Performance of Self-Compacting Concrete with Residue of Masonry and Recycled Aggregate under Sulfate Attack
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Date
2024
Journal Title
Journal ISSN
Volume Title
Publisher
American Society of Civil Engineers
Abstract
The use of byproducts as supplementary cementitious materials (SCMs) and recycled coarse aggregates (RCAs) can contribute tothe production of more sustainable self-compacting concrete (SCC) while modifying the durability properties of these mixtures. Thus, thisstudy addresses the combined use of concrete waste (CW) as RCA and residue of masonry (RM) as SCM, the CW and RM obtained fromconstruction and demolition waste, to generate SCC mixtures and to evaluate the performance of these mixtures under sulfate attack (5%Na2SO4and 5% MgSO4solutions). In detail, a reference SCC (M1) and three SCCs with 25% of RM and different level RCAs (0%, 50%, and100% replacement by volume) were cast. The hardened properties of the SCC mixtures were assessed in terms of compressive strength andsulfate attack. The results showed that the SCC mixtures with RM and RCA, cured in water, exhibited lower compressive strength results inall the evaluated ages compared with M1 (reference mixture, without RM and RCA). However, the SCC mixture with RM presented themaximum compression strength result among the different mixtures at 180 and 360 days. When mixtures were exposed to sulfate solutions,the SCC mixture with RM showed the best performance, and even the SCC mixtures with RM and RCA exhibited lower linear expansion andloss of compressive strength when compared with M1. The presence and severity of the sulfate attack were assessed via X-ray diffractionand scanning electron micrograph, which confirmed the presence of ettringite and gypsum in all the exposed SCC mixtures in the Na2SO4andMgSO4solutions.
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Keywords
Self compacting concrete (SCC), Residue of masonry (RM), Recycled coarse aggregate (RCA), Sulfate attack, Compressive strength