酸性雨が化学安定処理土の耐久性に及ぼす影響

Abstract

The infiltration and soak tests were conducted at different pH levels of artificial acid rain to experimentally simulate the erosion process on stabilized soils, which were used at parts of the subgrade and base course. The authors used three types of lime and cement stabilized soils, and focused on the physico-chemical and engineering behaviors of the eroded soils. Results obtained show that the pH values of the lime and cement stabilized soils generally decreased with continuous infiltration or soak and that these decreases were greater under a higher acid condition. A large reduction of the unconfined compressive strength obtained from the specimens eroded by the higher acid rain was observed in comparison to ones eroded by the weaker acid rain. In particular, the unconfined compressive strength of the lime stabilized decomposed granite soil (LDGS) eroded by the acid rain with pH 2.0 decreased to 1/6 of its initial value after a small flux of infiltration.