nissan, and Cadillac. The ISO Detection Response Task (DRT) is a standard tool for assessing drivers' cognitive load and it has primarily been used to measure the cognitive load of completing non-driving tasks and interacting with vehicle systems. In this study we use the DRT to measure the workload of driving four separate vehicles (a 2019 Tesla Model 3, a 2018 Cadillac CT6, a 2018 Volvo XC90, a 2019 Nissan Rogue) in manual mode and on two distinct roadways (US Interstate Highway 15 and 80) in and around Salt Lake City, UT. Results showed that the unique road characteristics of I-80 resulted in higher levels of cognitive load as demonstrated by the slower DRT response times. Likewise, different levels of workload were found across the four vehicles, with higher workload levels found for one of the four vehicles. This study expands the use of the DRT outside its original area of application, and advances it as a tool to assess the cognitive demand induced by varying road and vehicle characteristics. [ABSTRACT FROM AUTHOR] more...
- Published
- 2024
- Full Text
- View/download PDF
Catalog
3. Integration of satellite radar interferometry and civil engineering procedures to assess building and infrastructure conditions
- Author
-
Macchiarulo, Valentina, Blenkinsopp, Christopher, and Reale, Cormac
- Subjects
MT-InSAR ,remote sensing ,deformation monitoring ,bridges ,roadways ,Infrastructure vulnerability ,buildings ,early warning ,settlement ,tunnelling - Abstract
The deterioration of ageing infrastructure assets and the risk of damaging surrounding structures during new construction are major concerns for the transport industry worldwide. Whilst, Structural Health Monitoring (SHM) could assist the lifecycle management of existing assets and the assessment of structures adjacent to large construction projects, the cost of sensors limits the number of structures that can be evaluated. Space-borne Interferometric Synthetic Aperture Radar (InSAR) is a powerful remote-sensing technology which can provide deformation measurements over time for numerous points located on buildings and infrastructure assets. Such measurements are available with an accuracy comparable to traditional in-situ monitoring devices, but at a much lower cost. Furthermore, due to the combination of wide area coverage and high spatial resolution, InSAR can easily shift from local to larger scale, with the potential to provide a cost-effective tool for SHM on a regional level. However, to assess the condition of a given structure, InSAR deformation measurements need to be translated into structural performance indicators. This requires an integration of InSAR displacement measurements and structural information and/or models. Such integration can be particularly demanding for regional analysis, where a vast number of structures needs to be evaluated. The objective of this thesis is to develop a new methodology using InSAR data to monitor and assess the conditions of buildings and infrastructure assets on a regional scale. Such a methodology will allow the understanding of the long-term behaviour of existing infrastructure, and the assessment of damage to existing structures caused by new infrastructure construction. This involved: (i) the definition of performance indicators for the identification of anomalous structural deformations on a large scale; (ii) the integration of InSAR deformation measurements and structural models to interpret the measured deformations in relation to a specific source of movement; (iii) a clear definition of the InSAR challenges that still need to be overcome in order to use the developed methodology as an operational SHM tool. First, a new method using InSAR displacement measurements to evaluate the condition of large transport networks was developed. The proposed method is based on an automated workflow which enables the integration of InSAR deformation measurements and digital databases of roadway and bridge infrastructure to warn of potentially anomalous deformations within a given network. For each asset and roadway segment, the method allows the assessment of monitoring point density, the retrieval of local displacements and velocities, and the identification of anomalous relative movements within the same structure. The developed method provides output maps showing the distribution of PS density, local displacements, velocities and the locations of anomalies. The developed method was tested on the Los Angeles highway and freeway network and on the Italian motorway system, validating its performance from city to national scale. Furthermore, to show the capability of the proposed method of identifying potentially damaging movements, the case of an Italian motorway viaduct that was damaged in 2015 is presented. Second, a new method using InSAR displacement measurements for the structural assessment of buildings adjacent to tunnel excavations was developed. The proposed method is based on an automated workflow which enables the integration of InSAR deformation measurements, digital building databases and structural models of the building response to tunnelling-induced settlements. InSAR displacement measurements were used to estimate the settlement profile for each building. To calculate critical strains for each building, building settlement profiles were analysed through a semi-empirical model. On the basis of the estimated critical strain, a level of damage was assigned to each building. The proposed method provides as outputs damage maps showing the distribution of damage levels for the buildings along the excavation. The developed method was tested on the buildings along the Crossrail tunnel alignment in London, and enabled the identification of structural damage to more than 800 buildings, highlighting its capability as a city-scale assessment tool. The developed integration also provided the first large dataset of field information on building response to tunnelling, enabling the identification of relationships between structural characteristics and building responses. Finally, based on the technical issues encountered during this research and the open problems identified by other researchers, a discussion about the advances needed in InSAR technology to be used as a SHM tool was developed. In this discussion, each InSAR technological limitation was evaluated from a SHM perspective. The challenges that still need to be overcome to use InSAR as an operational tool were defined, with examples showing the practical limitations of InSAR technology. Possible solutions and promising research directions were also identified. The proposed methodology has the potential to inform timely maintenance and prioritisation decisions, and can complement in-situ monitoring instrumentation. Findings can improve current practice for condition monitoring and assessment on large scale, with the possibility to advance the understanding of structural deformation mechanisms. more...
- Published
- 2022
4. Bin Ham Group: Building a Legacy of Excellence in United Arab Emirates Investments
- Author
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Nadheer, Aysha, Alawani, Fatima S., Palalić, Ramo, Aldogan Eklund, Mehtap, Editorial Board Member, Jain, Karuna, Editorial Board Member, Mutum, Dilip S., Editorial Board Member, Shi, Henry, Editorial Board Member, Sigala, Marianna, Editorial Board Member, Alkaabi, Khaula, editor, and Ramadani, Veland, editor more...
- Published
- 2023
- Full Text
- View/download PDF
5. Geosynthetics—Past Findings, Present Trends, and Future Prospects in Road Pavements
- Author
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Rathod, Deendayal, Devahi, P, di Prisco, Marco, Series Editor, Chen, Sheng-Hong, Series Editor, Vayas, Ioannis, Series Editor, Kumar Shukla, Sanjay, Series Editor, Sharma, Anuj, Series Editor, Kumar, Nagesh, Series Editor, Wang, Chien Ming, Series Editor, Muthukkumaran, Kasinathan, editor, Rathod, Deendayal, editor, Sujatha, Evangelin Ramani, editor, and Muthukumar, M., editor more...
- Published
- 2023
- Full Text
- View/download PDF
6. Methane Emission Outbursts in the Mine Face of Two Galleries: Computational Fluid Dynamics Analysis and On-Site Calibration.
- Author
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Torno, Susana and Toraño, Javier
- Subjects
- *
VENTILATION , *GAS explosions , *COMPUTATIONAL fluid dynamics , *UNDERGROUND areas , *METHANE , *ACOUSTIC emission - Abstract
Numerous cases of serious accidents related to methane outbursts exist worldwide. Due to their disastrous consequences, a vast quantity of research on underground gas explosions has been conducted using conventional models and laboratory tests, as performing studies at explosion sites is difficult. When conventional models are employed, the results are poor since these models are based on calculations at fixed times for a single point of a single section of an underground space. Computational fluid dynamics (CFD) analysis is necessary to calibrate these models, using measurements obtained in galleries. In this case, the measurements are obtained from methane emissions of 3885 m3. CFD modelling was carried out in three phases. First, the relationship between methane emission and the main ventilation was analysed. Second, the effect of adding an auxiliary ventilation fan to the main ventilation was investigated. Finally, methane evolution over time was analysed. In the first moments, methane produces a reversal at 200 m from the main ventilation entrance of the gallery. When 60 m of auxiliary ventilation is superimposed, the ventilation reversal distance is reduced to 42 m from the methane emission source. The effect of superimposing appropriate auxiliary ventilation on the main ventilation, as well as the correct placement of the auxiliary ventilation fan, can generate safe zones behind the ventilation reversal area. These CFD models are powerful tools for analysing methane explosion emission and propagation. [ABSTRACT FROM AUTHOR] more...
- Published
- 2023
- Full Text
- View/download PDF
7. Comparison of Imaging Radar Configurations for Roadway Inspection and Characterization.
- Author
-
Wu, Mengda, Ferro-Famil, Laurent, Boutet, Frederic, and Wang, Yide
- Subjects
- *
BISTATIC radar , *SYNTHETIC aperture radar , *RADAR , *GROUND penetrating radar , *ROADS - Abstract
This paper investigates the performance of a wide variety of radar imaging modes, such as nadir-looking B-scan, or side-looking synthetic aperture radar tomographic acquisitions, performed in both back- and forward-scattering geometries, for the inspection and characterization of roadways. Nadir-looking B-scan corresponds to a low-complexity mode exploiting the direct return from the response, whereas side-looking configurations allow the utilization of angular and polarimetric diversity in order to analyze advanced features. The main objective of this paper is to evaluate the ability of each configuration, independently of aspects related to operational implementation, to discriminate and localize shallow underground defects in the wearing course of roadways, and to estimate key geophysical parameters, such as roughness and dielectric permittivity. Campaign measurements are conducted using short-range radar stepped-frequency continuous-waveform (SFCW) devices operated in the C and X bands, at the pavement fatigue carousel of Université Gustave Eiffel, over debonded areas with artificial defects. The results indicate the great potential of the newly proposed forward-scattering tomographic configuration for detecting slight defects and characterizing roadways. Case studies, performed in the presence of narrow horizontal heterogeneities which cannot be detected using classical B-scan, show that both the coherent integration along an aperture using the back-projection algorithm, and the exploitation of scattering mechanisms specific to the forward-looking bistatic geometry, allows anomalous echoes to be detected and further characterized, confirming the efficacy of radar imaging techniques in such applications. [ABSTRACT FROM AUTHOR] more...
- Published
- 2023
- Full Text
- View/download PDF
8. FBG Monitoring of a Communication Paths and Roadways with a Geosynthetic Systems on Mining Heaps
- Author
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Juraszek Janusz, Gwozdz-Lason Monika, Gago Filip, and Bulko Roman
- Subjects
geosynthetics ,civil engineering ,roadways ,fbg monitoring ,market value ,Engineering (General). Civil engineering (General) ,TA1-2040 - Abstract
In civil engineering geosynthetics play the role of reinforcing the ground and strengthening the foundation structures of engineering facilities. This paper shows the possibility of using a geotextile, a geonet and a geogrid for the design of walking, cycle and quad-bike paths in the investigated mine waste dump sites. The functions of the solutions designed for linear investments in areas affected by mining activity and rehabilitated into a sports and recreation area must be monitored. The paper discusses the scope and the method of FBG monitoring, the data of which illustrate the behaviour of structures with embedded geosynthetic materials with regard to variables such as the structure service life and durability and the need to meet all limit states. The impact of the choice of designs with geosynthetics in sustainable development can be quantified in terms of the carbon footprint. A site-rehabilitation working design can also be analysed economically by estimating the market, investment and replacement values of a construction investment. In addition to key technical aspects, the discussed solutions in anthropogenic areas also ensure significant sustainable development of the Benefits system. more...
- Published
- 2023
- Full Text
- View/download PDF
9. A chance encounter in central Texas yields insights on the ecology of aestivating Siren nettingi (Caudata: Sirenidae)
- Author
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Shashwat Sirsi, Ferris E. Zughaiyir, Andrea Villamizar-Gomez, Austin M. A. Bohannon, and Michael R. J. Forstner
- Subjects
Amphibian ,Conservation ,Dormancy ,Dynamic habitat ,Roadways ,Wetland ,Biology (General) ,QH301-705.5 - Abstract
Siren spp. are often dominant vertebrates in the wetlands they occupy and are known to estivate when such wetlands dry up. Practical considerationslimit in-situ observations of estivating individuals. On 12 October 2021, we incidentally discovered an estivating aggregate of Siren nettingi in Bastrop County, Texas, USA. These salamanders were excavated from compact, rocky soil adjacent to a caliche road, at depths that ranged between ~0.2 to 1.5 m. The dominant vegetation at this site included Ulmus crassifolia, Persicaria sp., and various grass species. We recovered 140 individuals of which seven were salvaged and 133 were captured live. We measured 115 of these for snout–vent length (SVL) and observed the aggregate was predominated by juveniles. We estimated an estivation density of 2.33 sirens/m2 that is comparable to densities estimated for non-estivating populations. However, in-lieu of monitoring that was in place for this study, we expect a mass mortality event would have likely occurred. We therefore suggest that roadway construction in preferred habitat be considered as a threat to siren populations. more...
- Published
- 2023
10. Replacing Lime with Rice Husk Ash to Reduce Carbon Footprint of Bituminous Mixtures.
- Author
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Mistry, Raja, Roy, Tapash Kumar, Aldagari, Sand, and Fini, Elham H.
- Subjects
RICE hulls ,ECOLOGICAL impact ,RECYCLING & the environment ,LIME (Minerals) ,COMPOSITE construction ,CALCIUM hydroxide - Abstract
There have been several emphasized pathways toward a reduction in carbon footprint in the built environment such as recycling, technologies with lower energy consumption, and alternative materials. Among alternative materials, bio-based materials and nature inspired solutions have been well-received. This study examines the merits of using rice husk ash as a replacement for lime; lime has a high carbon footprint mainly associated with the decomposition of calcium carbonate to calcium oxide to form lime. Lime is commonly used in bituminous composites for roadway construction to mitigate their susceptibility to moisture damage. Replacing lime with a low-carbon alternative could allow a reduction in CO
2 equivalent of bituminous composites. This paper studies the merits of using rice husk ash (RHA) as a substitute for conventional hydrated lime (HL) in bituminous composites. It should be noted that rice industries burn rice husks in a boiler as fuel, generating a substantial volume of RHA. The disposal of this ash has major environmental impacts associated with the contamination of air and water. Here, we study physical and chemical characteristics of both HL and RHA for use in bitumen mixtures. This was followed by examining the extent of dispersion of each filler in bitumen via optical microscopy to ensure their uniform dispersion. The properties of the mixtures were further studied using the Marshall mix design method. It was found that a 25.67% increase in Marshall stability and a 5.95% decrease in optimum binder content were achieved when HL was replaced by RHA at 4% filler concentration. In addition, mixtures containing RHA exhibited higher resistance to cracking and permanent deformation compared to mixtures containing HL. Additionally, 4% RHA in the mix showed stripping resistance similar to the conventional mix with HL. The mixture with 4% RHA had a lower carbon footprint with enhanced economic and environmental impacts compared to the conventional mix with HL. The study results provide insights pertaining to the merits of bio-based materials to reduce the carbon footprint of pavements. [ABSTRACT FROM AUTHOR] more...- Published
- 2023
- Full Text
- View/download PDF
11. Dams or ponds classification based on a new criterion to assess potential flood damage to roads in case of failure.
- Author
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Martínez-Gomariz, Eduardo, Barbero, Carlos, Sanchez-Juny, Martí, Forero-Ortiz, Edwar, and Sanz-Ramos, Marcos
- Subjects
DAM failures ,FLOOD damage ,DAMS ,FLOOD control ,FISH breeding ,PONDS - Abstract
Dams are hydraulic infrastructure that have several purposes, such as irrigation, hydropower, water supply, flood control, recreation, fish breeding and navigation. However, their failure or malfunctioning can pose a threat to downstream communities, and thus, their safety is paramount to public protection and economic security. A variety of approaches to classify dams can be found in countries worldwide. Their classification allows to distinguish among those that are to be subject to safety regulation in each country. A common approach to classify them is according to their potential damage in case of failure. Roads are usually among the infrastructures that these approaches consider to be assessed in terms of the level of damage that can suffer. A new people-centred criterion is proposed in this paper to assess potential intangible damage (i.e. human lives) when roadways could be flooded due to a dam failure. This novel methodology is based on the Average Daily Traffic (ADT) of roadways and sets a maximum and a minimum number of vehicles expected in the area receiving the flood. To evaluate its appropriateness, it is verified from the results obtained after being applied to three existing ponds located in Catalonia (Spain). [ABSTRACT FROM AUTHOR] more...
- Published
- 2023
- Full Text
- View/download PDF
12. DETERMINATION OF STEEL ARCH SUPPORT DISTANCE FOR ROADWAYS UNDER THE OPEN-PIT MINE: A CASE STUDY AT THE MONG DUONG COAL MINE (VIETNAM).
- Author
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Tien Trung Vu and Doan Viet Dao
- Subjects
COAL mining ,MINES & mineral resources ,COALFIELDS ,STRIP mining ,BENDING moment ,STEEL ,ROADS ,ARCHES ,COMPOSITE columns - Abstract
Purpose. Nowadays, in Quang Ninh coalfield, the mining activity in quarries is increasing. For this purpose, mine roadways are dug and supported. After the mine roadways are dug, they are mainly supported by steel arches. Statistics in fact show that about 85 % of the roadway support structure at the underground coal mines in Quang Ninh are supported by the steel arch support made of SVP profile. The purpose of the study is to calculate and determine a reasonable steel support distance for the roadways located under the open-pit mine to ensure their stability and the safety of exploitation. Methodology. In this study, the numerical simulation method was used. On the basis of Phase2 software and geological conditions of the mine, the authors established a simulation model to determine the pressure acting on the roadway and select a reasonable support distance. Findings. The study considered different steel arch support structure distance following the structure of the rock mass under the 790 open-pit area at the Mong Duong Coal Mine, the internal forces in SVP steel arch support structure distance were also studied for one-lane railway and two-lane railways roadway. From the results of internal forces in the steel support structure, a reasonable SVP-22 steel arch distance was selected, which is 0.7 m for the one-lane railway roadway, as well as SVP-27, which is 0.7 m for the two-lane railway roadway. Originality. Using Phase2 software, the authors created a simulation model of the roadways in Seam L7 located on the West side of Mong Duong Coal Mine, which allowed analyzing and describing the condition of the surrounding rock mass. This study utilized a numerical modeling approach to simulate and establish the bending moment and axial force of both single and double lane railway roadways, across a range of support distances. Based on the results of pressure calculation for the roadways, the authors have selected a reasonable support distance for each corresponding roadway. Practical value. The findings of the study serve as the foundation for the practical application of production methods at the Mong Duong Coal Mine. On the basis of calculating the pressure acting on the roadways at the Seam L7 in the West Side under the 790 open-pit area, the distance of steel arch support was determined, from which the roadway support plan has been developed. This research result will also serve as a basis for other mines with similar geological conditions in Quang Ninh coalfield to consider and apply. [ABSTRACT FROM AUTHOR] more...
- Published
- 2023
- Full Text
- View/download PDF
13. Sustainability Benefits of Adopting Geosynthetics in Roadway Design
- Author
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Zornberg, Jorge G., Subramanian, S., Roodi, Gholam H., Yalcin, Yagizer, and Kumar, V. Vinay
- Published
- 2024
- Full Text
- View/download PDF
14. Rural Development In Thanjor District Through Panchayat Raj Institution In Tamilnadu.
- Author
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Shanthi, S. and Meenakshi, A.
- Subjects
PANCHAYAT ,RURAL development ,INFRASTRUCTURE (Economics) ,EVIDENCE gaps ,RURAL housing - Abstract
Rural infrastructure development is crucial for the growth and well-being of people living in rural areas. The Panchayat Raj Institution has played a significant role in developing rural infrastructure in Thanjavur district, Tamilnadu, India. However, there is still a need to focus on providing better roadways, electricity, communication facilities, water supply and sanitation systems, transportation, and digital connectivity. The study showed that there are several research gaps that need attention for the effective implementation of rural infrastructure development programs. Addressing these gaps will ensure the sustainability of such programs and help achieve their desired outcomes. This study aimed at examining how the Panchayat Raj Institution (PRI) can facilitate rural infrastructure development with special reference to Thanjavur district. 550 is the sample size of the study. Finally, 528 respondents are considered as the sample size for the study. Descriptive statistics, Friedman's multiple comparison tests, and One way ANOVA analysis are used to describe the sample, to show which are factors highly influenced, and to measure the linear association between the dependent and independent variables. Findings suggest that PRI can play a vital role in facilitating sustainable infrastructural developments if implemented effectively while emphasizing researchers' needs towards identifying research gaps surrounding issues related specifically to Roadways, Electricity, Communication, Water supply, Sanitation, Rural housing, and Transportation within targeted locations themselves. [ABSTRACT FROM AUTHOR] more...
- Published
- 2023
15. Methane Emission Outbursts in the Mine Face of Two Galleries: Computational Fluid Dynamics Analysis and On-Site Calibration
- Author
-
Susana Torno and Javier Toraño
- Subjects
methane emission ,CFD model ,roadways ,tunnels ,forced ventilation system ,Technology - Abstract
Numerous cases of serious accidents related to methane outbursts exist worldwide. Due to their disastrous consequences, a vast quantity of research on underground gas explosions has been conducted using conventional models and laboratory tests, as performing studies at explosion sites is difficult. When conventional models are employed, the results are poor since these models are based on calculations at fixed times for a single point of a single section of an underground space. Computational fluid dynamics (CFD) analysis is necessary to calibrate these models, using measurements obtained in galleries. In this case, the measurements are obtained from methane emissions of 3885 m3. CFD modelling was carried out in three phases. First, the relationship between methane emission and the main ventilation was analysed. Second, the effect of adding an auxiliary ventilation fan to the main ventilation was investigated. Finally, methane evolution over time was analysed. In the first moments, methane produces a reversal at 200 m from the main ventilation entrance of the gallery. When 60 m of auxiliary ventilation is superimposed, the ventilation reversal distance is reduced to 42 m from the methane emission source. The effect of superimposing appropriate auxiliary ventilation on the main ventilation, as well as the correct placement of the auxiliary ventilation fan, can generate safe zones behind the ventilation reversal area. These CFD models are powerful tools for analysing methane explosion emission and propagation. more...
- Published
- 2023
- Full Text
- View/download PDF
16. Comparison of Imaging Radar Configurations for Roadway Inspection and Characterization
- Author
-
Mengda Wu, Laurent Ferro-Famil, Frederic Boutet, and Yide Wang
- Subjects
synthetic aperture radar (SAR) ,ground-penetrating radar (GPR) ,ground-based SAR (GB-SAR) ,tomographic SAR (TomoSAR) ,roadways ,artificial defects ,Chemical technology ,TP1-1185 - Abstract
This paper investigates the performance of a wide variety of radar imaging modes, such as nadir-looking B-scan, or side-looking synthetic aperture radar tomographic acquisitions, performed in both back- and forward-scattering geometries, for the inspection and characterization of roadways. Nadir-looking B-scan corresponds to a low-complexity mode exploiting the direct return from the response, whereas side-looking configurations allow the utilization of angular and polarimetric diversity in order to analyze advanced features. The main objective of this paper is to evaluate the ability of each configuration, independently of aspects related to operational implementation, to discriminate and localize shallow underground defects in the wearing course of roadways, and to estimate key geophysical parameters, such as roughness and dielectric permittivity. Campaign measurements are conducted using short-range radar stepped-frequency continuous-waveform (SFCW) devices operated in the C and X bands, at the pavement fatigue carousel of Université Gustave Eiffel, over debonded areas with artificial defects. The results indicate the great potential of the newly proposed forward-scattering tomographic configuration for detecting slight defects and characterizing roadways. Case studies, performed in the presence of narrow horizontal heterogeneities which cannot be detected using classical B-scan, show that both the coherent integration along an aperture using the back-projection algorithm, and the exploitation of scattering mechanisms specific to the forward-looking bistatic geometry, allows anomalous echoes to be detected and further characterized, confirming the efficacy of radar imaging techniques in such applications. more...
- Published
- 2023
- Full Text
- View/download PDF
17. Solar Roadways: A Road Toward Betterment
- Author
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Arpit, Ferwani, Richa, Gupta, Swikrati, Bansal, Jagdish Chand, Series Editor, Deep, Kusum, Series Editor, Nagar, Atulya K., Series Editor, Goyal, Dinesh, editor, Chaturvedi, Pradyumn, editor, and Purohit, S.D., editor more...
- Published
- 2021
- Full Text
- View/download PDF
18. Evidence-based traffic engineering measures to reduce pedestrian motor vehicle collisions: A review
- Author
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Rathore, Rahul
- Published
- 2021
- Full Text
- View/download PDF
19. Řešení dopravních a manipulačních ploch v lomu Košťálov
- Author
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Šmejda, Aleš, Žaba, Pavel, Linek, Aleš, Šmejda, Aleš, Žaba, Pavel, and Linek, Aleš
- Abstract
Práce se zabývá návrhem rozšíření stávající manipulační plochy pro vnik nových deponií těženého materiálu v daném lomu. Navržení pozemních komunikací a zatrubněním údolí potoka., The work deals with the design of the extension of the existing handling area for the entry of new deposits of mined material in the given quarry. Design of roads and piping of stream valleys., Dopravní fakulta Jana Pernera, Uchazeč stručně seznámil komisi se svou diplomovou prací. Po prezentaci hlavních výsledků a závěrů diplomové práce zodpověděl dotazy vedoucího a připomínky oponenta diplomové práce (uvedeny v posudcích práce). V diskusi o diplomové práci stručně zodpověděl všechny dotazy členů komise., Dokončená práce s úspěšnou obhajobou more...
- Published
- 2024
20. Evaluation and development of tools to quantify the impacts of roadside vegetation barriers on near-road air quality.
- Author
-
Isakov, Vlad, Venkatram, Akula, Baldauf, Richard, Deshmukh, Parikshit, and Zhang, Max
- Subjects
Engineering ,Environmental Sciences ,Pollution and Contamination ,2.2 Factors relating to the physical environment ,Aetiology ,Good Health and Well Being ,roadways ,barriers ,vegetation ,dispersion ,models ,Commerce ,Management ,Tourism and Services ,Commerce ,management ,tourism and services ,Environmental sciences - Abstract
Traffic emissions are associated with the elevation of health risks of people living close to highways. Roadside vegetation barriers have the potential of reducing these risks by decreasing near-road air pollution concentrations. However, while we understand the mechanisms that determine the mitigation caused by solid barriers, we still have questions about how vegetative barriers affect dispersion. The US EPA conducted several field experiments to understand the effects of vegetation barriers on dispersion of pollutants near roadways (e.g., 2008 North Carolina study and 2014 California study) that indicate the reduction of near-road pollutant concentrations can be up to 30% due to the barrier effects. The results of these field studies are being used to develop and evaluate dispersion models that account for the effects of near-road vegetative barriers. These models can be used for evaluating the effectiveness of vegetation barriers as a potential mitigation strategy to reduce exposure to traffic-related pollutants and their associated adverse health effects. This paper presents the results of the analysis of the field studies and discusses dispersion models being used to describe the data in order to simulate the effects of near-road barriers and to develop recommendations for model improvements. more...
- Published
- 2017
21. Stormwater Management and Roadways
- Author
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Pickering, Nigel and Nassiri, Somayeh
- Published
- 2021
- Full Text
- View/download PDF
22. Flexible Planning for Intercity Multimodal Transport Infrastructure.
- Author
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Hadjidemetriou, Georgios M., Teal, Jacob, Kapetas, Leon, and Parlikad, Ajith K.
- Subjects
INFRASTRUCTURE (Economics) ,RAILROADS ,CHOICE of transportation ,INFORMATION resources ,DECISION making ,RAILROAD travel - Abstract
Planning transport infrastructure development involves high levels of uncertainty due to socioeconomic, environmental, and technological changes. Methodologies currently used in transport planning often have minimal consideration for adaptiveness, leading to costly redesigns or cancellation of entire projects. Presented herein is the investigation of the applicability of dynamic adaptive policy pathways, which is a methodology predominantly used in the field of flood-risk planning, to long-term transport infrastructure planning. Specifically, the paper investigates whether this methodology could facilitate ongoing adaptation to variations in service demand and capacity. It demonstrates this by examining future demand and capacity of road and rail travel between Manchester, United Kingdom, and London using publicly available data and information sources. The study shows that dynamic adaptive policy pathways is useful for identifying periods of time of significant capacity vulnerability for the examined transport network in the coming decade. The method is demonstrated to be valuable for identifying the points in time when policy-makers will have to make decisions and for assessing the impact of transport mode switching. This can have implications of cost-saving and improved service delivery. [ABSTRACT FROM AUTHOR] more...
- Published
- 2022
- Full Text
- View/download PDF
23. Full Depth Reclamation (FDR) to Repair Road Damaged in the Energy Sector
- Author
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Chen, Dar Hao, Scullion, Tom, Li, Kun, Shehata, Hany Farouk, Editor-in-chief, ElZahaby, Khalid M., Advisory editor, Chen, Dar Hao, Advisory editor, and Mohammad, Louay, editor
- Published
- 2018
- Full Text
- View/download PDF
24. TXT-tool 4.034-1.1: Quantitative Rockfall Risk Assessment for Roadways and Railways
- Author
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Mavrouli, Olga, Corominas, Jordi, Sassa, Kyoji, editor, Tiwari, Binod, editor, Liu, Ko-Fei, editor, McSaveney, Mauri, editor, Strom, Alexander, editor, and Setiawan, Hendy, editor
- Published
- 2018
- Full Text
- View/download PDF
25. Geografía y vías de comunicación en Sudamérica. Apuntes para un estudio desde Bolivia.
- Author
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López Beltrán, Clara
- Abstract
Copyright of Revista de Historia Americana y Argentina is the property of Universidad Nacional de Cuyo 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.) more...
- Published
- 2021
- Full Text
- View/download PDF
26. Bone fractures in roadkill Northern Tamandua Tamandua mexicana (Mammalia: Pilosa: Myrmecophagidae) in Costa Rica
- Author
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Randall Arguedas, Elisa C. López, and Lizbeth Ovares
- Subjects
anteater ,car accidents ,radiology ,roadways ,wildlife mortality ,Ecology ,QH540-549.5 ,General. Including nature conservation, geographical distribution ,QH1-199.5 - Abstract
Northern Tamandua Tamandua mexicana is one of the most common roadkill species encountered on Costa Rican highways. Ten roadkill Northern Tamanduas were collected along different roads in Costa Rica and moved to a veterinary facility where appendicular radiologic studies were undertaken. The number of fractures present in each individual varied from zero to five (mean=2.6), with only one animal sustaining no fractures at all. Most fractures were present in the humerus (31%), followed by the ulna and ilium (both 19%), whilst the cranial portion of the body represented the highest number of fractures (61%). These data can contribute, not only to establishing causes of animal-road-mortalities, but also to the future understanding and decision-making of clinical actions for animals injured on the roads. more...
- Published
- 2019
- Full Text
- View/download PDF
27. Peripheral Visions, or Paris Orbital
- Author
-
Blatt, Ari J., author
- Published
- 2022
- Full Text
- View/download PDF
28. Propagation of gas explosions in roadways with different cross-sectional shapes.
- Author
-
Jinzhang, Jia and Fengxiao, Wang
- Subjects
- *
GAS explosions , *ROADS , *LOW temperatures , *HIGH temperatures , *FLAME - Abstract
To explore the propagation of gas explosions in roadways, test pipes with circular, square, rectangular, and trapezoidal cross-sections were used to monitor the temperature and pressure changes. The results showed the longest time was required for the flame to fill the roadway with a trapezoidal cross-section. The highest temperature was observed for the square cross-section. The maximum explosion pressures in the roadways was about 0.6 MPa, but the longest time was required in the roadway with a trapezoidal cross-section, while the gas explosion temperature was the lowest, and the time to reach the maximum explosion pressure was the longest. [ABSTRACT FROM AUTHOR] more...
- Published
- 2021
- Full Text
- View/download PDF
29. Evaluación de daños en pavimento flexible usando fotogrametría terrestre y redes neuronales.
- Author
-
Tello-Cifuentes, Lizette, Aguirre-Sánchez, Marcela, Díaz-Paz, Jean P., and Hernández, Francisco
- Published
- 2021
- Full Text
- View/download PDF
30. Agricultural tractors conformity to the Brazilian traffic lighting and signaling legislation
- Author
-
Sabrina Dalla Corte Bellochio, Airton dos Santos Alonço, Tiago Rodrigo Francetto, and Lutiane Pagliarin
- Subjects
agricultural mechanization ,safety ,roadways ,Agriculture ,Agriculture (General) ,S1-972 - Abstract
ABSTRACT: Increasing the agricultural machinery visibility makes public roadways traffic safer by reducing the number of accidents and their severity. The study aimed to verify the compliance of new agricultural tractors with Brazilian law, given by, CONTRAN Resolution N° 454, NR12 and NR31, regarding the presence of lighting and signaling elements for traffic. The study was carried out in agricultural machinery dealers of seven brands, corresponding to 50 different models of new wheeled agricultural tractors. The items that was not present in total tractors sample are the rear position lamp, the reverse light and the rear retro-reflector. In addition, only one of the seven brands studied showed complete compliance with evaluated elements. Although, the Brazilian legislation specify the presence of lighting and signaling items for agricultural tractors traffic, there is not fully comply on tractors models analyzed and the Brazilian law are not homogeneously met by the agricultural tractor manufacturers in the verified sample, what can be leading to tractors traffic accident occurrences. more...
- Published
- 2020
- Full Text
- View/download PDF
31. Materials science appraisal of recycled construction materials for roadways
- Author
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Ogwuda, Olisanwendu Ikechukwuka, Oduyemi, Kehinde O. K., and Fordyce, Derek
- Subjects
625.7 ,Roadways ,Recycled material - Abstract
This thesis reports on a materials science appraisal for recycled construction materials in roadways, that supports engineering decision-making. Inconsistent performance criteria for roadway materials and the variable nature of material source have prompted the need for this research. The aim of the study is to investigate the application of a materials science appraisal to recycled construction materials for use in roadways. The investigation is undertaken through a literature review of roadways, conceptual development of the materials science appraisal methodology, and demonstration of the application of the materials science appraisal to recycled construction materials; and how this supports engineering decision-making. The literature review revealed that there are numerous and proven uses of recycled and secondary materials in roadway applications but there was a lack of necessary integration of materials into categories by material-type, which can better describe behaviour in an engineering situation. Three novel fundamental material types (ceramic, metallic, and polymeric) have been described. The conceptual development of the innovative and novel materials science appraisal, based on material-type, has defined how materials science through a systematic step-by-step procedure can be used to achieve engineering sustainability in roadways and provide support in engineering decision-making. The application of the novel concept of the materials science appraisal to recycled construction materials is shown through the essence of laboratory testing. The results from the materials science appraisal, together with sensitivity analysis, give an informed engineering decision on product choice. The appraisal is novel in that it is proposing a new theory on materials science and developed a paradigm shift in the evaluation of recycled construction materials. The appraisal overcomes the absence of materials science thinking in the field of roadway engineering. The materials science appraisal is of benefit to various stakeholders (client, consultant, supplier and contractor) as it provides a method for addressing material uncertainties. A system now exists for introducing into designs and any contract the principles of the materials science appraisal that will be of great benefit to industry. more...
- Published
- 2007
32. Agricultural tractors conformity to the Brazilian traffic lighting and signaling legislation.
- Author
-
Corte Bellochio, Sabrina Dalla, dos Santos Alonço, Airton, Rodrigo Francetto, Tiago, and Pagliarin, Lutiane
- Subjects
- *
TRAFFIC signs & signals , *CONFORMITY , *TRAFFIC accidents , *FARM tractors , *AGRICULTURAL equipment , *LIGHT elements - Abstract
Increasing the agricultural machinery visibility makes public roadways traffic safer by reducing the number of accidents and their severity. The study aimed to verify the compliance of new agricultural tractors with Brazilian law, given by, CONTRAN Resolution N° 454, NR12 and NR31, regarding the presence of lighting and signaling elements for traffic. The study was carried out in agricultural machinery dealers of seven brands, corresponding to 50 different models of new wheeled agricultural tractors. The items that was not present in total tractors sample are the rear position lamp, the reverse light and the rear retro-reflector. In addition, only one of the seven brands studied showed complete compliance with evaluated elements. Although, the Brazilian legislation specify the presence of lighting and signaling items for agricultural tractors traffic, there is not fully comply on tractors models analyzed and the Brazilian law are not homogeneously met by the agricultural tractor manufacturers in the verified sample, what can be leading to tractors traffic accident occurrences. [ABSTRACT FROM AUTHOR] more...
- Published
- 2020
- Full Text
- View/download PDF
33. Piezoelectric energy harvesting from roadway deformation under various traffic flow conditions.
- Author
-
Zhang, Yangyang, Zhang, He, Lü, Chaofeng, Chen, Yisheng, and Wang, Ji
- Subjects
ENERGY harvesting ,TRAFFIC flow ,TRAFFIC speed ,TRAFFIC patterns ,TRAFFIC density ,TRAFFIC regulations - Abstract
Many laboratory tests and in situ measurements have been conducted to study piezoelectric energy harvesting from roadway deformation. However, the performance of piezoelectric energy harvesters under real traffic flow conditions is still unknown. In this study, an electromechanical model of piezoelectric energy harvesters with detailed parameters (including the geometric parameters, material parameters, and circuits) is established, and the influences of traffic flow conditions (i.e. traffic speed and traffic density) on the output power of piezoelectric energy harvesters are analyzed by employing a scaling law method and traffic flow theory. The results indicate that remarkable differences exist in the load patterns and the frequencies between the laboratory tests (or in situ measurements) and real traffic flow conditions. Because of these differences, the results (especially the output electric power and optimization design methods) of previous studies may be inapplicable for piezoelectric energy harvesters embedded in roadways. Considering the distinguishing features of the traffic load pattern, the optimization criteria to determine the geometric parameters and the intrinsic system parameter of piezoelectric energy harvesters are obtained, and the corresponding optimal output power densities of the piezoelectric energy harvesters are also quantitatively calibrated. These theoretical results may serve as guidelines for optimizing the design of piezoelectric energy harvesters embedded in roadways under different traffic flow conditions. [ABSTRACT FROM AUTHOR] more...
- Published
- 2020
- Full Text
- View/download PDF
34. CONSIDERATIONS CONCERNING THE EVALUATION OF TOWING FORCES FOR ROAD TRANSPORTATION OF AGABARITICAL MECHANICAL EQUIPMENT.
- Author
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IATAN, RADU, STATESCU, MIHAI, DURBACA, ION, and ENACHESCU, GEORGIANA LUMINITA
- Subjects
AUTOMOTIVE transportation ,WIND pressure ,INDUSTRIAL safety ,INDUSTRIAL equipment ,BIBLIOGRAPHY ,FOOD transportation - Abstract
Abstract. The full safety of operating industrial mechanical equipment, in particular the over-sized ones, with a complex structure, is ensured by compliance with all necessary requirements, starting with design, fabrication, transportation from the supplier to the recipient and operation within the working parameters. The present article that is continuing the analysis of transportation stages of over-sized and heavy equipment, as can be seen from the attached bibliography, takes into consideration the evaluation of the towing forces, in the case of two distant platforms. The masses of the transported components, the characteristics of the roadways, as well as the character of the movement and the influence of the wind loads are considered. [ABSTRACT FROM AUTHOR] more...
- Published
- 2020
- Full Text
- View/download PDF
35. Dams or ponds classification based on a new criterion to assess potential flood damage to roads in case of failure
- Author
-
Universitat Politècnica de Catalunya. Departament d'Enginyeria Civil i Ambiental, Universitat Politècnica de Catalunya. Doctorat en Enginyeria Civil, Universitat Politècnica de Catalunya. Institut en Dinàmica Fluvial i Enginyeria Hidrològica, Universitat Politècnica de Catalunya. Geo2Aqua - Monitoring, modelling and geomatics for hydro-geomorphological processes, Martínez Gomariz, Eduardo, Barbero Lartigau, Carlos, Sánchez Juny, Martí, Forero Ortiz, Edwar Andres, Sanz Ramos, Marcos, Universitat Politècnica de Catalunya. Departament d'Enginyeria Civil i Ambiental, Universitat Politècnica de Catalunya. Doctorat en Enginyeria Civil, Universitat Politècnica de Catalunya. Institut en Dinàmica Fluvial i Enginyeria Hidrològica, Universitat Politècnica de Catalunya. Geo2Aqua - Monitoring, modelling and geomatics for hydro-geomorphological processes, Martínez Gomariz, Eduardo, Barbero Lartigau, Carlos, Sánchez Juny, Martí, Forero Ortiz, Edwar Andres, and Sanz Ramos, Marcos more...
- Abstract
Dams are hydraulic infrastructure that have several purposes, such as irrigation, hydropower, water supply, flood control, recreation, fish breeding and navigation. However, their failure or malfunctioning can pose a threat to downstream communities, and thus, their safety is paramount to public protection and economic security. A variety of approaches to classify dams can be found in countries worldwide. Their classification allows to distinguish among those that are to be subject to safety regulation in each country. A common approach to classify them is according to their potential damage in case of failure. Roads are usually among the infrastructures that these approaches consider to be assessed in terms of the level of damage that can suffer. A new people-centred criterion is proposed in this paper to assess potential intangible damage (i.e. human lives) when roadways could be flooded due to a dam failure. This novel methodology is based on the Average Daily Traffic (ADT) of roadways and sets a maximum and a minimum number of vehicles expected in the area receiving the flood. To evaluate its appropriateness, it is verified from the results obtained after being applied to three existing ponds located in Catalonia (Spain)., Peer Reviewed, Postprint (published version) more...
- Published
- 2023
36. Quantitative Rockfall Risk Assessment in the Roadways of Gipuzkoa
- Author
-
Corominas, Jordi, Mavrouli, Olga, Lollino, Giorgio, editor, Giordan, Daniele, editor, Crosta, Giovanni B., editor, Corominas, Jordi, editor, Azzam, Rafig, editor, Wasowski, Janusz, editor, and Sciarra, Nicola, editor more...
- Published
- 2015
- Full Text
- View/download PDF
37. Identifying the best locations to provide safe highway crossing opportunities for wildlife
- Author
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Barnum, Sarah
- Subjects
safe ,opportunities ,cross ,road ,roadways ,crossway ,mitigation ,crossing ,highway ,crossings - Abstract
Providing mid- and large-sized mammals with safe opportunities to cross roadways can reduce the impacts of highways on wildlife. To maximize effectiveness, this type of mitigation must be placed in locations where animals naturally approach and cross the highway. Results of a study funded by the Colorado Department of Transportation indicate that mid- and large-sized mammals focus crossing activity at specific locations that are correlated to features of the surrounding habitat and the roadway itself. Therefore, both the design of a highway and its placement in the landscape should be considered when creating mitigation projects to help wildlife safely cross a highway. It is important to note that no single set of variables identifies all preferred crossing locations. Because every landscape and every highway is unique, identifying the best location for each mitigation project must be approached individually. However, the study results suggest a set of guidelines, comprising the following: (1) use habitat suitability as the primary indicator of crossing activity; (2) consider how landscape structure interacts with habitat suitability to either increase or decrease the level of use an area of suitable habitat receives by a particular species; (3) consider how the design of the existing highway interacts with habitat suitability and landscape structure to influence crossing behavior; (4) synthesize this information by mapping the landscape and roadway features/conditions likely to be associated with crossing or that are attractive/repellant to the species present. Use these maps to identify the most likely crossing locations. Finally, because the preferred habitat and behavior of a given species can vary across its range, it is important to employ professionals familiar with the landscapes and species of concern on the analysis team. more...
- Published
- 2003
38. Research and Development of Bio-Degasification Technologies for Coal Fields.
- Author
-
Kurlenya, M. V., Emel'yanova, E. K., Andreeva, I. S., and Savchenko, A. V.
- Subjects
- *
RESEARCH & development , *METHANOTROPHS , *COALBED methane drainage , *COALFIELDS , *HYDRAULIC fracturing - Published
- 2019
- Full Text
- View/download PDF
39. Influence of the Bachatsky Earthquake on Methane Emission in Roadways in Coal Mines.
- Author
-
Kurlenya, M. V., Tsupov, M. N., and Savchenko, A. V.
- Subjects
- *
COAL reserves , *PENINSULAS , *EARTHQUAKES , *METHANE content of soils , *SEISMIC waves - Published
- 2019
- Full Text
- View/download PDF
40. EFFECTS OF LINING JOINTS ON THE STABILITY OF ROADWAYS IN VIETNAMESE COAL MINES.
- Author
-
Tran Tuan Minh and Do Quang Tuan
- Subjects
STRAINS & stresses (Mechanics) ,PRECAST concrete ,COAL mining - Abstract
Using heavy supports with a high bearing capacity of the load by precast concrete lining is a limited problem in other underground mines in Viet Nam. This solution avoids the excavation for expansion and increases the stability of roadways during operation. Most of the cases reported in the literature focus on considering the effect of geological conditions, roadway size, the depth of roadways, and excavation methods on the stability of roadways in a continuous rock mass with behaviors of isotropic and linear-elastic. In addition, these reports only consider the types of supports such as rock bolts, steel ribs, shotcrete and the combination of these supports. These cases also do not consider the effect of joints between segments in the precast concrete lining and roadways excavated in bedding rocks. This paper introduces the analysis of the stability of roadways in weak rocks using precast concrete lining base on using a two-dimensional finite element model in the Quang Ninh underground mines of Viet Nam. The results show a certain influence of joint distribution, joint number on the stability of roadways in the continuous and bedding rock mass. [ABSTRACT FROM AUTHOR] more...
- Published
- 2019
- Full Text
- View/download PDF
41. Roadways fracture response under varying dominant blasting frequencies and lateral pressure coefficients.
- Author
-
Si, Yingtao, Liu, Jianpo, Li, Fengtian, Wang, Yongxin, Song, Jiancun, and Zhao, Fuquan
- Subjects
- *
BLAST effect , *BLAST waves , *DISCRETE element method , *MICROCRACKS , *ACOUSTIC emission , *STRESS waves , *BLASTING - Abstract
• Microcracks inside the rock mass induced by repeated blast loading were obtained by using acoustic emission and discrete element methods. • Microcracks behaviors in response to varying blast waveform frequencies and geo-stresses are investigated. • The difference in damage-prone regions induced by static loading and blast disturbance is analyzed. Dominant frequency of blasting waveform attenuates with increasing propagation distance, leading to diverse diffractive effects on a roadway located in different sublevels. To investigate the roadway fracture characteristics in response to varying blasting wave frequencies and geo-stresses. Numerical simulation and experiments were performed by using discrete element methods and acoustic emission (AE) techniques, respectively. Roadway response differences in terms of microcracks propagation regions were primarily investigated, to reveal the relationships between damage-prone regions and the lateral pressure coefficient and blast waveform frequencies. The results showed that the excavation damage zone (EDZ) and the types of microcracks developed are primarily influenced by the principal stress direction. Low-frequencies blast waves contribute significantly to the overall damage to the surrounding rock around the roadway, while high-frequencies blast waves mainly damage the sides of the facing blast. Under the coupling effect of principal stress and blast wave, microcracks are more prone to generate in regions coupling with high-stress concentration regions induced by principal stress and disturbed regions diffracted by blast waves. With the results from this study, the roadway support should consider the difference in damage-prone regions triggered by blasting waves with varying dominant frequencies under different lateral pressure coefficients. [ABSTRACT FROM AUTHOR] more...
- Published
- 2023
- Full Text
- View/download PDF
42. Replacing Lime with Rice Husk Ash to Reduce Carbon Footprint of Bituminous Mixtures
- Author
-
Raja Mistry, Tapash Kumar Roy, Sand Aldagari, and Elham H. Fini
- Subjects
General Medicine ,sustainability ,carbon footprint ,rice husk ash ,lime ,silica ,asphalt ,concrete ,roadways - Abstract
There have been several emphasized pathways toward a reduction in carbon footprint in the built environment such as recycling, technologies with lower energy consumption, and alternative materials. Among alternative materials, bio-based materials and nature inspired solutions have been well-received. This study examines the merits of using rice husk ash as a replacement for lime; lime has a high carbon footprint mainly associated with the decomposition of calcium carbonate to calcium oxide to form lime. Lime is commonly used in bituminous composites for roadway construction to mitigate their susceptibility to moisture damage. Replacing lime with a low-carbon alternative could allow a reduction in CO2 equivalent of bituminous composites. This paper studies the merits of using rice husk ash (RHA) as a substitute for conventional hydrated lime (HL) in bituminous composites. It should be noted that rice industries burn rice husks in a boiler as fuel, generating a substantial volume of RHA. The disposal of this ash has major environmental impacts associated with the contamination of air and water. Here, we study physical and chemical characteristics of both HL and RHA for use in bitumen mixtures. This was followed by examining the extent of dispersion of each filler in bitumen via optical microscopy to ensure their uniform dispersion. The properties of the mixtures were further studied using the Marshall mix design method. It was found that a 25.67% increase in Marshall stability and a 5.95% decrease in optimum binder content were achieved when HL was replaced by RHA at 4% filler concentration. In addition, mixtures containing RHA exhibited higher resistance to cracking and permanent deformation compared to mixtures containing HL. Additionally, 4% RHA in the mix showed stripping resistance similar to the conventional mix with HL. The mixture with 4% RHA had a lower carbon footprint with enhanced economic and environmental impacts compared to the conventional mix with HL. The study results provide insights pertaining to the merits of bio-based materials to reduce the carbon footprint of pavements. more...
- Published
- 2023
- Full Text
- View/download PDF
43. Dams or ponds classification based on a new criterion to assess potential flood damage to roads in case of failure
- Author
-
Eduardo Martínez-Gomariz, Carlos Barbero, Martí Sanchez-Juny, Edwar Forero-Ortiz, Marcos Sanz-Ramos, Universitat Politècnica de Catalunya. Departament d'Enginyeria Civil i Ambiental, Universitat Politècnica de Catalunya. Doctorat en Enginyeria Civil, Universitat Politècnica de Catalunya. Institut en Dinàmica Fluvial i Enginyeria Hidrològica, and Universitat Politècnica de Catalunya. Geo2Aqua - Monitoring, modelling and geomatics for hydro-geomorphological processes more...
- Subjects
Atmospheric Science ,Inundacions -- Avaluació del risc ,Vehicles' safety ,Earth and Planetary Sciences (miscellaneous) ,Flood damage prevention ,Enginyeria civil::Enginyeria hidràulica, marítima i sanitària [Àrees temàtiques de la UPC] ,Roadways ,Safety ,Potential damage ,Dams ,Water Science and Technology - Abstract
Dams are hydraulic infrastructure that have several purposes, such as irrigation, hydropower, water supply, flood control, recreation, fish breeding and navigation. However, their failure or malfunctioning can pose a threat to downstream communities, and thus, their safety is paramount to public protection and economic security. A variety of approaches to classify dams can be found in countries worldwide. Their classification allows to distinguish among those that are to be subject to safety regulation in each country. A common approach to classify them is according to their potential damage in case of failure. Roads are usually among the infrastructures that these approaches consider to be assessed in terms of the level of damage that can suffer. A new people-centred criterion is proposed in this paper to assess potential intangible damage (i.e. human lives) when roadways could be flooded due to a dam failure. This novel methodology is based on the Average Daily Traffic (ADT) of roadways and sets a maximum and a minimum number of vehicles expected in the area receiving the flood. To evaluate its appropriateness, it is verified from the results obtained after being applied to three existing ponds located in Catalonia (Spain). more...
- Published
- 2023
44. Engineering Tests to Evaluate the Feasibility of an Emerging Solar Pavement Technology for Public Roads and Highways
- Author
-
Ronald A. Coutu Jr., David Newman, Mohiuddin Munna, Joseph H. Tschida, and Scott Brusaw
- Subjects
roadways ,pavements ,solar energy ,mechanical testing ,shear testing ,renewable energy ,Technology - Abstract
Concrete and asphalt are the primary materials used to construct roadways for motor vehicles, paths for pedestrians and bicyclists, and runways for aircraft. Solar Roadways®, Inc. (SR) proposed a novel solar pavement technology (i.e., solar road panels (SRP)) as an alternative material and energy source. SR performed load, traction, and impact testing to use SRPs in non-critical applications like parking lots. To use SRP in public roads, engineering tests including freeze/thaw, moisture absorption, heavy vehicle, and shear testing were accomplished on “SR3” prototypes. Testing was performed at Marquette University in the Engineering Materials and Structural Testing Laboratory and the SR Pilot Project area. Moisture absorption and freeze/thaw tests showed “SR3” resistant to extreme weather and moisture environments. Heavy vehicle testing revealed no physical damage to the “SR3” after approximately 989,457 equivalent single axle loads were continuously rolled over a prototype pavement. Shear testing was conducted to investigate “SR3” laminate structure properties. In all cases, electrical failure was defined when “SR3” photovoltaic voltage dropped to zero volts. The maximum shear stress and applied torque for “SR3”’ (S/N’s Paver 1, 002B, 007C, and 004B) were 1756 kPa, 1835 kPa, 1643 kPa, 2023 kPa; and 121.2 kN·m, 131.3 kN·m, 117.6 kN·m, 144.8 kN·m, respectively. In addition, the “SR3” “heartbeat” light emitting diode (LED) remained operational (i.e., indicates computer bus traffic) in all phases of shear testing. Overall, the results show “SR3” prototypes to be robust, resilient, and functional when subjected to “real-world” test conditions. more...
- Published
- 2020
- Full Text
- View/download PDF
45. Caminhos das águas, caminhos de terra: trilhando o território alagoano através dos mapas nos primeiros séculos coloniais
- Author
-
MARIA ANGÉLICA DA SILVA, BIANCA MACHADO MUNIZ, and CATARINA AGUDO MENEZES
- Subjects
17th century cartography ,Territorial formation of Alagoas ,Roadways ,Dutch iconography ,Latin America. Spanish America ,F1201-3799 - Abstract
RESUMO No período colonial, as terras denominadas Alagoas inicialmente pertenciam à capitania de Pernambuco. Contudo, sinais da sua geografia já são encontrados nos primeiros mapas que representam o Brasil. Através da cartografia portuguesa da família Albernaz e, depois, da extensa produção holandesa, pode-se acompanhar como a região vai sendo desenhada - a princípio pela marcação dos acidentes geográficos, em especial os rios, mas depois pela identificação de vilas, caminhos e engenhos. Na série aqui analisada destaca-se a carta Brasiliae Geographica et Hidrographica Tabula Nova..., habilmente produzida por George Marcgraf, o mais importante documento cartográfico seiscentista, realizado no período do denominado Brasil holandês. Somam-se a ele as vistas de Frans Post, que permitem tratar das três primeiras vilas fundadas na região. Entre os pontos que se observam estão os caminhos. Inicialmente hidrográficos, depois passam a ser recortados terras adentro. Comparando-se esse antigo material cartográfico com o atual, pode-se comprovar que algumas dessas trilhas, hoje assumindo a proporção de rodovias, chegam até os dias de hoje. Território identificado pelas marcas lagunares, a análise sobre Alagoas finaliza-se com o estudo das suas três vilas iniciais, seguido de apontamentos sobre a capital, Maceió, conduzidos a partir do mapa mais antigo da cidade até agora encontrado, produzido no século XVIII, no qual novamente salientam-se as águas e os caminhos. more...
- Published
- 2018
- Full Text
- View/download PDF
46. Roadway Stability Evaluation on the Basis of Modern Monitoring of Displacement
- Author
-
Majcherczyk Tadeusz, Niedbalski Zbigniew, and Ulaszek Artur
- Subjects
roadways ,monitoring ,convergence ,Engineering geology. Rock mechanics. Soil mechanics. Underground construction ,TA703-712 - Abstract
The paper presents the application of a 3D laser measurement technology in a modern monitoring of roadways. The authors analyze the possibility of using a three-dimensional scanning measurement of longwall working dimensions. The measurement results are presented in the form of a cloud of points obtained from a 3D laser scanning. The paper also presents a comparison of the results obtained from the convergence of traditionally-made measurements with the measurements derived from the threedimensional scanning and discusses possible methods of comparing different point clouds. more...
- Published
- 2015
- Full Text
- View/download PDF
47. INFLUENCE OF THE STRATIFICATION IN ROCK MASS ON THE STABILITY OF ROADWAYS IN VIETNAMESE COAL MINES.
- Author
-
Minh, Tran Tuan
- Subjects
ROCK mechanics ,COAL mining ,EXCAVATION - Abstract
When the excavation of roadways in the rock mass for underground mining the state of initial stress in the rock mass will be changed, otherwise established the new stress state in rock mass (the secondary stress state after excavation) around openings, respectively. The secondary stress state in rock mass has influence on the design and stability of roadways. Recently the estimation values of stress and deformation around roadways in underground mines when they are excavated in bedding rocks is limited problem. One of many factors concerns to the values and directions of the earth pressure on the steel supports is ratio between span of roadways and thickness of rock mass layers. This paper introduces the assessment of the stress and deformation around roadways and internal forces in the steel supports to determinate suitable locations of the friction joints of steel ribs in the roadways when consideration to change span ratio of roadways and thickness of rock mass layers in bedding rocks in the Quang Ninh underground mines of Viet Nam. [ABSTRACT FROM AUTHOR] more...
- Published
- 2018
- Full Text
- View/download PDF
48. Effect of Sediment Accumulation on Best Management Practice (BMP) Stormwater Runoff Volume Reduction Performance for Roadways.
- Author
-
Osouli, Abdolreza, Bloorchian, Azadeh Akhavan, Nassiri, Sina, and Marlow, Scott L.
- Subjects
RUNOFF analysis ,BEST management practices (Pollution prevention) ,SEDIMENT transport ,BIOSWALES ,WATER quality ,ROADS - Abstract
Best management practices (BMPs) are commonly used to reduce the adverse effects of post-construction runoff. BMP deterioration happens over time when these age and the infiltration rate decreases as a result of sediment accumulation. The objective of this paper was to investigate the effect of sediment accumulation on BMP stormwater runoff volume reduction performances. The BMPs studied included a bioswale and an infiltration trench. To undertake this research, both field tests and numerical simulations were conducted under five different and single rainfall events with a wide range of intensities and duration. The minimal sediment accumulation of 0.22 kg/m²·year was considered in this study. Three different sedimentation accumulation configurations (i.e., new, 2-year-old, and 10-year-old BMPs) were considered. According to the results, the infiltration trench had 100% runoff reduction efficiency in all conditions including high-intensity rain and 10-year-old BMP age. The performance of the bioswale for the first 2 and 10 years deteriorated by about 55% and 70%, respectively. [ABSTRACT FROM AUTHOR] more...
- Published
- 2017
- Full Text
- View/download PDF
49. Construction cost estimation: A parametric approach for better estimates of expected cost and variation.
- Author
-
Swei, Omar, Gregory, Jeremy, and Kirchain, Randolph
- Subjects
- *
BUSINESS losses , *WEIGHT-based pricing , *CONTINGENT fees , *FINANCIAL management , *COST accounting - Abstract
As project planners continue to move towards frameworks such as probabilistic life-cycle cost analysis to evaluate competing transportation investments, there is a need to enhance the current cost-estimation approaches that underlie these models to enable improved project selection. This paper presents an approach for cost estimation that combines a maximum likelihood estimator for data transformations with least angle regression for dimensionality reduction. The authors apply the proposed method for 15 different pavement bid items across five states in the United States. The results from the study demonstrate that the proposed approach frequently leads to consistent parametric estimates that address the structural bias and heteroscedasticity that plague the current cost-estimation procedures. Both of these aspects are particularly important for large-scale construction projects, where traditional methods tend to systematically underestimate expected construction costs and overestimate the associated variance. [ABSTRACT FROM AUTHOR] more...
- Published
- 2017
- Full Text
- View/download PDF
50. ULUSLARARASI TİCARET VE ULAŞILABİLİRLİK: TÜRKİYE KARAYOLLARI ÜZERİNE BİR ARAŞTIRMA.
- Author
-
ŞİMDİ, Halil, ŞEKER, Ayberk, and DANACI, Tuğçe
- Abstract
Transport costs are an important component of trade costs within the scope of international commercial activities. Transportation costs must be reduced for reduction of cost of trade and increase of trading volume. In this context, it is necessary to improve the transport infrastructure in order to reduce transportation costs. Improvement of transport infrastructure includes the development of road transport such as the development of the motorway network, enhancing the paved and divided road network. In this study, it was analyzed that the length of highways (divided highway, the asphalt road and motorway length) have the impact on international trade between 1984 and 2014 in Turkey. According to the result of analysis, ARDL Bound tests indicate that there is short term relationship between export-import and highways, divided ways and asphalt ways. Moreover, there are not causality relationship between the variables. [ABSTRACT FROM AUTHOR] more...
- Published
- 2017
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