灰土 (九州) の土質化学的諸性質と石灰安定処理
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概要
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Ashy soil (common name) is distributed abundantly near Uekicho in Kumamoto-ken where a portion of Kyushu Express-Way is being constructed. Its texture is clay originated in volcanic fragmental rock and its moisture content is only about 50 percent of Tachikawa loam (a kind of Kanto loam) that is clay originated in volcanic ash. But its trafficability or sensitivity decreases extremely by remolding, not at all inferior to Tachikawa loam. This paper deals with ashy soil which has peculiar properties as described above comparing Tachikawa loam and its stabilization by lime from the geochemical viewpoint. And it is disclosed that the difference of moisture content is related to the difference of kinds of clay minerals contained in these soils, Namely, in ashy soil, halloysite which has small specific surface area is contained, in Tachikawa loam, allophane which has large one. On the other hand, it seems most reasonable to conclude that the large sensitivity of ashy soil is related to the structure as follows. When not remolded, halloysite particles have structute like double T, but when remolded once the structure is broken very easily and most of void water changes to free water. This phenomena was confirmed by pF measurement of the soil water. Moreover, concernning in the chemical improvement of ashy soil, some experiments using three kinds of lime such as calcium oxide, calcium hydroxide and refuse of carbide was undertaken in laboratory and field. And it has been found that calcium oxide is the best of them. These geochemical studies could offer useful suggestions to understand the physical and mechanical properties of the soil and to interpret the effect of lime stabilization.
- 日本粘土学会の論文
- 1969-11-20