Abstract
Recycled concrete aggregate (RCA) is a key tool for improving sustainability in the construction and demolition industries. The use of RCA in new concrete is, in part, obstructed by the dearth of research available on the durability of RCA systems. This paper investigates the efficacy of replacing portland cement with supplementary cementitious materials (SCM), known to mitigate alkali-silica reaction (ASR) in concrete with virgin aggregates, as a method for reducing expansions related to ASR from reactive RCA. Fly ash (Class F), silica fume, and metakaolin were all investigated for their ability to mitigate ASR. The results of modified accelerated mortar bar tests are presented for two different RCAs when using 100% portland cement, binary blends of portland cement and fly ash, and ternary blends of portland cement, fly ash, and either metakaolin or silica fume. The results indicated that SCM can mitigate ASR in concrete made with RCA, though not as effectively as for natural aggregate systems. Higher levels of mitigation may be required for some RCAs, compared to the level necessary to mitigate or prevent ASR in concrete made with the original aggregates, depending on composition of the RCA.
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Acknowledgments
This project was funded by a grant from the Oregon Transportation Research and Education Consortium (OTREC). Their support is greatly appreciated.
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Published In
Journal of Materials in Civil Engineering
Volume 32 • Issue 8 • August 2020
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©2020 American Society of Civil Engineers.
History
Received: Aug 14, 2017
Accepted: Jan 22, 2020
Published online: May 26, 2020
Published in print: Aug 1, 2020
Discussion open until: Oct 26, 2020
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