材齢6ヶ月までの改良土の力学特性に及ぼす物理，化学的性質の影響

抄録

In this study, the effect of physical and chemical properties on the long term mechanical property of surplus soils improved by lime and cement was investigated by conducting unconfined compression and needle penetration tests on the specimens cured under different conditions. The conditions of curing were set as sealed with plastic wrapping and soaked under pure and acidic water, respectively. As the result of the experiments after about 6 months (168 days) from specimen preparation, effect of soaking on the strengths appeared obviously in the cement treated soil. The unconfined compressive strengths of the soaked specimens were found to be the smallest, while those of the sealed specimens were the largest. It was suggested by the needle penetration resistance that local deterioration progressed gradually from the surface of the soaked specimens. It was inferred that these differences in the strengths between sealed and soaked curing were caused by the changes in physical properties such as degree of saturation, and chemical properties due possibly to the leaching of hydration products during soaked curing.