{"title":"Valorization of bottom ash in concrete: serviceability, microstructural and sustainability characterization","authors":"Nitin Ankur, Navdeep Singh","doi":"10.1680/jmacr.23.00313","DOIUrl":null,"url":null,"abstract":"The present study investigated the synergistic influence of bottom ash as a Portland cement (PC) and natural fine aggregate (NFA) replacement in concrete. Coal bottom ash (CBA) is a heavy ash that settles at bottom of combustion chamber of a thermal power plant and was grinded (GCBA) for two hours prior to replacing 10-30% PC whereas CBA was used in raw form to replace 25% and 50% NFA. The mechanical properties along with durability properties (accelerated carbonation and chloride penetration) were studied after 28 day and 90 days curing. Non-destructive tests were also performed to check the quality of CBA based concrete. Microstructural characterization was conducted using various techniques like XRD, SEM and FTIR. The concrete with 20% GCBA and 25% CBA (G20C25) reported best performance in terms of parameters studied owing to pozzolanic reactivity of GCBA and filler effect of fine CBA. The microstructural investigations also validated the findings and trends observed of experimental results. Well fitted mathematical models were derived and optimisation was carried out using desirability function approach. Multi-objective optimization recommended 21.80% GCBA and 24.17% CBA as the optimum amount resulting in significant reduction of 19.19% and 18.19% in carbon footprints and eco-costs compared to control mix.","PeriodicalId":1,"journal":{"name":"Accounts of Chemical Research","volume":"104 49","pages":""},"PeriodicalIF":16.4000,"publicationDate":"2024-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Accounts of Chemical Research","FirstCategoryId":"5","ListUrlMain":"https://doi.org/10.1680/jmacr.23.00313","RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"CHEMISTRY, MULTIDISCIPLINARY","Score":null,"Total":0}
引用次数: 0
Abstract
The present study investigated the synergistic influence of bottom ash as a Portland cement (PC) and natural fine aggregate (NFA) replacement in concrete. Coal bottom ash (CBA) is a heavy ash that settles at bottom of combustion chamber of a thermal power plant and was grinded (GCBA) for two hours prior to replacing 10-30% PC whereas CBA was used in raw form to replace 25% and 50% NFA. The mechanical properties along with durability properties (accelerated carbonation and chloride penetration) were studied after 28 day and 90 days curing. Non-destructive tests were also performed to check the quality of CBA based concrete. Microstructural characterization was conducted using various techniques like XRD, SEM and FTIR. The concrete with 20% GCBA and 25% CBA (G20C25) reported best performance in terms of parameters studied owing to pozzolanic reactivity of GCBA and filler effect of fine CBA. The microstructural investigations also validated the findings and trends observed of experimental results. Well fitted mathematical models were derived and optimisation was carried out using desirability function approach. Multi-objective optimization recommended 21.80% GCBA and 24.17% CBA as the optimum amount resulting in significant reduction of 19.19% and 18.19% in carbon footprints and eco-costs compared to control mix.
期刊介绍:
Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance.
Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.