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- W171538882 abstract "This chapter examines the hydration products in Portland cement pastes mixed with metakaolin (MK) replacement using differential scanning calorimetry (DSC). The DSC used for the investigation has high temperature sensitivity, but the accuracy of the enthalpy measurement is limited to approximately 20% relative error. Samples were analyzed at two ages, 230 and 420 days, after storing continuously under water at 20°C from one day after mixing. The DSC measures the energy change of the dehydration or dehydroxylation reactions rather than the weight loss or differential temperature. The results showed that there was no significant change between the two ages, indicating that no significant reaction had occurred, including in particular the pozzolanic reaction. Calculation showed that with 15% or higher metakaolin replacement, there should be no calcium hydroxide left in the system after hydration and pozzolanic reactions are complete. The increase of metakaolin level from 20% to 30% replacements pushed up the crystallization temperatures." @default.
- W171538882 created "2016-06-24" @default.
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- W171538882 date "2002-01-01" @default.
- W171538882 modified "2023-10-18" @default.
- W171538882 title "Differential scanning calorimetry study of the hydration products in portland cement pastes with metakaolin replacement" @default.
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- W171538882 doi "https://doi.org/10.1016/b978-008044100-9/50111-x" @default.
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