Sustainable engineering design requires the joint consideration of technical, ecological, economic and social aspects in the provision of societal demands, such as water and energy supply. A growing number of concepts and methods for integrated assessment and sustainable design have been developed in recent decades, and pose new challenges to the engineering profession. This article proposes the use of systems design concepts and methods to link engineering design to ecological and social-economic knowledge. This study expands the conventional functional analysis approach from systems engineering with a technical focus toward a more integrated perspective that allows for the joint consideration of technical, ecological and social-economic solutions in engineering design. Participatory systems thinking and system dynamics modelling are used for conceptual and preliminary system design by analysing the hierarchy and flows of functions to meet system requirements. The methodology consists of three steps: requirements analysis (Step 1), functional organisation analysis (Step 2) and functional flow analysis (Step 3). An application of the methodology is provided using sustainable water management in Cyprus as an example. The results demonstrate the synergies and trade-offs between technical, ecological and social solutions in water management that provide important information for the subsequent detailed system design phase.
{"title":"Bridging technical, ecological and social-economic knowledge in engineering design","authors":"J. Halbe, J. Adamowski","doi":"10.1680/jensu.21.00063","DOIUrl":"https://doi.org/10.1680/jensu.21.00063","url":null,"abstract":"Sustainable engineering design requires the joint consideration of technical, ecological, economic and social aspects in the provision of societal demands, such as water and energy supply. A growing number of concepts and methods for integrated assessment and sustainable design have been developed in recent decades, and pose new challenges to the engineering profession. This article proposes the use of systems design concepts and methods to link engineering design to ecological and social-economic knowledge. This study expands the conventional functional analysis approach from systems engineering with a technical focus toward a more integrated perspective that allows for the joint consideration of technical, ecological and social-economic solutions in engineering design. Participatory systems thinking and system dynamics modelling are used for conceptual and preliminary system design by analysing the hierarchy and flows of functions to meet system requirements. The methodology consists of three steps: requirements analysis (Step 1), functional organisation analysis (Step 2) and functional flow analysis (Step 3). An application of the methodology is provided using sustainable water management in Cyprus as an example. The results demonstrate the synergies and trade-offs between technical, ecological and social solutions in water management that provide important information for the subsequent detailed system design phase.","PeriodicalId":49671,"journal":{"name":"Proceedings of the Institution of Civil Engineers-Engineering Sustainability","volume":"121 1","pages":""},"PeriodicalIF":1.2,"publicationDate":"2022-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77261058","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Coal-fired thermal power plant ash (CTPA) has been widely used in construction works not only as a partial replacement to conventional cementitious binders but also as a substitute to fine aggregates. However, higher volumes of CTPA in concrete typically lead to non-satisfactory performance of concrete in terms of strength and durability. This was remedied by incorporation of hyper-plasticizers which offset the negative effects of loss of workability, segregation, bleeding, and strength reduction. This study describes three field studies undertaken with ultra-high volumes of CTPA in terms of Class-F fly ash (FA) and coarse bottom ash (BA) in M40 grade sustainable pavement quality concrete (PQC) at NTPC Khargone, Khargone, India, NTPC Mouda, Nagpur, India, and DIL Tadali, Chandrapur, India. Core samples of 100mm diameter and varying slenderness ratio were drawn from casted segments at site after 28 days curing and the results in terms of compressive strength and durability characteristics were evaluated against the results of laboratory investigation. Statistical analysis was also conducted using student’s t-test to analysis the variance in the results. Effects of H/D ratio of core samples on the compressive strength of cores were also analyzed. The results indicate a non-significant difference in the values of means of compressive strength of the batches for H/D = 1 indicating the field applicability of the developed mix designs for severe exposure conditions.
{"title":"Field investigation of sustainable green concrete incorporating ultra-high volumes of coal ash – a case study","authors":"A. Titiksh, S. Wanjari","doi":"10.1680/jensu.22.00047","DOIUrl":"https://doi.org/10.1680/jensu.22.00047","url":null,"abstract":"Coal-fired thermal power plant ash (CTPA) has been widely used in construction works not only as a partial replacement to conventional cementitious binders but also as a substitute to fine aggregates. However, higher volumes of CTPA in concrete typically lead to non-satisfactory performance of concrete in terms of strength and durability. This was remedied by incorporation of hyper-plasticizers which offset the negative effects of loss of workability, segregation, bleeding, and strength reduction. This study describes three field studies undertaken with ultra-high volumes of CTPA in terms of Class-F fly ash (FA) and coarse bottom ash (BA) in M40 grade sustainable pavement quality concrete (PQC) at NTPC Khargone, Khargone, India, NTPC Mouda, Nagpur, India, and DIL Tadali, Chandrapur, India. Core samples of 100mm diameter and varying slenderness ratio were drawn from casted segments at site after 28 days curing and the results in terms of compressive strength and durability characteristics were evaluated against the results of laboratory investigation. Statistical analysis was also conducted using student’s t-test to analysis the variance in the results. Effects of H/D ratio of core samples on the compressive strength of cores were also analyzed. The results indicate a non-significant difference in the values of means of compressive strength of the batches for H/D = 1 indicating the field applicability of the developed mix designs for severe exposure conditions.","PeriodicalId":49671,"journal":{"name":"Proceedings of the Institution of Civil Engineers-Engineering Sustainability","volume":"51 1","pages":""},"PeriodicalIF":1.2,"publicationDate":"2022-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76629679","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
As a result of urban transformation activities, natural disasters (earthquakes, tsunamis, storms, floods, hurricanes, tornadoes, volcanic eruptions, firestorms, dust storms), regional and global wars, billions of tons of waste concrete occur. Therefore, the remediation process of waste concrete is one of the critical research topics of recent years. The sustainability concept provides a primary bridge between the demand for natural concrete material and the remediation process of waste concrete. Recycled aggregate and recycled concrete aggregate, which may be named sustainable materials, are obtained by the recycling process of waste concrete. Many experimental and numerical studies have been conducted to exhibit that this sustainable material is an alternative product to natural aggregate in recent years. According to the authors’ best knowledge, the originality of this study: (a) this is the first time that comprehensive numerical simulation results of soil-structure interaction containing sustainable concrete and filling materials are reported in detail, (b) investigation of the applicability of existing numerical simulation models in sustainable soil-structure interaction problems, (c) contribution the realistic simulation of the structural behavior of the sustainable soil-structure interactions. In this study, which contributed to the studies in the literature, a comprehensive numerical simulation of foundation beams resting on soils incorporated with conventional and sustainable material has been performed. The concrete properties of these foundation beams are considered with conventional (natural aggregate) concrete and sustainable (recycled aggregate) concrete with four different recycled concrete aggregate ratios (25%, 50%, 75%, and 100%). In addition, the material conditions of soils are regarded with six different mixed recycled aggregates as a filling material. Based on the numerical simulation, the deflection, rotation, bending moment, shear force, and spring force capacities of conventional and sustainable foundation beams resting on soils exhibited slightly different behavior depending on the recycled concrete aggregate and mixed recycled aggregate ratios. Finally, comparing the numerical simulation results of soil-structural interaction members incorporating conventional and sustainable materials indicated that the soil-structure interaction modeling process applied to conventional foundation beams resting on soils is also valid for sustainable members.
{"title":"A novel numerical simulation of the soil-structure interaction incorporating sustainable concrete and filling materials","authors":"I. Saribas, Bahadir Ok","doi":"10.1680/jensu.22.00062","DOIUrl":"https://doi.org/10.1680/jensu.22.00062","url":null,"abstract":"As a result of urban transformation activities, natural disasters (earthquakes, tsunamis, storms, floods, hurricanes, tornadoes, volcanic eruptions, firestorms, dust storms), regional and global wars, billions of tons of waste concrete occur. Therefore, the remediation process of waste concrete is one of the critical research topics of recent years. The sustainability concept provides a primary bridge between the demand for natural concrete material and the remediation process of waste concrete. Recycled aggregate and recycled concrete aggregate, which may be named sustainable materials, are obtained by the recycling process of waste concrete. Many experimental and numerical studies have been conducted to exhibit that this sustainable material is an alternative product to natural aggregate in recent years. According to the authors’ best knowledge, the originality of this study: (a) this is the first time that comprehensive numerical simulation results of soil-structure interaction containing sustainable concrete and filling materials are reported in detail, (b) investigation of the applicability of existing numerical simulation models in sustainable soil-structure interaction problems, (c) contribution the realistic simulation of the structural behavior of the sustainable soil-structure interactions. In this study, which contributed to the studies in the literature, a comprehensive numerical simulation of foundation beams resting on soils incorporated with conventional and sustainable material has been performed. The concrete properties of these foundation beams are considered with conventional (natural aggregate) concrete and sustainable (recycled aggregate) concrete with four different recycled concrete aggregate ratios (25%, 50%, 75%, and 100%). In addition, the material conditions of soils are regarded with six different mixed recycled aggregates as a filling material. Based on the numerical simulation, the deflection, rotation, bending moment, shear force, and spring force capacities of conventional and sustainable foundation beams resting on soils exhibited slightly different behavior depending on the recycled concrete aggregate and mixed recycled aggregate ratios. Finally, comparing the numerical simulation results of soil-structural interaction members incorporating conventional and sustainable materials indicated that the soil-structure interaction modeling process applied to conventional foundation beams resting on soils is also valid for sustainable members.","PeriodicalId":49671,"journal":{"name":"Proceedings of the Institution of Civil Engineers-Engineering Sustainability","volume":"45 1","pages":""},"PeriodicalIF":1.2,"publicationDate":"2022-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74497898","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
This study presents utilisation of High-Volume Fly Ash (HVFA) in design of Self-Compacting Concrete (SCC) containing alternative aggregate particles. The class-F Fly Ash was used in a binary blend of Portland Cement at a fixed dosage of 50% by weight of powder and natural coarse and fine aggregates were replaced with coarse and fine Recycled Concrete Aggregates (RCAs), respectively, at replacement levels of 0%, 50% and 100% by volume. Durability properties of the SCC mixes were studied using rapid chloride penetration test, initial surface absorption test and capillary suction test. Results of the study showed that concrete mix made with replacement of natural coarse aggregates with 50% coarse RCAs, concrete mix made replacement of natural fine aggregates with 50% fine RCAs and concrete mix made with replacement of both natural coarse and fine aggregates with the respective RCAs at 50% replacement level exhibits satisfactory performance without compromising their fresh and hardened state properties. Furthermore, the incorporation of HVFA in SCCs improved the hardened state properties at later ages of curing due to the secondary pozzolanic reaction.
{"title":"Durability behaviour of self-compacting concrete containing high-volume fly ash and alternative aggregates","authors":"K. Kumar, K. Kapoor, R. Singh, Paramveer Singh","doi":"10.1680/jensu.22.00059","DOIUrl":"https://doi.org/10.1680/jensu.22.00059","url":null,"abstract":"This study presents utilisation of High-Volume Fly Ash (HVFA) in design of Self-Compacting Concrete (SCC) containing alternative aggregate particles. The class-F Fly Ash was used in a binary blend of Portland Cement at a fixed dosage of 50% by weight of powder and natural coarse and fine aggregates were replaced with coarse and fine Recycled Concrete Aggregates (RCAs), respectively, at replacement levels of 0%, 50% and 100% by volume. Durability properties of the SCC mixes were studied using rapid chloride penetration test, initial surface absorption test and capillary suction test. Results of the study showed that concrete mix made with replacement of natural coarse aggregates with 50% coarse RCAs, concrete mix made replacement of natural fine aggregates with 50% fine RCAs and concrete mix made with replacement of both natural coarse and fine aggregates with the respective RCAs at 50% replacement level exhibits satisfactory performance without compromising their fresh and hardened state properties. Furthermore, the incorporation of HVFA in SCCs improved the hardened state properties at later ages of curing due to the secondary pozzolanic reaction.","PeriodicalId":49671,"journal":{"name":"Proceedings of the Institution of Civil Engineers-Engineering Sustainability","volume":"52 1","pages":""},"PeriodicalIF":1.2,"publicationDate":"2022-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90501266","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Road infrastructure is necessary for any country to function and upon which daily life depends. Novel sources of vulnerability, such as climate change or increased interdependencies amongst networks due to technological advancements, can lead to road disruptions. Those disruptions may have catastrophic results if there are no alternative routes to serve traffic. State of the art research in improving transport network connectivity and consequently resilience focuses on adopting a network perspective. However, there is no comprehensive, widespread method for evaluating connectivity and proposing alternative routes to enhance it. Presented herein is a framework that firstly assesses road network connectivity using a “closeness” measure and secondly proposes the development of optimal alternative routes, using a genetic algorithm. The case study examines routes passing by the vulnerable asset of bridges. The results showed a significant improvement of network connectivity and the potential of the method to serve as the basis for updated transport infrastructure planning practices.
{"title":"Briefing: Rethinking urban infrastructure from an ecological perspective in a post Covid-19 world","authors":"Ian Mell","doi":"10.1680/jensu.22.09999","DOIUrl":"https://doi.org/10.1680/jensu.22.09999","url":null,"abstract":"Road infrastructure is necessary for any country to function and upon which daily life depends. Novel sources of vulnerability, such as climate change or increased interdependencies amongst networks due to technological advancements, can lead to road disruptions. Those disruptions may have catastrophic results if there are no alternative routes to serve traffic. State of the art research in improving transport network connectivity and consequently resilience focuses on adopting a network perspective. However, there is no comprehensive, widespread method for evaluating connectivity and proposing alternative routes to enhance it. Presented herein is a framework that firstly assesses road network connectivity using a “closeness” measure and secondly proposes the development of optimal alternative routes, using a genetic algorithm. The case study examines routes passing by the vulnerable asset of bridges. The results showed a significant improvement of network connectivity and the potential of the method to serve as the basis for updated transport infrastructure planning practices.","PeriodicalId":49671,"journal":{"name":"Proceedings of the Institution of Civil Engineers-Engineering Sustainability","volume":"66 1","pages":""},"PeriodicalIF":1.2,"publicationDate":"2022-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77732561","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Battery electric buses (BEBs) are introduced to substitute for diesel buses worldwide owing to their zero emissions. Investigating BEB scheduling problems is crucial for minimizing charging costs and satisfying passenger demands. In addition, photovoltaic and energy storage system (PESS) adoption on public transport could offer a promising alternative toward reducing charging cost and carbon emissions. This paper presents a novel BEB scheduling problem in which PESS is deployed at bus charging stations. The proposed problem is formulated as a mixed-integer linear programming in which BEB scheduling and photovoltaic (PV) energy scheduling are optimized. To improve solution efficiency, a two-step solution approach is proposed. First, a BEB scheduling problem without considering PESS is solved in the first step, and then a PV energy scheduling problem is solved in the second step. A case study is performed using the operational data of bus No. 404 and 109 in Beijing. Results show that the sum of charging and carbon emission costs will be reduced considerably if PESS is introduced in a transit system. This study provides new insights for engineering a sustainable future in green transportation.
{"title":"Optimal electric bus scheduling by considering photovoltaic charging infrastructure","authors":"Xiaohan Liu, Xiaolei Ma, Ruifeng Shi, Zhengke Liu","doi":"10.1680/jensu.22.00061","DOIUrl":"https://doi.org/10.1680/jensu.22.00061","url":null,"abstract":"Battery electric buses (BEBs) are introduced to substitute for diesel buses worldwide owing to their zero emissions. Investigating BEB scheduling problems is crucial for minimizing charging costs and satisfying passenger demands. In addition, photovoltaic and energy storage system (PESS) adoption on public transport could offer a promising alternative toward reducing charging cost and carbon emissions. This paper presents a novel BEB scheduling problem in which PESS is deployed at bus charging stations. The proposed problem is formulated as a mixed-integer linear programming in which BEB scheduling and photovoltaic (PV) energy scheduling are optimized. To improve solution efficiency, a two-step solution approach is proposed. First, a BEB scheduling problem without considering PESS is solved in the first step, and then a PV energy scheduling problem is solved in the second step. A case study is performed using the operational data of bus No. 404 and 109 in Beijing. Results show that the sum of charging and carbon emission costs will be reduced considerably if PESS is introduced in a transit system. This study provides new insights for engineering a sustainable future in green transportation.","PeriodicalId":49671,"journal":{"name":"Proceedings of the Institution of Civil Engineers-Engineering Sustainability","volume":"113 1","pages":""},"PeriodicalIF":1.2,"publicationDate":"2022-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81112928","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The relevance, relative importance and co-linearity of input parameters to the results of building energy demand forecasts were investigated. Two calendar years of historical data including weather variables and days of week were used. The study also aimed to assess the performance of multiple-linear-regression, support-vector-machine and artificial-neural-network models for predicting daily heating, ventilation and air-conditioning energy consumption of a commercial building in France. Mean absolute error, root mean square error and coefficient of variation of root-mean squared error were selected as the performance criteria. The results showed that the best performance was achieved via the artificial-neural-network model according to all performance measures. In addition, the other two models were not able to meet the predicting requirements for energy consumption in a building since their coefficient-of-variation-o-root-mean-squared error values were not below 30%. The results also indicated that there was multiple co-linearity between the number of degree days and outdoor temperature. Furthermore, the most significant parameter on daily energy consumption was found to be the number of degree days, followed by global radiation, sunshine rate and the day of the week, respectively.
{"title":"Benchmarking performance of machine-learning methods for building energy demand modelling","authors":"Merve Kuru Erdem, Onur Sariçiçek, G. Calis","doi":"10.1680/jensu.21.00101","DOIUrl":"https://doi.org/10.1680/jensu.21.00101","url":null,"abstract":"The relevance, relative importance and co-linearity of input parameters to the results of building energy demand forecasts were investigated. Two calendar years of historical data including weather variables and days of week were used. The study also aimed to assess the performance of multiple-linear-regression, support-vector-machine and artificial-neural-network models for predicting daily heating, ventilation and air-conditioning energy consumption of a commercial building in France. Mean absolute error, root mean square error and coefficient of variation of root-mean squared error were selected as the performance criteria. The results showed that the best performance was achieved via the artificial-neural-network model according to all performance measures. In addition, the other two models were not able to meet the predicting requirements for energy consumption in a building since their coefficient-of-variation-o-root-mean-squared error values were not below 30%. The results also indicated that there was multiple co-linearity between the number of degree days and outdoor temperature. Furthermore, the most significant parameter on daily energy consumption was found to be the number of degree days, followed by global radiation, sunshine rate and the day of the week, respectively.","PeriodicalId":49671,"journal":{"name":"Proceedings of the Institution of Civil Engineers-Engineering Sustainability","volume":"16 1","pages":""},"PeriodicalIF":1.2,"publicationDate":"2022-08-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88850732","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
R. Ashley, B. Horton, L. Walker, C. Digman, P. Shaffer, S. Herk
Multi-functional nature-based solutions (NBS) can help urban areas become more climate proof, adaptable, and provide a range of societal goals. Alongside chronic impacts from climate change, the Covid-19 pandemic has illustrated the disruption that unexpected and acute shocks can bring to society. Measures like NBS can help reduce the vulnerability of urban areas and increase resilience. Traditional infrastructure planning relies on strong business cases to demonstrate the economic value of a scheme. Numerous approaches assign economic value to the benefits from using NBS. However, this value is more than can be accounted by traditional finance methods as there are many different perspectives on ‘value’. Decision making processes for selection of NBS measures require stronger integration of these value perspectives. This paper considers these perspectives in the business models that are being used in the decision processes regarding use and selection of NBS. Examples are drawn from case studies in the EU BEGIN project and also from the Living With Water (LWW) partnership in the UK illustrate how value perspectives can be included in business cases for NBS, also signposting the need to account for potential future changes using scenario planning.
{"title":"The benefits of Nature Based Systems in a changing and uncertain world","authors":"R. Ashley, B. Horton, L. Walker, C. Digman, P. Shaffer, S. Herk","doi":"10.1680/jensu.21.00102","DOIUrl":"https://doi.org/10.1680/jensu.21.00102","url":null,"abstract":"Multi-functional nature-based solutions (NBS) can help urban areas become more climate proof, adaptable, and provide a range of societal goals. Alongside chronic impacts from climate change, the Covid-19 pandemic has illustrated the disruption that unexpected and acute shocks can bring to society. Measures like NBS can help reduce the vulnerability of urban areas and increase resilience. Traditional infrastructure planning relies on strong business cases to demonstrate the economic value of a scheme. Numerous approaches assign economic value to the benefits from using NBS. However, this value is more than can be accounted by traditional finance methods as there are many different perspectives on ‘value’. Decision making processes for selection of NBS measures require stronger integration of these value perspectives. This paper considers these perspectives in the business models that are being used in the decision processes regarding use and selection of NBS. Examples are drawn from case studies in the EU BEGIN project and also from the Living With Water (LWW) partnership in the UK illustrate how value perspectives can be included in business cases for NBS, also signposting the need to account for potential future changes using scenario planning.","PeriodicalId":49671,"journal":{"name":"Proceedings of the Institution of Civil Engineers-Engineering Sustainability","volume":"8 1","pages":""},"PeriodicalIF":1.2,"publicationDate":"2022-08-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79483126","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-08-01DOI: 10.1680/jensu.2022.175.4.165
Carrie Behar, Judith Sykes
{"title":"Editorial: Social value in infrastructure","authors":"Carrie Behar, Judith Sykes","doi":"10.1680/jensu.2022.175.4.165","DOIUrl":"https://doi.org/10.1680/jensu.2022.175.4.165","url":null,"abstract":"","PeriodicalId":49671,"journal":{"name":"Proceedings of the Institution of Civil Engineers-Engineering Sustainability","volume":"78 1","pages":""},"PeriodicalIF":1.2,"publicationDate":"2022-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80239016","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
R. Premkumar, Chokkalingam Ramesh Babu, V. Athira, A. Bahurudeen, M. Shanmugasundaram
Alkali activated binders are emerging sustainable binders in the construction sector due to their higher strength and superior resistance against aggressive environments than cement concrete. Steatite powder is obtained as a by-product from soapstone processing and disposed of as waste in large quantities. Studies on the reuse of steatite powder in alkali-activated concrete are highly narrow. Hence, the current research majors on the influence of ultra-fine steatite powder on the mechanical as well as durability properties of slag and fly ash-based alkali-activated concrete. Six replacement levels (10, 20, 30, 40, 50, and 60%) of slag and fly ash with steatite powder were adopted and activated using sodium-based activator. Heat curing and ambient curing were performed for fly ash-steatite concrete and slag-steatite concrete, respectively. From the test results, 30% steatite powder is optimum in slag and fly ash-based alkali-activated concretes. Lesser water absorption and higher resistance against acid exposure are observed for steatite used alkali-activated concrete specimens.
{"title":"Influence of ultrafine steatite powder on the mechanical and durability properties of alkali-activated concrete","authors":"R. Premkumar, Chokkalingam Ramesh Babu, V. Athira, A. Bahurudeen, M. Shanmugasundaram","doi":"10.1680/jensu.21.00103","DOIUrl":"https://doi.org/10.1680/jensu.21.00103","url":null,"abstract":"Alkali activated binders are emerging sustainable binders in the construction sector due to their higher strength and superior resistance against aggressive environments than cement concrete. Steatite powder is obtained as a by-product from soapstone processing and disposed of as waste in large quantities. Studies on the reuse of steatite powder in alkali-activated concrete are highly narrow. Hence, the current research majors on the influence of ultra-fine steatite powder on the mechanical as well as durability properties of slag and fly ash-based alkali-activated concrete. Six replacement levels (10, 20, 30, 40, 50, and 60%) of slag and fly ash with steatite powder were adopted and activated using sodium-based activator. Heat curing and ambient curing were performed for fly ash-steatite concrete and slag-steatite concrete, respectively. From the test results, 30% steatite powder is optimum in slag and fly ash-based alkali-activated concretes. Lesser water absorption and higher resistance against acid exposure are observed for steatite used alkali-activated concrete specimens.","PeriodicalId":49671,"journal":{"name":"Proceedings of the Institution of Civil Engineers-Engineering Sustainability","volume":"49 1","pages":""},"PeriodicalIF":1.2,"publicationDate":"2022-07-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85765761","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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