A study of restraint techniques for cement treated soil's deterioration by microbial functions

Abstract

Cement treated soil is used as a countermeasure for poor ground. But, cement treated soil deteriorate by calcium leaching because of exposing seawater. This study considered a technology of reducing deterioration of cement treated soil by using urease-producing bacteria. Authors tested seawater exposure tests using 2 types of the urease-producing bacteria of Sporosarcina aquimarina isolated from the sea off the coast of Korea and Bacillius pasteurii isolated from land. The purpose of those tests is checking effect of reducing deterioration of cement treated soil by the urease-producing bacteria. At the same time, we performed tests to confirm the growth of the bacteria in cement treated soil. We tested seawater exposure tests 2 types of conditions of temperature 20°C is used for exposure tests, and 30°C is a temperature that is suitable for the growth of bacteria, the purpose of those tests is checking relation temperature and deterioration speed. The main outcomes are as follows: 1) 2 types of the urease-producing bacteria have an effect of reducing deterioration 2) 2 types of condition of temperature have relation to deterioration speed.