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• W3203726320 endingPage "124919" @default.
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• W3203726320 abstract "The Alkali-Silica Reaction (ASR) is a Portland Cement Concrete (PCC) distress of greater relevance worldwide, and several authors have successfully mitigated ASR with improved concrete mixture formulations. These concrete mixtures are mainly associated with incorporating Supplementary Cementitious Materials (SCM), which usually involve recycled materials or co-products from other processes, thus contributing to concrete production sustainability. Due to global warming and irreversible impacts on the planet, the circular economy and sustainability concepts are now of particular concern in the cement and concrete industry. Different ways to reduce the environmental impacts of Portland cement concrete include using SCM and Recycled Concrete Aggregates (RCA) to replace natural aggregates. Despite there are no concrete structures made with RCA that have been reported showing signs of ASR, it is essential to check the potential reactivity of RCA to take the necessary corrections to use them safely. This paper includes a laboratory investigation on mitigating the ASR of RCA in PCC production by using several SCM (fly ash, slag, and silica fume) to achieve a more sustainable material, reducing the production cost and the environmental load associated. Results indicate that replacement levels of fly ash (FA, 20%), slag (SL, 40%), and silica fume (SF, 10%) were able to mitigate the alkali-silica reaction of one source of RCA successfully. The optimum dosage of RCA is suggested to be between 25 and 50% (by weight of total coarse aggregate) for mixes containing fly ash and 50–100% for silica fume and slag mixes, respectively. The work also involves a life cycle assessment (LCA) to quantify the environmental benefits depending on the SCM used and the aggregate portion replaced by RCA on PCC mixtures. SCM and RCA in concrete mixtures significantly reduced greenhouse gas (GHG) emissions and energy demand due to lower Portland cement contents." @default.
• W3203726320 created "2021-10-11" @default.
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• W3203726320 date "2021-11-01" @default.
• W3203726320 modified "2023-10-14" @default.
• W3203726320 title "Sustainable concrete formulations to mitigate Alkali-Silica reaction in recycled concrete aggregates (RCA) for concrete infrastructure" @default.
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• W3203726320 doi "https://doi.org/10.1016/j.conbuildmat.2021.124919" @default.
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