Abstract
In this study, in order to clarify the effect of lime soil stabilization of acid sulfate soil, two kinds of soil samples (acid sulfate soil generated gypsum, and Fukakusa standard soil) mixed with calcium hydroxide at different mixture rate were investigated by pH tests, unconfined compression tests and scanning electron microscope observations. The following main conclusions are obtained from the present study: 1. Since acid sulfate soil contains many acid things such as sulfuric acid ion (SO42-) etc., most of the calcium hydroxide in soil is used by neutralization. 2. The lime-treated soils become strong gradually by increase of mixture rate and curing period and become brittle material. 3. The strength property of the lime-treated soils is closely linked to the formation state of etrringites.
