DETERIORATION MECHANISM OF CEMENT-TREATED SOIL UNDER SEAWATER

Abstract

 In order to investigate the calcium leaching mechanism of cement-treated soil under marine environment, leaching test was conducted. Artificial seawater, NaCl, MgCl₂, MgSO₄ solutions were used in the test. As a result, it was observed that calcium ion in cement-treated soil is leached by the salt containing magnesium ion in seawater. Specifically, calcium hydroxide in cement-treated soil turns into soluble form such as calcium chloride and calcium sulfate by reacting with magnesium ion, and this reaction reduces the pH value in cement-treated soil. Therefore, the mechanical and chemical characteristics of cement-treated soil immersed in seawater was investigated by micro cone penetration test and chemical component analysis. It was verified that the deterioration progress was based on calcium leaching under the influence of magnesium ion in seawater.