Cement stabilized crushed stone semi-rigid base is widely used in the construction of highways in China.Based on its material characteristics and cracking mechanism,a new type of water stable mixture is developed by adding external additives.The shrinkage and crack resistance index was used as the main screening basis,and an innovative vibrating wire surface strain gauge is used to measure the shrinkage strain of the water stable mixture.Dry shrinkage,thermal shrinkage,flexural tension,and unconfined compressive strength tests were used to compare and screen the performance of the water stable mixture,and the optimal combination parameters of additives are obtained.The best additive material and process parameters are selected through comprehensive comparison and optimization.
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