数種の建設材料の強度と膨潤に及ぼす界面エネルギの影響

概要

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It is well known that the strength and modulus of elasticity of the porous materials vary with surface tension when they are wetted by different kinds of liquids, and the moisture content in the materials has an important effect on their mechanical properties. The test program was carried out to investigate the effect of the surface energy of impregnating liquids on the strength, elastic modulus and swelling of the following materials; river sand mortar, aerated cement mortar, calcium silicate board, hardened gypsum (α-type), Japanese cypress and glass plate. In this test, four kinds of liquids which have different surface energies were used as follows; 72.8 erg/cm^2 (water), 64.4, 42.9 (blended liquid) and 22.5 (methanol). The effects of moisture content on the flexural, compressive and tensile strengths were examined at the following moisture content: 100%, 80, 60, 40, 20 and 0% (absolute dry). The test results show that the strengths of all the testing materials except the frosted glass plate decrease with increasing surface energy of impregnating liquids. Each material has its own particular surface energy dependence of strength. The swelling of length in the cementitious materials and gypsum specimens increases with increasing surface energy of liquid. It is considered that the cause of the strength reduction of material is lowering of interfacial energy (γ_<SL>).
1983-02-15