Curing Law and Road Performance of Polyurethane Mixture
Polyurethane mixture is composed of polyurethane binder,rubber particles,and stones.Compared with ordinary asphalt mixture,it has the characteristics of a higher content of rubber particles and large void ratios.This article first tested the viscosity-time curve and viscosity-temperature curve of one-component polyurethane and determined the compaction temperature of the polyurethane mixture.Based on the rutting test,three-point bending test,water immersion Marshall test,freeze-thaw splitting test,and pendulum friction test,the road performance of the polyurethane mixture under different replacement amounts of rubber particles was tested.The research results show that the mixing temperature of PU-1 polyurethane mixture can be basically controlled between 73℃and 81℃,and it can be spread and rolled at room temperature(25℃);the polyurethane mixture is cured after four days at room temperature.To accelerate the curing,the water spraying method can be used;under the condition of ensuring high temperature performance,when the replacement amount of rubber particles continues to increase,the maximum flexural strain,RMSR value,RTSR value,and BBPN value of the polyurethane mixture increase linearly.It shows that the rubber particles can promote low temperature performance,water stability,and slip resistance of the polyurethane mixture.
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