Crack resistance of coal gangue powder/basalt fiber asphalt mixture at low temperature
To improve the low-temperature crack resistance of asphalt mixture,through Marshall test and semi-circular bending(SCB)test,asphalt mixture specimens containing different content of basalt fiber(0,0.2％,0.3％,0.4％,0.5％)and different proportions of coal gangue powder replacing S95 ore powder(0,25％,50％,75％,100％)were prepared,and the low-temperature crack resistance index of asphalt mixture speci-mens was evaluated by load peak and fracture energy.The results show that when the content of basalt fiber is set to 0.3％and 50％coal gangue powder is used instead of S95 ore powder,the low-temperature crack resist-ance of asphalt mixture reaches the best.Compared with the benchmark sample without any modified material,the peak load and fracture energy of SCB test blocks increased significantly at multiple low temperatures of 0,-10,-20 and-30 ℃,which were 39.88％-53.44％and 44.02％-49.84％respectively.
asphalt mixturebasalt fibercoal gangue powderSCB test
万方数据
维普
