Journal
CEMENT AND CONCRETE RESEARCH
Volume 34, Issue 11, Pages 2045-2056Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.cemconres.2004.03.007
Keywords
calorimetry; curing; degree of hydration (nominated); humidity; microstructure
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Degree of hydration (DOH) and differential scanning calorimetry (DSC) measurements are used to characterize the effect of early exposure to a 90% relative humidity (RH) environment on cement paste hydration. Early exposure to a 90% RH environment can lead to the consumption of freezable water and altered microstructural development. The minimum duration of 100% RH curing required to eliminate the effects of an unsaturated environment on microstructural development coincides with the appearance of a DSC peak near - 30 degreesC that occurs in the range 1-14 days for the pastes studied. The Jennings colloidal microstructural model is used to argue that the - 30 degreesC peak coincides with the cessation of capillary pore percolation. Alternatively, all samples cured under 100% RH conditions for 7 days prior to 90% RB exposure hydrated at the same rate as those continuously exposed to 100% RE. The application of these results to the formulation of separate curing practices for durability and strength is discussed. Published by Elsevier Ltd.
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