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Suspended hydration and loss of freezable water in cement pastes exposed to 90% relative humidity
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 degree C that occurs in the range 1-14 days for the pastes studied. The Jennings colloidal microstructural model is used to argue that the -30 degree C peak coincides with the cessation of capillary pore percolation. Alternatively, all samples cured under 100% RH conditions for 7 days prior to 90% RH exposure hydrated at the same rate as those continuously exposed to 100% RH. The application of these results to the formulation of separate curing practices for durability and strength is discussed. Published by Elsevier Ltd.
Suspended hydration and loss of freezable water in cement pastes exposed to 90% relative humidity
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 degree C that occurs in the range 1-14 days for the pastes studied. The Jennings colloidal microstructural model is used to argue that the -30 degree C peak coincides with the cessation of capillary pore percolation. Alternatively, all samples cured under 100% RH conditions for 7 days prior to 90% RH exposure hydrated at the same rate as those continuously exposed to 100% RH. The application of these results to the formulation of separate curing practices for durability and strength is discussed. Published by Elsevier Ltd.
Suspended hydration and loss of freezable water in cement pastes exposed to 90% relative humidity
Snyder, K.A. (Autor:in) / Bentz, D.P. (Autor:in)
Cement and Concrete Research ; 34 ; 2045-2056
2004
12 Seiten, 34 Quellen
Aufsatz (Zeitschrift)
Englisch
Suspended hydration and loss of freezable water in cement pastes exposed to 90% relative humidity
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