Abstract: In order to analyze the disease mechanism of subbase with cement stabilized weathered granite material and to optimize the material design, the influence of coarse aggregate content on soluble salt corrosion resistance was analyzed through properties tests of three kinds of coarse aggregate content cement stabilized weathered granite material under different curing conditions. Research results indicated that long-term water environment, especially soluble salt existing in water environment, would lead to rapid decay of cement stabilized weathered granite material properties. When coarse aggregate content was less than 20%, the material physical mechanic properties were very poor under the effect of soluble salt, but with coarse aggregate content increasing, material properties improved obviously under various conditions except that cleavage strength reduced slightly under standard curing condition. While coarse aggregate content increased from 20% to 30%, the material worked better in improving compressive ability, water and temperature stability under various environment, as well as tensile property and stiffness under long-term water environment. While coarse aggregate content increased from 30% to 40%, tensile property and stiffness improved more obviously under soluble salt corrosion environment.

Key words: road engineering, cement stabilized weathered granite material, corrosion resistance, coarse aggregate, stability of water and temperature