Study on Pavement Performance and Fracture Resistance of Basalt Fiber Asphalt Mixture
To study the effect of basalt fiber on the pavement performance and fracture resistance of asphalt mixture,the optimum asphalt-aggregate ratio with the different basalt fiber dosages is determined by using the Marshall test.On this basis,the influence law of fiber dosage on pavement performance,aging performance and fracture resistance,and its improvement effect are analyzed.The results show that the dosage of basalt fiber will affect the optimal asphalt content,and the fiber dosage should be considered simultaneously to determine the optimal asphalt-aggregate ratio.When the fiber dosage is 0.1％,the optimal improvement effect is achieved,which can maximize the high-temperature stability,low-temperature fracture resistance and water stability to 31.5％～38.4％,24.4％～37.3％,1.2％～5.5％respectively.The improvement degree of the fiber on the high-temperature stability of aging asphalt mixture is the best,especially on the dynamic stability.The improvement degree is 1.28～15.0 times of the other performances,the low-temperature fracture resistance is better secondly and the improvement effect of water stability is the weakest.The fiber can improve the crack opening displacement corresponding to the peak load by increasing the ductility of asphalt mixture.And the improvement effect of basalt fiber on the fracture resistance of asphalt mixture at medium temperature is higher than that at low temperature.The maximum fracture toughness can be improved by 21.64％.
NETL
NSTL
万方数据
