CHANGE IN PERMEABILITY OF CEMENT-STABILIZED SAND DUE TO PASSAGE OF MAGNESIUM SOLUTION

Abstract

 The permeability of cement-treated soil is significantly reduced compared to the untreated soil by filling the voids with cement hydrate. However, recently it has been clarified that cement hydrates are decomposed by chemical erosion by seawater. Therefore, it is considered that the permeability of cement-treated soil changes when seawater infiltrates. In this study, Mg solution was permeable to cement-treated sandy soil as a substitute for seawater, and changes in permeability were investigated. As a result, it was shown that the permeability of cement-treated soil was significantly reduced. The decrease in permeability of cement-treated soil is caused by the decomposition of cement hydrates and the precipitation of magnesium hydroxides due to the Mg salt infiltrated into the treated soil. It is presumed that the pore volume decreased and the void with a small diameter that was difficult to penetrate increased.