TY - JOUR
T1 - Using Supplementary Cementitious Materials to Mitigate Alkali-Silica Reaction in Concrete with Recycled-Concrete Aggregate
AU - Adams, Matthew P.
AU - Ideker, Jason H.
N1 - Funding Information:
This project was funded by a grant from the Oregon Transportation Research and Education Consortium (OTREC). Their support is greatly appreciated.
Publisher Copyright:
© 2020 American Society of Civil Engineers.
PY - 2020/8/1
Y1 - 2020/8/1
N2 - 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.
AB - 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.
KW - Accelerated mortar bar test
KW - Alkali-silica reactivity (ASR)
KW - Concrete
KW - Recycled concrete aggregate (RCA)
KW - Supplementary cementing materials (SCM)
KW - Sustainable construction
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U2 - 10.1061/(ASCE)MT.1943-5533.0003277
DO - 10.1061/(ASCE)MT.1943-5533.0003277
M3 - Article
AN - SCOPUS:85085712095
SN - 0899-1561
VL - 32
JO - Journal of Materials in Civil Engineering
JF - Journal of Materials in Civil Engineering
IS - 8
M1 - 04020209
ER -