Effect of Large Amount of Rubber Powder on Low Temperature Performance of Stone Mastic Asphalt
In order to improve the recycling rate of waste tires,the tires were crushed and processed into rubber powder,limestone aggregates were replaced by the iso-volumetric method,and the grading design of the rubber powder was optimized,and the stone mastic asphalt(SMA)were prepared with a polyester fiber dosing of 0.4％and different replacement rates of the rubber powder(0,1.5％,2.0％,2.5％,3.0％,3.5％,and 4.0％).Based on the Marshall stability test and semi-circular bending test(SCB),the effects of rubber powder on the cracking resistance of SMA-13 asphalt mixtures at different low temperatures were comprehensively analyzed using the ultimate tensile stress,fracture energy,fracture toughness,and fracture stiffness of SCB specimens.The results show that the optimum asphalt dosage of SMA-13 asphalt mixture is directly proportional to the dosage of rubber powder,and the increase in the dosage of rubber powder improves the elastic properties of the mixture.Compared with limestone asphalt mixtures,rubber powder asphalt mixtures have more stable and excellent crack resistance.When the replacement rate of rubber powder is 3％,SMA-13 asphalt mixture has the strongest resistance to deformation,which can significantly improve its low-temperature performance,providing a theoretical basis for the design of asphalt pavement material composition.
rubber powdersemi-circular bending testoptimum amount of asphaltlow temperature performance
万方数据
维普
