Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Study on Concrete Developed with Recycled Fine Aggregate
Limited resources and exponentially growing demand of natural fine aggregate (NFA) in construction industry is creating environmental anarchy. Concurrently, construction and demolition waste (CD-W) that has potential of providing aggregates for construction activities is abundantly consuming valuable land spaces for years. Thus, current study aims to investigate feasibility of recycled fine aggregates (RFA) obtained from CD-W as NFA saver in concrete. Conventional drawbacks of RFA that limited its utilization in concrete are resolved in the study by adopting dissimilar RFA procurement by crushing recycled coarse aggregates (RCA). Different percentages of NFA were replaced with RFA in the concrete with identical proportions of water–cement ratio, coarse aggregate, fine aggregate, super-plasticizer and silica fume to observe effects of replacement on slump value, compressive strength, water absorption and bulk density. Workability was found to be reduced at higher NFA replacements with RFA due to its higher water absorption characteristics. To counter the raised water requirement, copper slag (CS) which is known as low water absorbing industrial waste was also used as a replacement of NFA in combination with RFA. Concrete with increasing replacements have presented superior compressive strength, which is also justified by XRD and SEM analysis that showed relatively more C–S–H gel formation in concrete with RFA. Sustainability analysis of concrete with RFA exhibited lower embodied energy (EE) and CO2 equivalent along with superior mechanical strength.
Study on Concrete Developed with Recycled Fine Aggregate
Limited resources and exponentially growing demand of natural fine aggregate (NFA) in construction industry is creating environmental anarchy. Concurrently, construction and demolition waste (CD-W) that has potential of providing aggregates for construction activities is abundantly consuming valuable land spaces for years. Thus, current study aims to investigate feasibility of recycled fine aggregates (RFA) obtained from CD-W as NFA saver in concrete. Conventional drawbacks of RFA that limited its utilization in concrete are resolved in the study by adopting dissimilar RFA procurement by crushing recycled coarse aggregates (RCA). Different percentages of NFA were replaced with RFA in the concrete with identical proportions of water–cement ratio, coarse aggregate, fine aggregate, super-plasticizer and silica fume to observe effects of replacement on slump value, compressive strength, water absorption and bulk density. Workability was found to be reduced at higher NFA replacements with RFA due to its higher water absorption characteristics. To counter the raised water requirement, copper slag (CS) which is known as low water absorbing industrial waste was also used as a replacement of NFA in combination with RFA. Concrete with increasing replacements have presented superior compressive strength, which is also justified by XRD and SEM analysis that showed relatively more C–S–H gel formation in concrete with RFA. Sustainability analysis of concrete with RFA exhibited lower embodied energy (EE) and CO2 equivalent along with superior mechanical strength.
Study on Concrete Developed with Recycled Fine Aggregate
Lecture Notes in Civil Engineering
Gupta, Ashok Kumar (Herausgeber:in) / Shukla, Sanjay Kumar (Herausgeber:in) / Azamathulla, Hazi (Herausgeber:in) / Soni, Nancy (Autor:in) / Shukla, Dharmendra Kumar (Autor:in)
15.12.2021
18 pages
Aufsatz/Kapitel (Buch)
Elektronische Ressource
Englisch
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