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- W4385691941 abstract "Accelerated testing of alkali silica reaction (ASR) in concrete at elevated temperatures of 38 and 60 °C has an unknown impact on the alkali metal distribution in the cement paste. This paper investigates how the alkali metals released from hydrating Portland cement, limestone, and SCMs distribute between non-reactive and unreacted phases, C-A-S-H, and the pore solution. The SCMs investigated were fly ash and a volcanic pozzolan. The hydrate assemblage and pore solution of cement pastes cured at 20, 38 and 60 °C were analysed and related to the expansion of concrete prisms. There is little difference in alkali metal distribution at 20 and 38 °C, whereas curing at 60 °C has a large impact for the SCM containing blends. At alkali metal concentrations in the pore solution below 0.5 mol/L (Na + K) expansion of concrete was suppressed. Pore solution analysis could be used to screen new SCMs for ASR mitigation." @default.
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- W4385691941 date "2023-11-01" @default.
- W4385691941 modified "2023-10-14" @default.
- W4385691941 title "Alkali metal distribution in composite cement pastes and its relation to accelerated ASR tests" @default.
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- W4385691941 doi "https://doi.org/10.1016/j.cemconres.2023.107283" @default.
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