多孔質無機材料の耐凍害性評価における既往の試験法の適用

抄録

Resently, porous inorganic materials have been used in cold regions because of their excellent heat insulations. However, the behavior against frost has not been clalified. In the study reported herein, evaluation methods for the frost resistance of porous inorganic material is examined. Some hundamental information of frost damage is provided in order to establish standared test method. Analysis of test result revealed that : (1) All the material that absorbs much water has low frost resistance, but all the material that does not absorb much water does not have high frost resistance. (2) At room temperature, ALC specimen can not reach the value of critical degree of saturation except in the case of very thin external layer of specimen. (3) Pumping effect of freezing is not clear, with water content between the freezing-thawing test and water absoption test. (4) The ice that is remained in the specimen is supposed to cause severe and sudden damage.