Effect of Different Fibers on Pavement Performance of Asphalt Concrete
This study compares and analyzes the effects of different dosages of basalt fiber and lignin fiber on the pavement performance of asphalt concrete,mainly involving high temperature performance,low temperature perform-ance,and water stability.Results indicate that both types of fibers can significantly improve the main pavement per-formance of asphalt concrete,but the fiber dosage needs to be reasonably controlled.When the dosage of lignin fiber is 0.3%and the dosage of basalt fiber is 0.4%,the high-temperature performance and low-temperature performance of asphalt concrete reach the best:the dynamic stability is improved by 53.4%and 73.1%,respectively,and the low-tem-perature bending and tensile strain increased by 20.3%and 11.9%,respectively.When the fiber dosage does not exceed 0.4%,the water stability of asphalt concrete is continuously improved.Considering the pavement performance and eco-nomic cost of fiber-reinforced asphalt concrete,when focusing on the high-temperature performance,it is recommended to use basalt fiber and maintain its dosage at 0.4%.When focusing on the low-temperature performance and water sta-bility,it is recommended to use lignin fibers and maintain its dosage at 0.3%.
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