LABORATORY TEST STUDY ON MECHANICAL PROPERTIES OF ADDITIVE TO ORGANIC CEMENT RED CLAY IN GUILIN REGION

Red clay is a special soil that is formed from the carbonate rocks by weathering under the hot and humid environment. Its pores are large and can have high water contents. It has the character of strong two layer structure. The upper layer clay has the rigid and hard plastic condition and high bearing capacity. The lower layer clay is soft plastic, has flowing plastic condition and weak bearing capacity. The soft red clay needs treatment. This paper uses the soil-cement mixing method to treat the soft red clay. With the variation of the environment and conditions continuously, the red clay is polluted in large areas. And, the existence of the organic matter affects the strength of the foundation. But the test results show that reasonable application of the additives can improve the properties of cement red clay that has been polluted by organic matter. The test results include shear strength, compression coefficient and unconfined compressive strength of cemented clays and take into account the quantity of additives.