Abstract: Through unconfined compressive strength test of soil-sand-cement in laboratory, its development rules in different sand contents and different curing ages are studied. The experimental results indicate that the mixing with a certain amount of sand can significantly increase the strength of cement-soil under a certain cement content condition. When the cement content is 10%, the sand content is 50% reaching maximum strength. And according to the measured stress-strain curves, through detailed analysis of the soil-sand-cement failure modes, it is brittle shearing damage. Moreover, with the increasing amount of sand content, the shear angle of the soil-sand-cement admixture increases gradually. At the same time, the reasons for unconfined compressive strength of soil-sand-cement admixture growth are analyzed from different viewpoints, so as to provide test data and theoretical basis for the practical application of engineering

Key words: soil-sand-cement admixture, unconfined compressive strength, sand content, curing age, stress-strain curve, destruction feature