Experimental Analysis on the Properties of Different Cement-Soils with Different Cement Content and Curing Times

Through laboratory tests of unconfined compressive strength (UCS) on the five types of cement-soils with different cement contents and curing times, the stress-strain curves and the UCSs of different cement-soils were obtained. The influence of boundary conditions on the UCS of silt cement-soil was analyzed. Moreover, the curve fitting equations of the five different cement-soils with different cement contents and curing times were given. Test results indicate that the stress-strain curve of cement-soil consists of ascending and descending parts. Comparisons of the peak strain of different cement-soils show that the gravel cement-soils have the minimum peak strains, around 0.01, while the peak strains of other cement-soils (silver sand cement-soil, silt cement-soil, clay cement-soil and muck cement-soil, respectively) are around 0.016 similar to 0.03. The UCS of silt cement-soil without both ends oiled is larger than that with both ends oiled, and the strength ratio is about 1.1 similar to 1.2. Less than 60 days, the UCS of cement-soil increases remarkably with the increasing curing time. The ratios of the secant modulus E-50 to the UCS f(cu) are about 25 to 140 and are slightly influenced by the curing time.