火山灰粘性土のアロフェン含有量がその石灰処理土の反応性と間隙分布に及ぼす影響

抄録

It has been known qualitatively that allophane clay mineral influences the engineering properties of volcanic cohesive soil and lime is very effective for the soil stabilization. Therefore, the influence of allophane content on the lime stabilized soil was investigated by measuring the reactivity, lime adsorption, and pore size distribution. The main results obtained are summarized as follows:
(1) Only hydrated halloysite is found in the soil containing allophane less than 50% and its reaction with lime produces hydrated gehlenite in 7 days of curing.
(2) The optimum lime requirement increases with increasing allophane content.
(3) The maximum amount of lime adsorption reaches at 14 days of curing, and it increases linearly with increasing allophane content.
(4) In the soils containing less than 40% of allophane minerals, both the maximum amount of lime adsorption and the pore volume less than 0.1μm linearly increase with increasing unconfined compressive strength.
(5) The pore volume within the pore diameter of 1-10μm increases linearly with increasing coefficient of permeability.