塩を含むALCの平衡含水率の測定とモデリング

Abstract

This paper reports on measurements of water sorption isotherm of AAC (Autoclaved Aerated Concrete), commonly called ALC (Autoclaved Light-weight Concrete) in Japan, that contains salt (sodium chloride or magnesium chloride) water with a concentration that is low to saturated with undissolved salt in the material. The definitions of important parameters of porous materials that contain salt are clearly described. Measurement results confirm significant impacts of salt on sorption isotherm particularly at high salt concentrations. The measured sorption isotherm is modeled with the existing model that considers vapor pressure depression and the density of salt water. It is shown that differences between the measurement and the model increase with an increase of the amount of undissolved salt. Therefore, a modified model of water sorption isotherm for materials that do not only contain salt water but also undissolved salt is proposed and discussed. The modified model shows better agreement with the measurement.