セメント硬化物の冷熱試験

概要

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In the Japanese Industrial Standards of electric insulator [JIS C 3801 (1953)], there is the method of repeated heating and cooling test for electric porcelain insulator. In the present paper, the tests were carried by test pieces of hardened neat Portland cement with or without adding fine powder of broken scrap electric insulater (Scherben), by comparing the percentage decrease of bending and compressive strengths. Considerable decrease of strength was observed, when the heating was carried at relatively high temperature (80·100°C) water bath, and on the contrary, very small decrease was observed, when heating was carried at relatively lower temperature (under 40·50°C) water bath. This effect of strength decrease by heating in water bath of high temperature was considered to be due to the change of crystallization water of hydrated compounds, e. g., xCaO⋅SiO2⋅yH2O, mCaO⋅Al2O3⋅nH2O, etc., in hardened cement, and carried out various comparison tests to discuss fully this effect.
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