Experimental study on performances of silty clay stabilized by solidification agent

Some kind of silty clay near one highway in Henan Province was taken as subgrade material, and 7 d unconfined compressive strength was firstly tested, which increased markedly when it was mixed with solidification agent. Secondly some samples were prepared with different mix proportions (mass proportion of cement, solidification agent and silty clay). The influences of cement and solidification agent on the maximum dry density, optimum moisture content, 7 d and 28 d unconfined compressive strength, and 28 d indirect tensile strength were investigated, and the mix proportion of 4:8:88 was selected as the best proportion based on the test results and economical factors. Finally, as to this best mix proportion, delay time and dry shrinkage properties were tested indoors, microscopic analysis was made from the SME picture, some in-situ investigations were made at the selected 100 m segment in the above-mentioned highway subgrade. All results reveal that the mixtures have better integrity, strength and pavement performances.