| 摘要 |
PROBLEM TO BE SOLVED: To provide a deterioration hysteresis determination method for a light-weight cellular concrete (ALC) capable of determining, totally and in detail, the durability of the ALC that has been used over the years. SOLUTION: Steam adsorption isotherms in adsorption and desorption are acquired as to one part collected from the ALC, and the levels of hysteresis in the obtained steam adsorption isotherms serve as a deterioration history in the ALC. This method determines that the ALC, of which the hysteresis (1-Wa/Wd) in the steam adsorption isotherm obtained, based on an equilibrium moisture content Wa at 0.6 of the relative pressure in the adsorption, and based on an equilibrium moisture content Wd at 0.6 of the relative pressure in desorption, is 0.1 or larger, as having gone through a moderate deterioration history, and determines that the ALC of which the hysteresis (1-Wa/Wd) to be 0.075 or smaller, as having gone through an abrupt deterioration history. COPYRIGHT: (C)2007,JPO&INPIT
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