Study on low temperature performance of semi-flexiblepavement materials based on response surface method
In order to improve the low temperature crack resistance of semi-flexible pavement material(SFPM),the cement mortar was modified by rubber powder and silane coupling agent to prepare composite semi-flexible pavement material(R&S-SFPM).Based on the response surface analysis method,the splitting tensile strength,flexural tensile strength,maximum flexural tensile strain,flexural creep rate and average linear shrinkage coefficient were used as evaluation indexes to analyze the effects of rubber powder mesh,dosage and silane coupling agent dosage on the low temperature performance of SFPM,and the R & S-SFPM blending ratio that can obtain the best low temperature performance was determined.The results show that rubber powder can improve the stress relaxation ability of SFPM and make it have better flexibility.Silane coupling agent can im-prove the mechanical strength of SFPM.In addition,the content of rubber powder and silane coupling agent and the mesh number of rubber powder have a great influence on the improvement effect of SFPM low temperature performance.When the rubber powder mesh is 60 mesh,the dosage is 14％,and the dosage of silane coupling agent is 0.72％,the comprehensive low temperature effect of R & S-SFPM is the best.Compared with ordinary semi-flexible pavement material(O-SFPM),the splitting tensile strength,bending tensile strength,maximum bending tensile strain and bending creep rate of R & S-SFPM are increased by 23.7％,7.6％,29.9％and 15.2％.respectively.
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