Laboratory Tests on Long-Term Strength of Cement Treated Soil

Many soil admixture stabilization methods have been developed and used for many on-land and marine constructions in the world, in which soft clayey or sandy soil is mixed with a chemical stabilizing agent such as cement or lime. Various studies have been conducted on subjects such as the physical and mechanical properties of treated soil and the interaction between treated soil and untreated soil. The authors started research projects on the long-term strength change of cement treated soil under several exposure conditions. In this study, the strength distribution within the treated soil exposed to fresh water, seawater, and untreated clay was measured to investigate the influence of the exposure conditions on the decrease in strength and the expansion of the deteriorated area within the soil. The calcium content distributions in the specimens were also measured on the treated soil to investigate the mechanism of strength reduction by comparing with the strength distribution.