Abstract
Two fly ashes and one milled bottom ash that do not meet standard specification requirements per ASTM C618 (commonly termed as off-spec) were investigated for their use in preventing alkali-silica reaction (ASR). The ashes were characterized for their chemical composition, pozzolanic reactivity, and particle size distribution. A very-highly reactive fine aggregate was used in this study. The accelerated mortar bar test (AMBT) was done at two different replacement levels of 25% and 50% of ordinary portland cement (OPC) using the off-spec ashes. The AMBT results showed that only one mixture was able to prevent deleterious ASR. Also, the mixture with 25% ash had a high sulfate content showed higher expansion than the control (100% OPC) mixture. The miniature concrete prism test (MCPT) was also used to evaluate this mixture for up to 56 days. Further, the mixtures were investigated to differentiate ASR expansions and the potential for other deleterious chemical reactions from alkalis and sulfates in the ashes. The results of this study highlight the need for supplemental test methods to standard ASR accelerated test methods to evaluate the efficacy of off-spec ashes for ASR prevention.
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Parashar, A., Chopperla, K.S.T., Ideker, J.H. (2023). Investigating the Use of Off-Specification Ashes to Prevent Alkali-Silica Reaction. In: Escalante-Garcia, J.I., Castro Borges, P., Duran-Herrera, A. (eds) Proceedings of the 75th RILEM Annual Week 2021. RW 2021. RILEM Bookseries, vol 40. Springer, Cham. https://doi.org/10.1007/978-3-031-21735-7_29
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