Journal of Japan Society of Civil Engineers, Ser. E2 (Materials and Concrete Structures)
Online ISSN : 2185-6567
ISSN-L : 2185-6567
Paper (In Japanese)
A NEW MODEL FOR PREDICTING EFFECTIVE MOISTURE DIFFUSIVITY OF CEMENT MATERIALS USING ISOTHERMAL THERMO-GRAVIMETRIC ANALYSIS
Hideyuki UTSUMI
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2011 Volume 67 Issue 3 Pages 374-383

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Abstract

 A new model was proposed to estimate effective diffusion coefficients of moisture under the internal vaporization condition. The proposed model assumed a two-layer model of dried and saturated region inside the porous sample. The model is formulized by utilizing the relative relationship of the results of isothermal thermo-gravimetric analysis obtained from the saturated porous sample and the free water in liquid condition. The present model was applied to the measurement results of hardened cement pastes with a variety of types of water cement ratio (W/C), resulting in effective diffusion coefficients being estimated ranging from 5.31*10-6 to 8.99*10-6 [m2/s] when W/C was 0.3 to 0.5.

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© 2011 by Japan Society of Civil Engineers
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