セメント混合による土の凍上及び解凍沈下抑制に関する実験的研究

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Laboratory tests were conducted to investigate how much portland cement restrained a soil from frost heaving and thaw settlement when it had been added to the soil, using Fujinomori clay collected in Kyoto. They were prepared as follows : A slurry was made first by mixing thoroughly air-dried soil, portland cement and the proper amount of water necessary to make the slurry; next, it was let stand for 7 days to cure; then, a specimen was made in the shape of a column with two sizes : 5 cm in diameter and 10 cm in length; 10 cm in diameter and 4 cm in length. Let Wcs·denote the weight ratio in percentage of added cement to ovendried soil; V the initial volume of the specimen; ΔV the volume increment of the specimen after frost heaving; ζ the frost heave ratio in percentage (ζ=ΔV/V× 100); Vt the volume of the specimen after thawing; and ζs the thaw settlement ratio in percentage (ζs= (Vt-V) /V ×100). The value of e decreases to 1/81/4 times that of coment-free specimens when Wcs= 10%. The decrease in ζ is small when Wcs>10%. ζs is -2% for cement-free specimens; zero when Wcs =8%, and slightly positive when Wcs>8%. Theoretical consideration shows that a decrease in permeability of an unfrozen soil as a result of addition of cement leads to little decrease in ζ. Accordingly, it is suggested that a decrease in ζ comes about from a decrease in ability of the soil to absorb water because of the presence of cement in the soil. The tests reveal that mixing of soil with cement in the weight ratio of 10 : 1 restrains the mixture from frost heaving and thaw settlement.
社団法人日本雪氷学会の論文

セメント混合による土の凍上及び解凍沈下抑制に関する実験的研究

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