The design of the geometry and traffic controls at signalised junctions is often focused on the level of service offered to motor vehicles and rarely considers the level of service offered to pedestrians. This results in pedestrian adopting illegal and unsafe behaviours – e.g. red light violation. This study aimed to identify the elements of signalised junction design that are critical in pedestrian safety by analysing how they affect pedestrian behaviour. Both traffic engineering design and associated traffic conditions were investigated. Over 6500 observations had been made at 10 signalised junctions in Montreal, Canada. The 10 junctions were selected to cover a variety of environments, road users and junction designs. Results show that the presence of a countdown display has the most significant and positive impact on pedestrian behaviour. Results also suggest that pedestrians cross on the red light when they feel confident about their ability to judge whether they can use the available traffic gaps to cross safely the street. This study concludes that an adequate junction design is likely to limit risky pedestrian behaviours. Therefore, designers need to consider the factors affecting the behaviour of pedestrians to design junctions that are safe convenient and safe for them.
{"title":"Exploration of the impact of junction characteristics on pedestrian red light violation","authors":"Luc Pellecuer, Aurélien Chusseau","doi":"10.1680/jinam.23.00023","DOIUrl":"https://doi.org/10.1680/jinam.23.00023","url":null,"abstract":"The design of the geometry and traffic controls at signalised junctions is often focused on the level of service offered to motor vehicles and rarely considers the level of service offered to pedestrians. This results in pedestrian adopting illegal and unsafe behaviours – e.g. red light violation. This study aimed to identify the elements of signalised junction design that are critical in pedestrian safety by analysing how they affect pedestrian behaviour. Both traffic engineering design and associated traffic conditions were investigated. Over 6500 observations had been made at 10 signalised junctions in Montreal, Canada. The 10 junctions were selected to cover a variety of environments, road users and junction designs. Results show that the presence of a countdown display has the most significant and positive impact on pedestrian behaviour. Results also suggest that pedestrians cross on the red light when they feel confident about their ability to judge whether they can use the available traffic gaps to cross safely the street. This study concludes that an adequate junction design is likely to limit risky pedestrian behaviours. Therefore, designers need to consider the factors affecting the behaviour of pedestrians to design junctions that are safe convenient and safe for them.","PeriodicalId":43387,"journal":{"name":"Infrastructure Asset Management","volume":"2 4","pages":""},"PeriodicalIF":0.7,"publicationDate":"2023-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138602923","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Jennifer McIntosh, K. Gharehbaghi, Kong Fah Tee, Angelo De Luca, Josh Scott Taylor
A comprehensive study is undertaken to investigate the most important factors influencing the increased demand for composite materials such as Fiber Reinforced Polymer (FRP), in civil infrastructure applications. Subsequently, the research aimed to develop a conceptual review, which ultimately examines the viability of composite materials for civil infrastructure applications. In doing so, a review of the literature was carried out to determine how composites differ from traditional materials. As such sustainable material practices were used as a framework. This research then assessed the viability of composite materials for Infrastructure and produced a viability rubric. This research has found that a) the biggest trends currently influencing composites use in infrastructures include, application-ability, constructability, design-ability, and performance-ability. Moreover, innovation, sustainability requirements, and economic constraints are also important considerations. Consequently, factors such as recyclability, cost, and maintenance are also important inclusions; b) although composites have a higher manufacturing cost, the overall life cycle cost which includes, installation, and use can be made more economical than traditional materials. Such findings can further promote the use of composite materials for civil Infrastructure applications.
{"title":"Viability rubric of FRP composites for civil infrastructure applications","authors":"Jennifer McIntosh, K. Gharehbaghi, Kong Fah Tee, Angelo De Luca, Josh Scott Taylor","doi":"10.1680/jinam.23.00009","DOIUrl":"https://doi.org/10.1680/jinam.23.00009","url":null,"abstract":"A comprehensive study is undertaken to investigate the most important factors influencing the increased demand for composite materials such as Fiber Reinforced Polymer (FRP), in civil infrastructure applications. Subsequently, the research aimed to develop a conceptual review, which ultimately examines the viability of composite materials for civil infrastructure applications. In doing so, a review of the literature was carried out to determine how composites differ from traditional materials. As such sustainable material practices were used as a framework. This research then assessed the viability of composite materials for Infrastructure and produced a viability rubric. This research has found that a) the biggest trends currently influencing composites use in infrastructures include, application-ability, constructability, design-ability, and performance-ability. Moreover, innovation, sustainability requirements, and economic constraints are also important considerations. Consequently, factors such as recyclability, cost, and maintenance are also important inclusions; b) although composites have a higher manufacturing cost, the overall life cycle cost which includes, installation, and use can be made more economical than traditional materials. Such findings can further promote the use of composite materials for civil Infrastructure applications.","PeriodicalId":43387,"journal":{"name":"Infrastructure Asset Management","volume":"15 19","pages":""},"PeriodicalIF":0.7,"publicationDate":"2023-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138603539","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Hamed Mehranfar, B. Adey, Saviz Moghtadernejad, Steven Chuo
Bridge managers need to generate a complete overview of required interventions, possession windows and the likely costs 10-20 years ahead of execution. These, even if approximate, help ensure stable train schedules. With the increasing amount of available data and the increasing desire to exploit digitalisation to improve decision-making, bridge managers are perfectly poised to make or improve these estimates by moving on from current qualitative methods. This paper proposes a way in the current climate to use digitalisation and existing data to generate approximate overviews of required interventions 10-20 years ahead of time, including estimates of component-level bridge interventions, possession windows, likely costs, and the increases in failure risks if interventions are postponed. A demonstration is done on 41 bridges of a 25 km railway network in Switzerland. It is argued that the algorithm generates a more complete and consistent overview of component-level interventions, possession windows, and costs compared to the current qualitative methods. Additionally, the algorithm generates a solid basis for the initiation of detailed investigations of the bridges by engineering offices, i.e., the investigations that result in the information required for scheduling an intervention, as well as estimating the type of intervention and track possession are required.
{"title":"Automated early estimation of bridge interventions, possession windows and costs","authors":"Hamed Mehranfar, B. Adey, Saviz Moghtadernejad, Steven Chuo","doi":"10.1680/jinam.23.00038","DOIUrl":"https://doi.org/10.1680/jinam.23.00038","url":null,"abstract":"Bridge managers need to generate a complete overview of required interventions, possession windows and the likely costs 10-20 years ahead of execution. These, even if approximate, help ensure stable train schedules. With the increasing amount of available data and the increasing desire to exploit digitalisation to improve decision-making, bridge managers are perfectly poised to make or improve these estimates by moving on from current qualitative methods. This paper proposes a way in the current climate to use digitalisation and existing data to generate approximate overviews of required interventions 10-20 years ahead of time, including estimates of component-level bridge interventions, possession windows, likely costs, and the increases in failure risks if interventions are postponed. A demonstration is done on 41 bridges of a 25 km railway network in Switzerland. It is argued that the algorithm generates a more complete and consistent overview of component-level interventions, possession windows, and costs compared to the current qualitative methods. Additionally, the algorithm generates a solid basis for the initiation of detailed investigations of the bridges by engineering offices, i.e., the investigations that result in the information required for scheduling an intervention, as well as estimating the type of intervention and track possession are required.","PeriodicalId":43387,"journal":{"name":"Infrastructure Asset Management","volume":"51 4","pages":""},"PeriodicalIF":0.7,"publicationDate":"2023-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139256622","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The construction industry itself has led to a large amount of energy consumption, and this paper is based on genetic algorithm to optimize the planning and design of rural buildings with energy saving and multi-objective. Firstly, the multi-objective optimization problem and Pareto concept are discussed, the NSGA-II algorithm is applied to solve the problem of building energy saving integrated optimization, and the algorithm implementation of building energy saving integrated optimization design based on NSGA-II algorithm is given. Use incremental costs and incremental benefits as objective functions and make relevant assumptions to keep the model realistic while simplifying calculations. Second, a series of constraint functions are set up to ensure the superiority of the results. By constructing model assumptions, objective functions and constraint functions, the energy-saving optimization model is formed and solved by genetic algorithm. From the optimization results, it can be seen that the energy consumption of all the design schemes in the Pareto solution set is between 25.0 KWh/m2∼31.7 KWh/m2. Therefore, in the selection of architectural planning and design schemes, we should avoid simply pursuing low energy consumption and high comfort, and also use comprehensive consideration of economic costs to choose the most cost-effective scheme.
{"title":"Multi-objective optimization of building planning energy saving based on genetic algorithm","authors":"Ningjing Chen, Juanfen Wang","doi":"10.1680/jinam.23.00040","DOIUrl":"https://doi.org/10.1680/jinam.23.00040","url":null,"abstract":"The construction industry itself has led to a large amount of energy consumption, and this paper is based on genetic algorithm to optimize the planning and design of rural buildings with energy saving and multi-objective. Firstly, the multi-objective optimization problem and Pareto concept are discussed, the NSGA-II algorithm is applied to solve the problem of building energy saving integrated optimization, and the algorithm implementation of building energy saving integrated optimization design based on NSGA-II algorithm is given. Use incremental costs and incremental benefits as objective functions and make relevant assumptions to keep the model realistic while simplifying calculations. Second, a series of constraint functions are set up to ensure the superiority of the results. By constructing model assumptions, objective functions and constraint functions, the energy-saving optimization model is formed and solved by genetic algorithm. From the optimization results, it can be seen that the energy consumption of all the design schemes in the Pareto solution set is between 25.0 KWh/m2∼31.7 KWh/m2. Therefore, in the selection of architectural planning and design schemes, we should avoid simply pursuing low energy consumption and high comfort, and also use comprehensive consideration of economic costs to choose the most cost-effective scheme.","PeriodicalId":43387,"journal":{"name":"Infrastructure Asset Management","volume":" 2","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135241475","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Claudio Martani, Noemi Fiorot, Andrea González, Bryan T Adey, Joris Van Wezemael
The potential growth in home-office working poses a large uncertainty on the future demand for office space. Flexible offices can help limit the negative effect of this uncertainty by allowing future changes of use. To ensure that the investment in flexibility is proportioned to the risk it minimizes, the real options methodology is used in this work for modelling the uncertainty of future demand for office space and estimating its effect on stakeholders in the long-term. The methodology is tested on an example multi-story mixed-tenants office building in Zurich for which ten designs are proposed and the triggering logic modelled. The designs have various degrees of flexibility and the triggering logic mimic the decision criteria of an owner. The results show that, under the investigated circumstances, a flexible design with movable walls to enable a periodic conversion of the unrented office space into co-working spaces, and with parceled technical elements to allow the conversion of long unrented office space into residential units, is the optimal decision for all involved stakeholders over the building’s life. The authors draw conclusions about strengths and limitations of the real options methodology in this context and envision future developments.
{"title":"Evaluating the impact of flexible offices in coping with the uncertainty on future demand","authors":"Claudio Martani, Noemi Fiorot, Andrea González, Bryan T Adey, Joris Van Wezemael","doi":"10.1680/jinam.23.00027","DOIUrl":"https://doi.org/10.1680/jinam.23.00027","url":null,"abstract":"The potential growth in home-office working poses a large uncertainty on the future demand for office space. Flexible offices can help limit the negative effect of this uncertainty by allowing future changes of use. To ensure that the investment in flexibility is proportioned to the risk it minimizes, the real options methodology is used in this work for modelling the uncertainty of future demand for office space and estimating its effect on stakeholders in the long-term. The methodology is tested on an example multi-story mixed-tenants office building in Zurich for which ten designs are proposed and the triggering logic modelled. The designs have various degrees of flexibility and the triggering logic mimic the decision criteria of an owner. The results show that, under the investigated circumstances, a flexible design with movable walls to enable a periodic conversion of the unrented office space into co-working spaces, and with parceled technical elements to allow the conversion of long unrented office space into residential units, is the optimal decision for all involved stakeholders over the building’s life. The authors draw conclusions about strengths and limitations of the real options methodology in this context and envision future developments.","PeriodicalId":43387,"journal":{"name":"Infrastructure Asset Management","volume":"3 ","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135870653","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Colin A Booth, Sona Rasheed, Abdul-Majeed Mahamadu, Rosemary Horry, Samuel Abbey, Patrick Manu, K A B Awuah, Emmanuel Aboagye-Nimo, Panagiotis Georgakis, Abhi Prabhakaran
Earthships remain a relatively under explored type of sustainable/alternative home. This is the first study to investigate the personal experiences of constructing and living in European Earthship–homes. The aim of this study is to reveal insights into the ‘hands–on’ practical experience of persons who have constructed their own Earthship–homes; and to also gather insights into the collective experience of these dwellers on the realities of living full–time in an Earthship–home. A phenomenological methodology, using an inductive research approach, was utilised through a qualitative research strategy to solicit insights into the personal experiences of these unique persons. The main themes and sub–themes that emerge from analysis are that anyone from any background can make the shift to building/living in an Earthship–home. However, a mixed skillset and knowledge of building trades, plus a physical and emotional prowess is needed for the long–haul build process, together with access to financial means and/or available materials are critical factors that influence the outcome of the Earthship building. Meanwhile, once constructed, off–grid living in an Earthship–home gives dwellers a greater connectivity with the natural world, raises awareness of consumerism and an enhanced appreciation of human impacts.
{"title":"A phenomenological inquiry of building and living in European Earthship homes","authors":"Colin A Booth, Sona Rasheed, Abdul-Majeed Mahamadu, Rosemary Horry, Samuel Abbey, Patrick Manu, K A B Awuah, Emmanuel Aboagye-Nimo, Panagiotis Georgakis, Abhi Prabhakaran","doi":"10.1680/jinam.23.00028","DOIUrl":"https://doi.org/10.1680/jinam.23.00028","url":null,"abstract":"Earthships remain a relatively under explored type of sustainable/alternative home. This is the first study to investigate the personal experiences of constructing and living in European Earthship–homes. The aim of this study is to reveal insights into the ‘hands–on’ practical experience of persons who have constructed their own Earthship–homes; and to also gather insights into the collective experience of these dwellers on the realities of living full–time in an Earthship–home. A phenomenological methodology, using an inductive research approach, was utilised through a qualitative research strategy to solicit insights into the personal experiences of these unique persons. The main themes and sub–themes that emerge from analysis are that anyone from any background can make the shift to building/living in an Earthship–home. However, a mixed skillset and knowledge of building trades, plus a physical and emotional prowess is needed for the long–haul build process, together with access to financial means and/or available materials are critical factors that influence the outcome of the Earthship building. Meanwhile, once constructed, off–grid living in an Earthship–home gives dwellers a greater connectivity with the natural world, raises awareness of consumerism and an enhanced appreciation of human impacts.","PeriodicalId":43387,"journal":{"name":"Infrastructure Asset Management","volume":"14 3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135883369","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
S M Charlesworth, D Kligerman, F Warwick, M Blackett
The 2015 Zika virus outbreak in Brazil established that neonate microcephaly was related to maternal infection by the virus during pregnancy, the highest densities of which occurred in the northeast and southeast of Brazil, the country’s most populated areas. These areas are typically associated with informal settlements or favelas which lack effective water management, sanitation and drainage, hence providing suitable breeding environments for the Aedes aegypti mosquito, the Zika virus vector. This paper reports on a novel study of community perceptions around the potential for Sustainable Drainage Systems to provide a means of reducing areas for the mosquito to breed, and hence reduce Zika infections in favelas. Interviews were carried out with key external stakeholders working with favelas and members of the favela community. Poor management of water supply, drainage and solid waste were clearly emphasised by participants illustrating gaps in current research connecting these areas. Participants proposed that only a holistic approach could address sanitation issues, hence the distribution of Zika-carrying mosquitos, subsequent infections and microcephaly. An approach was therefore needed taking account of the environment as a whole, increasing public awareness of sanitation and environmental health, improving sanitation infrastructure and providing adequate systems for solid waste management.
{"title":"Sustainable drainage to address Zika and lack of drainage in favelas, Brazil: community perspectives","authors":"S M Charlesworth, D Kligerman, F Warwick, M Blackett","doi":"10.1680/jinam.23.00012","DOIUrl":"https://doi.org/10.1680/jinam.23.00012","url":null,"abstract":"The 2015 Zika virus outbreak in Brazil established that neonate microcephaly was related to maternal infection by the virus during pregnancy, the highest densities of which occurred in the northeast and southeast of Brazil, the country’s most populated areas. These areas are typically associated with informal settlements or favelas which lack effective water management, sanitation and drainage, hence providing suitable breeding environments for the Aedes aegypti mosquito, the Zika virus vector. This paper reports on a novel study of community perceptions around the potential for Sustainable Drainage Systems to provide a means of reducing areas for the mosquito to breed, and hence reduce Zika infections in favelas. Interviews were carried out with key external stakeholders working with favelas and members of the favela community. Poor management of water supply, drainage and solid waste were clearly emphasised by participants illustrating gaps in current research connecting these areas. Participants proposed that only a holistic approach could address sanitation issues, hence the distribution of Zika-carrying mosquitos, subsequent infections and microcephaly. An approach was therefore needed taking account of the environment as a whole, increasing public awareness of sanitation and environmental health, improving sanitation infrastructure and providing adequate systems for solid waste management.","PeriodicalId":43387,"journal":{"name":"Infrastructure Asset Management","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135385925","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
It is important to consider the impact of nonuniform excitations on long structures including bridges. This study investigates how the dynamic behavior of a cable-stayed bridge is impacted by multiple sources of support excitation. The bridge is simulated by applying the ABAQUS software. The results show that different parameters such as stresses in cables, base shear of towers and supports, and when multiple sources of support excitation affect a bridge, the displacements undergo significant changes. For instance, in nonuniform excitation mode, the two end supports display an average enhancement of approximately 25%, in contrast, the towers exhibit an average increase of 23% in comparison with the uniform excitation mode. Moreover, an examination is conducted into the effectiveness of various health-monitoring techniques, such as mode-shape curvature (MSC) and energy index (EI) to find the damages on the bridge, as bridges are important infrastructures and monitoring them during their operation could save lives and costs. In this regard, Matlab software is used and the stiffnesses of some parts of the deck are decreased as intentional damages. After comparing the methods mentioned, the research indicated that using the EI rest on strain responses is a highly effective means of detecting damage.
{"title":"Health monitoring methods on long-span cable-stayed bridges","authors":"Arezoo Bakhshizadeh, K. Sadeghi","doi":"10.1680/jinam.23.00030","DOIUrl":"https://doi.org/10.1680/jinam.23.00030","url":null,"abstract":"It is important to consider the impact of nonuniform excitations on long structures including bridges. This study investigates how the dynamic behavior of a cable-stayed bridge is impacted by multiple sources of support excitation. The bridge is simulated by applying the ABAQUS software. The results show that different parameters such as stresses in cables, base shear of towers and supports, and when multiple sources of support excitation affect a bridge, the displacements undergo significant changes. For instance, in nonuniform excitation mode, the two end supports display an average enhancement of approximately 25%, in contrast, the towers exhibit an average increase of 23% in comparison with the uniform excitation mode. Moreover, an examination is conducted into the effectiveness of various health-monitoring techniques, such as mode-shape curvature (MSC) and energy index (EI) to find the damages on the bridge, as bridges are important infrastructures and monitoring them during their operation could save lives and costs. In this regard, Matlab software is used and the stiffnesses of some parts of the deck are decreased as intentional damages. After comparing the methods mentioned, the research indicated that using the EI rest on strain responses is a highly effective means of detecting damage.","PeriodicalId":43387,"journal":{"name":"Infrastructure Asset Management","volume":"39 1","pages":""},"PeriodicalIF":0.7,"publicationDate":"2023-08-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73159579","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Moisture in hot mix asphalt (HMA) can cause serious damage like cracks and ruts if left untreated. This is due to the separation of binder and aggregates caused by moisture-induced stripping. Existing approaches for assessing moisture damage in asphalt are time-consuming, destructive, and expensive to implement. In contrast, digital image analysis provides a simple, inexpensive, and non-destructive method to identify moisture-sensitive mixes. Color, as an essential characteristic of an image, effectively conveys information about its content. This study seeks to explore the potential of analyzing digital image color in the L a* b* color space to assess the moisture sensitivity of HMA after Moisture Induced Stress Tester (MIST) conditioning. Laboratory compacted specimens of loose asphalt mixtures from the field were studied by image processing followed by statistical test of significance. It is found that the two parameters, namely, ‘average color value for L channel’ and ‘standard deviation value for b* channel’, can be used to distinguish between moisture-sensitive and non-sensitive mixes. The findings of this study suggest that future research may find color to be a helpful criterion for characterizing asphalt materials using digital image processing
{"title":"Digital image color analysis to evaluate moisture sensitivity of hot mix asphalt (HMA) mixes","authors":"Prachi Joshi, R. Mallick","doi":"10.1680/jinam.22.00041","DOIUrl":"https://doi.org/10.1680/jinam.22.00041","url":null,"abstract":"Moisture in hot mix asphalt (HMA) can cause serious damage like cracks and ruts if left untreated. This is due to the separation of binder and aggregates caused by moisture-induced stripping. Existing approaches for assessing moisture damage in asphalt are time-consuming, destructive, and expensive to implement. In contrast, digital image analysis provides a simple, inexpensive, and non-destructive method to identify moisture-sensitive mixes. Color, as an essential characteristic of an image, effectively conveys information about its content. This study seeks to explore the potential of analyzing digital image color in the L a* b* color space to assess the moisture sensitivity of HMA after Moisture Induced Stress Tester (MIST) conditioning. Laboratory compacted specimens of loose asphalt mixtures from the field were studied by image processing followed by statistical test of significance. It is found that the two parameters, namely, ‘average color value for L channel’ and ‘standard deviation value for b* channel’, can be used to distinguish between moisture-sensitive and non-sensitive mixes. The findings of this study suggest that future research may find color to be a helpful criterion for characterizing asphalt materials using digital image processing","PeriodicalId":43387,"journal":{"name":"Infrastructure Asset Management","volume":"47 1","pages":""},"PeriodicalIF":0.7,"publicationDate":"2023-07-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90502839","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Asset management is one of the emerging disciplines in worldwide since most of the organizations are facing challenges in sustaining their operations with the aging of assets. On the other hand, managing of assets and the cost of maintenance have made real-time challenges for them. Hence, the objective of this study is to develop a framework for predictive maintenance of assets considering the existing assessment frameworks of the early researchers. However, the significance of this research is that the framework is developed focusing the passenger terminals where this concept has been narrowly addressed. Kandy Multimodal Transit Terminal was selected for the case study. Accordingly, Markov Chain was used for developing the framework. A conceptual framework was introduced for the predictive maintenance of assets and the cost projections considering the availability of data. Hence, the outcome of this research facilitates to reduce the consequences in asset maintenance management, and to manage the budget allocation for the maintenance in the passenger terminals.
{"title":"Assessment framework for asset maintenance in passenger terminals","authors":"Shanika Kanchani Manamperi, A.A.D.A.J. Perera","doi":"10.1680/jinam.23.00003","DOIUrl":"https://doi.org/10.1680/jinam.23.00003","url":null,"abstract":"Asset management is one of the emerging disciplines in worldwide since most of the organizations are facing challenges in sustaining their operations with the aging of assets. On the other hand, managing of assets and the cost of maintenance have made real-time challenges for them. Hence, the objective of this study is to develop a framework for predictive maintenance of assets considering the existing assessment frameworks of the early researchers. However, the significance of this research is that the framework is developed focusing the passenger terminals where this concept has been narrowly addressed. Kandy Multimodal Transit Terminal was selected for the case study. Accordingly, Markov Chain was used for developing the framework. A conceptual framework was introduced for the predictive maintenance of assets and the cost projections considering the availability of data. Hence, the outcome of this research facilitates to reduce the consequences in asset maintenance management, and to manage the budget allocation for the maintenance in the passenger terminals.","PeriodicalId":43387,"journal":{"name":"Infrastructure Asset Management","volume":"80 1","pages":""},"PeriodicalIF":0.7,"publicationDate":"2023-07-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87096812","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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