Abstract
Microstructural aspect of the Critical Degree of Saturation for Freeze/Thaw Resistance (Scr) of Autoclaved Lightweight Concrete (ALC) was studied. Measurement of the phase transition of adsorbed water, length chage during freezing and the cryo-SEM observation of the microscopic ice segregation on air pores were carried out. It was proven that Scr is a moisture content slightly higher than capillary saturation, and an analytical formula of Scr as a function of bulk density of ALC was derived.
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