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      • Cement系固化材에 依한 軟弱粘土의 性質改良

        趙誠正,高山昌照 충북대학교 농업과학기술연구소 1994 農業科學硏究 Vol.11 No.2

        The frail clay that liguid index was 1 and over became in liquid phase by kneading with water. Excavating the frail ground that the level of water table was high, there were various problems in construction works. This study was conducted to investigate in laboratory test the revelation of strength of the improved soils adding the hardening material of cement system (CEM) on frail clay. The amounts of hardening material of cement system used in this test were 40, 85, 100, 120 and 160 kgf/m2, and the ratio of water to hardening material of cement system(W/CEM ratio) were 0.4, 0.8, 1.2 and 1.6. The main results summarized were as follows ; 1. The strength of improved soil was influenced by the amount of CEM and W/CEM ratio. In case of more addition of CEM the strength of improved soil was high, adversely more W/CEM ratio, the increase of strength was low. Considering the revelation of strength and the embankment of improved ground in field, low W/CEM ratio was profitable. W/CEM ratio was determined from construction property obtainning the uniform improved soil. 2. The strength of improved soil was increased in type of hyperbola, in accordance with the longer period. Although the design was performed by the curing period of 28-day, the increase of strength was recognized in the curing period of 90 dyas and over. 3. The transformation coefficient was increased in proportion to compressive strength. The equations (2) (3) were recognized between both sides. Poisson's ratio was to the extent of 0.02-0.1. 4. The linear relations same as equations (4) - (9) were recognized on each of compressive strength-tensile strength, compressive strength-bending strength and tensile strength-bending strength. 5. The ratio of tensile strength to compressive strength was 1/4-1/5, whereas the ratio of bending strength to compressive strength was to the extent of 1/2-1/3.

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