Study on Application of Rubber Powder Composite Modified Asphalt in Thin Overlay Asphalt Mixture
The high-grade highways built in the early days in China have generally entered the maintenance stage,thin overlay is a common maintenance method of asphalt pavement,and modified asphalt is the key material in thin overlay as-phalt mixture.By preparing rubber powder and SBS(styrene butadiene styrene block copolymer)composite modifier,and then adding rubber powder,the rubber powder composite modified asphalt was prepared and applied to thin overlay asphalt mix-ture.Study the influence of rubber powder amount and curing time on the three indexes(softening point,penetration,ductility)and viscosity of rubber powder composite modified asphalt,and on the high temperature performance,low temperature performance and water stability of thin overlay asphalt mixture.The results show that the increase of rubber powder amount is beneficial to improve the viscosity of the composite modified asphalt and the road performance of thin overlay asphalt mixture,too long curing time has an adverse impact on the performance of rubber powder composite modified asphalt.Based on the compos-ite modified asphalt index and the performance of thin overlay asphalt mixture,it is recommended that the appropriate amount of rubber powder for thin overlay is 15％,and the curing time is 4 h.
万方数据
维普
