Pub Date : 2022-09-05DOI: 10.1080/23789689.2022.2115263
Tathagata Roy, V. Matsagar
ABSTRACT Analytical framework for probabilistic assessment of dynamical system under base- and mass- excitations with equal input energy is presented with reference to multi-hazard engineering. Closed-form solutions for equivalent undamped and damped dynamical systems under harmonic sinusoidal base- and mass- excitations are obtained. Uncertainties are considered in the excitation frequency and peak amplitude for sinusoidal base excitations, whereas for the mass excitations, the input forcing functions have variations in excitation frequency, mean speed, and fluctuating wind speeds. Dynamic response quantities (acceleration and displacement) are obtained under the suite of stochastic base and mass excitation forces. Structural failure under the independent excitations is determined as joint probability density functions and fragility surfaces. Under equal input energy from such separate dynamic excitations, dissimilar vulnerability is exhibited by the structure when exposed to two independent time-dependent excitations, base-induced earthquake and mass-induced wind forces. Moreover, the uncertainty in the input excitation parameters has significant influence on the probability of failure in the design life of structure under the non-simultaneous excitations.
{"title":"Analytical stochastic framework for assessment of base- and mass-excited structures under equal input energy pertinent to multi-hazard engineering","authors":"Tathagata Roy, V. Matsagar","doi":"10.1080/23789689.2022.2115263","DOIUrl":"https://doi.org/10.1080/23789689.2022.2115263","url":null,"abstract":"ABSTRACT Analytical framework for probabilistic assessment of dynamical system under base- and mass- excitations with equal input energy is presented with reference to multi-hazard engineering. Closed-form solutions for equivalent undamped and damped dynamical systems under harmonic sinusoidal base- and mass- excitations are obtained. Uncertainties are considered in the excitation frequency and peak amplitude for sinusoidal base excitations, whereas for the mass excitations, the input forcing functions have variations in excitation frequency, mean speed, and fluctuating wind speeds. Dynamic response quantities (acceleration and displacement) are obtained under the suite of stochastic base and mass excitation forces. Structural failure under the independent excitations is determined as joint probability density functions and fragility surfaces. Under equal input energy from such separate dynamic excitations, dissimilar vulnerability is exhibited by the structure when exposed to two independent time-dependent excitations, base-induced earthquake and mass-induced wind forces. Moreover, the uncertainty in the input excitation parameters has significant influence on the probability of failure in the design life of structure under the non-simultaneous excitations.","PeriodicalId":45395,"journal":{"name":"Sustainable and Resilient Infrastructure","volume":null,"pages":null},"PeriodicalIF":5.9,"publicationDate":"2022-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42192131","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}
Pub Date : 2022-07-21DOI: 10.1080/23789689.2021.2015833
M. DeMenno, R. Broderick, Robert Jeffers
ABSTRACT In response to major system disruptions, policymakers have prioritized enhancing the resilience of the financial services and energy sectors, with a particular focus on banking and electricity regulation. In both sectors, ‘regulating for resilience’ requires bridging system-level policy goals and institution-level policy instruments as well as tailoring institutional requirements to firms’ idiosyncratic risk profiles. Stress testing has enabled financial regulators to partially overcome these analytical and governance challenges, resulting in better capitalized and managed banks, increased attentiveness to systemic risk, and a more resilient financial system. Recognizing the opportunity for translation across sectors and disciplines, this article develops a novel methodology and an actionable policy framework for embedding stress testing in electric utility investment strategies and regulatory processes. It demonstrates how stress testing could enhance the resilience and sustainability of the U.S. electric grid and explores opportunities for regulatory coordination in multi-sector analyses of climate-related risk and resilience.
{"title":"From systemic financial risk to grid resilience: Embedding stress testing in electric utility investment strategies and regulatory processes","authors":"M. DeMenno, R. Broderick, Robert Jeffers","doi":"10.1080/23789689.2021.2015833","DOIUrl":"https://doi.org/10.1080/23789689.2021.2015833","url":null,"abstract":"ABSTRACT In response to major system disruptions, policymakers have prioritized enhancing the resilience of the financial services and energy sectors, with a particular focus on banking and electricity regulation. In both sectors, ‘regulating for resilience’ requires bridging system-level policy goals and institution-level policy instruments as well as tailoring institutional requirements to firms’ idiosyncratic risk profiles. Stress testing has enabled financial regulators to partially overcome these analytical and governance challenges, resulting in better capitalized and managed banks, increased attentiveness to systemic risk, and a more resilient financial system. Recognizing the opportunity for translation across sectors and disciplines, this article develops a novel methodology and an actionable policy framework for embedding stress testing in electric utility investment strategies and regulatory processes. It demonstrates how stress testing could enhance the resilience and sustainability of the U.S. electric grid and explores opportunities for regulatory coordination in multi-sector analyses of climate-related risk and resilience.","PeriodicalId":45395,"journal":{"name":"Sustainable and Resilient Infrastructure","volume":null,"pages":null},"PeriodicalIF":5.9,"publicationDate":"2022-07-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49487280","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}
Pub Date : 2022-07-19DOI: 10.1080/23789689.2022.2097771
Yuvaraj Dhandapani, M. Santhanam
ABSTRACT In this article, the role of chloride transport parameters in the service life estimation of a reinforced concrete structure is discussed. This article also lists several qualitative and quantitative test methods used to measure resistance to ingress of chloride in concrete systems with their advantageous and critique properties. The relationship between the rapid assessment methods such as resistivity and the diffusion coefficient is put forward. A review of the ageing coefficient for different binder types is presented. The importance to characterise and account for the environmental factors such as exposure condition and ambient temperature variation is emphasised based on its impact on the chloride build-up rate. A parametric study is carried out to identify the role of different factors associated with chloride transport property in service life estimation. The prediction of chloride build-up rates for various binder composites based on analytical and numerical approaches is summarised along with relevant input parameters.
{"title":"On the correlations between different chloride transport parameters and their role in service life estimation","authors":"Yuvaraj Dhandapani, M. Santhanam","doi":"10.1080/23789689.2022.2097771","DOIUrl":"https://doi.org/10.1080/23789689.2022.2097771","url":null,"abstract":"ABSTRACT In this article, the role of chloride transport parameters in the service life estimation of a reinforced concrete structure is discussed. This article also lists several qualitative and quantitative test methods used to measure resistance to ingress of chloride in concrete systems with their advantageous and critique properties. The relationship between the rapid assessment methods such as resistivity and the diffusion coefficient is put forward. A review of the ageing coefficient for different binder types is presented. The importance to characterise and account for the environmental factors such as exposure condition and ambient temperature variation is emphasised based on its impact on the chloride build-up rate. A parametric study is carried out to identify the role of different factors associated with chloride transport property in service life estimation. The prediction of chloride build-up rates for various binder composites based on analytical and numerical approaches is summarised along with relevant input parameters.","PeriodicalId":45395,"journal":{"name":"Sustainable and Resilient Infrastructure","volume":null,"pages":null},"PeriodicalIF":5.9,"publicationDate":"2022-07-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45017447","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}
Pub Date : 2022-07-14DOI: 10.1080/23789689.2022.2094124
P. Barrette, Y. Hori, Amy M. Kim
ABSTRACT Winter roads are seasonal roads that only exist during the winter – they run over frozen land and frozen lakes and rivers. Many northern communities in Canada rely on them for their yearly supplies of bulk goods, including fuel and building supplies, which are too costly to ship by air. Because of a warming climate, a progressive shortening of the operational time windows is observed, and is predicted to continue based on climate model projections. Compared to all-season roads, winter roads are less well understood; they are also unevenly managed across Canada. This state of affairs represents a liability for Northerners and could be addressed via the systematic characterization of individual roads. This would help the assessment of community vulnerability and costs for remediation measures. It would also guide decision-making and prioritization.
{"title":"The Canadian winter road infrastructure in a warming climate: Toward resiliency assessment and resource prioritization","authors":"P. Barrette, Y. Hori, Amy M. Kim","doi":"10.1080/23789689.2022.2094124","DOIUrl":"https://doi.org/10.1080/23789689.2022.2094124","url":null,"abstract":"ABSTRACT Winter roads are seasonal roads that only exist during the winter – they run over frozen land and frozen lakes and rivers. Many northern communities in Canada rely on them for their yearly supplies of bulk goods, including fuel and building supplies, which are too costly to ship by air. Because of a warming climate, a progressive shortening of the operational time windows is observed, and is predicted to continue based on climate model projections. Compared to all-season roads, winter roads are less well understood; they are also unevenly managed across Canada. This state of affairs represents a liability for Northerners and could be addressed via the systematic characterization of individual roads. This would help the assessment of community vulnerability and costs for remediation measures. It would also guide decision-making and prioritization.","PeriodicalId":45395,"journal":{"name":"Sustainable and Resilient Infrastructure","volume":null,"pages":null},"PeriodicalIF":5.9,"publicationDate":"2022-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44572843","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}
Pub Date : 2022-07-13DOI: 10.1080/23789689.2022.2094125
P. Lin, Arnold Yuan, Kainan Li, Henry Fang
ABSTRACT Pedestrian sidewalk plays an increasingly important role in urban transportation. Due to the traditional misconception of it being an infrastructure class of low risk, the current sidewalk asset management still largely relies on experiences and personal judgment. To promote rational asset management, the authors have recently developed two performance indicators namely, the maintenance repair index (MRI) and the sidewalk condition index (SCI). This paper advances the effort by developing two deterioration models using a compound Poisson process (CPP), which consists of a nonhomogeneous Poisson process for the jumping time and a Weibull distribution for the jumping size. Based on a real-life sidewalk defects database, the models also consider the heterogeneity of the sidewalks by including asset attributes such as sidewalk service age, foundation soil type, sidewalk size, pedestrian density, and intensity of construction activities in the vicinity of a sidewalk. The modelling approach presented in the paper – particularly the considerations in the selection of CPP model, the Bayesian statistical inference method, and the model validation process – serves as an excellent example for stochastic deterioration modelling for risk-informed infrastructure asset management.
{"title":"Stochastic deterioration modelling of sidewalk performance using compound poisson processes","authors":"P. Lin, Arnold Yuan, Kainan Li, Henry Fang","doi":"10.1080/23789689.2022.2094125","DOIUrl":"https://doi.org/10.1080/23789689.2022.2094125","url":null,"abstract":"ABSTRACT Pedestrian sidewalk plays an increasingly important role in urban transportation. Due to the traditional misconception of it being an infrastructure class of low risk, the current sidewalk asset management still largely relies on experiences and personal judgment. To promote rational asset management, the authors have recently developed two performance indicators namely, the maintenance repair index (MRI) and the sidewalk condition index (SCI). This paper advances the effort by developing two deterioration models using a compound Poisson process (CPP), which consists of a nonhomogeneous Poisson process for the jumping time and a Weibull distribution for the jumping size. Based on a real-life sidewalk defects database, the models also consider the heterogeneity of the sidewalks by including asset attributes such as sidewalk service age, foundation soil type, sidewalk size, pedestrian density, and intensity of construction activities in the vicinity of a sidewalk. The modelling approach presented in the paper – particularly the considerations in the selection of CPP model, the Bayesian statistical inference method, and the model validation process – serves as an excellent example for stochastic deterioration modelling for risk-informed infrastructure asset management.","PeriodicalId":45395,"journal":{"name":"Sustainable and Resilient Infrastructure","volume":null,"pages":null},"PeriodicalIF":5.9,"publicationDate":"2022-07-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45365855","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}
Pub Date : 2022-06-08DOI: 10.1080/23789689.2022.2082644
E. Ahmadi, Sedef Kocakaplan, M. Kashani
ABSTRACT The use of precast post-tensioned segmental (PPS) piers is growing in the bridge industry, particularly in Accelerated Bridge Construction (ABC). To increase their use in high-seismicity regions, this study focuses on the seismic performance of the PPS piers under pulse-like near-field earthquakes. Two ensembles of 40 pulse-like near-field ground motions and 44 far-field ground motions along with three bridge piers of various heights are used in a series of incremental dynamic analyses. The piers are analysed under the original pulse-like near-field ground motions, their extracted pulse ground motions, and their corresponding non-pulse ground motions. It is found that the effect of the pulse ground motion is pronounced, when the pulse period is in proximity to the natural period of the pier. It is also seen that pulse-like near-field and far-field ground motions generally have similar effects on the response of PPS piers.
{"title":"Nonlinear seismic fragility analysis of a resilient precast post-tensioned segmental bridge pier","authors":"E. Ahmadi, Sedef Kocakaplan, M. Kashani","doi":"10.1080/23789689.2022.2082644","DOIUrl":"https://doi.org/10.1080/23789689.2022.2082644","url":null,"abstract":"ABSTRACT The use of precast post-tensioned segmental (PPS) piers is growing in the bridge industry, particularly in Accelerated Bridge Construction (ABC). To increase their use in high-seismicity regions, this study focuses on the seismic performance of the PPS piers under pulse-like near-field earthquakes. Two ensembles of 40 pulse-like near-field ground motions and 44 far-field ground motions along with three bridge piers of various heights are used in a series of incremental dynamic analyses. The piers are analysed under the original pulse-like near-field ground motions, their extracted pulse ground motions, and their corresponding non-pulse ground motions. It is found that the effect of the pulse ground motion is pronounced, when the pulse period is in proximity to the natural period of the pier. It is also seen that pulse-like near-field and far-field ground motions generally have similar effects on the response of PPS piers.","PeriodicalId":45395,"journal":{"name":"Sustainable and Resilient Infrastructure","volume":null,"pages":null},"PeriodicalIF":5.9,"publicationDate":"2022-06-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41984649","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}
Pub Date : 2022-05-06DOI: 10.1080/23789689.2022.2067951
V. Ranieri, S. Coropulis, N. Berloco, V. Fedele, P. Intini, Claudio Laricchia, P. Colonna
ABSTRACT The Urban Heat Island (UHI) phenomenon is commonly solved by implementing materials with optimal thermic and evapotranspiration properties which help decreasing the air temperature in dense urban areas. This approach has been applied in this study, testing six different materials (replacing the current Macadam) in one parking area in Bari (Italy), which provides a large-scale testbed, by means of a thermal three-dimensional non-hydrostatic simulation: impervious asphalt pavement (IAP), asphalt permeable pavement (APP), green pavement (GP), green pavement-asphalt permeable pavement (GP+APP), grey porous concrete blocks (GCB), and light concrete permeable pavement (LCPP). The highest-performance pavements in terms of potential air temperature (PAT) reduction were the GP (−1.22°C), GCB (−1.26°C) and LCPP (−1.22°C), which also showed a constant relative humidity, suggesting their UHI mitigation benefits. A comparison of the structural properties as well as the construction and maintenance costs of such pavements is also provided, finding the best mitigation strategy (GCB).
{"title":"The effect of different road pavement typologies on urban heat island: a case study","authors":"V. Ranieri, S. Coropulis, N. Berloco, V. Fedele, P. Intini, Claudio Laricchia, P. Colonna","doi":"10.1080/23789689.2022.2067951","DOIUrl":"https://doi.org/10.1080/23789689.2022.2067951","url":null,"abstract":"ABSTRACT The Urban Heat Island (UHI) phenomenon is commonly solved by implementing materials with optimal thermic and evapotranspiration properties which help decreasing the air temperature in dense urban areas. This approach has been applied in this study, testing six different materials (replacing the current Macadam) in one parking area in Bari (Italy), which provides a large-scale testbed, by means of a thermal three-dimensional non-hydrostatic simulation: impervious asphalt pavement (IAP), asphalt permeable pavement (APP), green pavement (GP), green pavement-asphalt permeable pavement (GP+APP), grey porous concrete blocks (GCB), and light concrete permeable pavement (LCPP). The highest-performance pavements in terms of potential air temperature (PAT) reduction were the GP (−1.22°C), GCB (−1.26°C) and LCPP (−1.22°C), which also showed a constant relative humidity, suggesting their UHI mitigation benefits. A comparison of the structural properties as well as the construction and maintenance costs of such pavements is also provided, finding the best mitigation strategy (GCB).","PeriodicalId":45395,"journal":{"name":"Sustainable and Resilient Infrastructure","volume":null,"pages":null},"PeriodicalIF":5.9,"publicationDate":"2022-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47995338","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}
Pub Date : 2022-05-05DOI: 10.1080/23789689.2022.2067950
H. Tran, W. Lokuge, W. Karunasena, S. Setunge
ABSTRACT Floodway structures are sections of roads that have been designed to be overtopped by floodwater and to fully return to serviceable level after the flood water recedes. They are an alternative cost-effective solution to bridges and culverts while they play a significant role in the economy of a country by connecting regional communities, farmlands and agricultural areas to urban cities. To support proactive asset management of floodway structures, this study developed a Markov deterioration model to predict the rate of deterioration for a network of floodway structures by using their visual inspection data. A computational algorithm has also been developed for estimating the lowest-cost inspection interval for floodway structures. A case study with real floodway structures is used to demonstrate its practical application. Effects of maintenance assumption, traffic count and underneath drainage culverts on deterioration rate of floodway network together with a budget estimation are the outcomes of this study.
{"title":"Markov-based deterioration prediction and asset management of floodway structures","authors":"H. Tran, W. Lokuge, W. Karunasena, S. Setunge","doi":"10.1080/23789689.2022.2067950","DOIUrl":"https://doi.org/10.1080/23789689.2022.2067950","url":null,"abstract":"ABSTRACT Floodway structures are sections of roads that have been designed to be overtopped by floodwater and to fully return to serviceable level after the flood water recedes. They are an alternative cost-effective solution to bridges and culverts while they play a significant role in the economy of a country by connecting regional communities, farmlands and agricultural areas to urban cities. To support proactive asset management of floodway structures, this study developed a Markov deterioration model to predict the rate of deterioration for a network of floodway structures by using their visual inspection data. A computational algorithm has also been developed for estimating the lowest-cost inspection interval for floodway structures. A case study with real floodway structures is used to demonstrate its practical application. Effects of maintenance assumption, traffic count and underneath drainage culverts on deterioration rate of floodway network together with a budget estimation are the outcomes of this study.","PeriodicalId":45395,"journal":{"name":"Sustainable and Resilient Infrastructure","volume":null,"pages":null},"PeriodicalIF":5.9,"publicationDate":"2022-05-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41403409","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}
Pub Date : 2022-03-11DOI: 10.1080/23789689.2022.2029325
R. Teixeira, Beatriz Martinez-Pastor, M. Nogal, A. O'Connor
ABSTRACT Different emerging threats highlighted the relevance of recovery and adaptation modelling in the functioning of societal systems. However, as modelling of systems becomes more complex, its effort increases challenging the practicality of the engineering analyses required for efficient recovery and adaptation. In the present work, metamodels are researched as a tool to enable these analyses in traffic networks. One of the main advantages of metamodeling is their synergy with the short decision times required in recovery and adaptation. A sequential global metamodeling technique is proposed and applied to three macroscopic day-to-day user-equilibrium models. Two reference contexts of application are researched: optimal recovery to a perturbation (with response times reduced by 98% with loss of accuracy lower than 1%) and adaptation under uncertainty with perturbation-dependent optimality. Results show that metamodeling-based metaheuristics enable fast resource-intensive engineering analyses of traffic recovery and adaptation, which may change the paradigm of decision-making in this field
{"title":"Metamodel-based metaheuristics in optimal responsive adaptation and recovery of traffic networks","authors":"R. Teixeira, Beatriz Martinez-Pastor, M. Nogal, A. O'Connor","doi":"10.1080/23789689.2022.2029325","DOIUrl":"https://doi.org/10.1080/23789689.2022.2029325","url":null,"abstract":"ABSTRACT Different emerging threats highlighted the relevance of recovery and adaptation modelling in the functioning of societal systems. However, as modelling of systems becomes more complex, its effort increases challenging the practicality of the engineering analyses required for efficient recovery and adaptation. In the present work, metamodels are researched as a tool to enable these analyses in traffic networks. One of the main advantages of metamodeling is their synergy with the short decision times required in recovery and adaptation. A sequential global metamodeling technique is proposed and applied to three macroscopic day-to-day user-equilibrium models. Two reference contexts of application are researched: optimal recovery to a perturbation (with response times reduced by 98% with loss of accuracy lower than 1%) and adaptation under uncertainty with perturbation-dependent optimality. Results show that metamodeling-based metaheuristics enable fast resource-intensive engineering analyses of traffic recovery and adaptation, which may change the paradigm of decision-making in this field","PeriodicalId":45395,"journal":{"name":"Sustainable and Resilient Infrastructure","volume":null,"pages":null},"PeriodicalIF":5.9,"publicationDate":"2022-03-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42980106","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}
Pub Date : 2022-03-11DOI: 10.1080/23789689.2022.2033938
H. Myadaraboina, C. Gunasekara, D. Law
ABSTRACT The addition of a small quantity of lime has been recommended to enhance the early strength of High-Volume Fly Ash Concrete. However, the quantity of lime may not be adequate in the case of Very High Volume Fly Ash Concrete (VHVFAC). This study compares the mechanical properties of VHVFAC with 80% cement replacement with ultrafine fly ash with the addition of lime and silica fume (SF), with that of PC concrete over a 90-day period. Correlation between the compressive strength and other mechanical properties of VHVFAC are presented. The use of SF enhanced the mechanical properties of the VHVFAC, with the increase more predominant at early age. VHVFAC exhibited similar mechanical performance with PC concrete by the end of the 90 days.
{"title":"Engineering properties of very high volume fly ash composite","authors":"H. Myadaraboina, C. Gunasekara, D. Law","doi":"10.1080/23789689.2022.2033938","DOIUrl":"https://doi.org/10.1080/23789689.2022.2033938","url":null,"abstract":"ABSTRACT The addition of a small quantity of lime has been recommended to enhance the early strength of High-Volume Fly Ash Concrete. However, the quantity of lime may not be adequate in the case of Very High Volume Fly Ash Concrete (VHVFAC). This study compares the mechanical properties of VHVFAC with 80% cement replacement with ultrafine fly ash with the addition of lime and silica fume (SF), with that of PC concrete over a 90-day period. Correlation between the compressive strength and other mechanical properties of VHVFAC are presented. The use of SF enhanced the mechanical properties of the VHVFAC, with the increase more predominant at early age. VHVFAC exhibited similar mechanical performance with PC concrete by the end of the 90 days.","PeriodicalId":45395,"journal":{"name":"Sustainable and Resilient Infrastructure","volume":null,"pages":null},"PeriodicalIF":5.9,"publicationDate":"2022-03-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42135841","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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