Experimental Investigation On Performance Of Basalt Fiber-Reinforced Pavement Materials

The asphalt pavement has been widely used in express highway for its merits of smooth, comfortable travel, low-noise and so on. However, early damage of asphalt pavement becomes more and more serious with the continued increasing of axle load and traffic; therefore, the pavement performance of asphalt mixture should be reinforced in some way to meet the need of traffic development. But how to effectively improve the asphalt pavement performance and then to improve the service quality and life of the asphalt pavement has been become the research emphasis of a great deal of road researchers. Fiber as a kind of new asphalt mixture additive and stabilizer has caused the scholars'attention and research in domestic and foreign because of their excellent performance, simple construction and economic cost. The basalt fiber which appears after the lignin fiber and polymer fiber, as a kind of new asphalt mixture addition fiber, has received people's universal attention by its fine technical performance. Basalt fiber not only makes up for the drawback of low strength, elastic ratio and weak high temperature resistance of organic fibers, but also overcomes the drawback of environmental pollution of mineral fibers such as asbestos fiber.Based on available research findings of domestic and foreign, the optimum dosage of asphalt and fiber was firstly defined by Marshall test and rutting test in this paper. Then the pavement performance of basalt fiber asphalt mixture was studied by tests of high temperature stability test, water stability test and low temperature crack resistance test, moreover compared and evaluated with the pavement performance of polyester fiber, lignin fiber and control asphalt mixture. Aiming to severe cracking phenomenon of semi-rigid base and subbase in our country, the basalt fiber's reinforced effects for semi-rigid base and subbase material pavement performance was studied in this paper. The major works of this paper can be obtained as follows:(1) Research of fiber asphalt mixture Marshall testThe different type, length, fineness and dosage of the fiber in asphalt mixture were studied by Marshall test, the influence factors of fiber to asphalt mixture Marshall test results were analyzed, then the variety laws of the fibrer asphalt mixture Marshall indexes was obtained, the best bitumen-aggregate ratio of asphalt and the best dosage of fiber were all decided..(2) Pavement performance test research of fiber-reinforced asphalt mixture Based on the Marshall test and rutting test, the best dosage of fiber and asphalt was identified. The pavement performances were analyzed and compared for control asphalt mixture, polyester fiber-reinforced asphalt, lignin fiber-reinforced asphalt mixture and basalt fiber-reinforced asphalt mixture by high temperature stability test, water stability test and low temperature crack resistance test. The results show that the pavement performance of fiber-reinforced asphalt mixture was improved significantly compared with that control asphalt mixture. Under the state of the optimal dosage of fiber, the reinforced effects of basalt fiber for asphalt mixture is better than that of polyester fiber and lignin fiber.(3) The pavement performance test of basalt fiber reinforced-cement stable crushed stone (base and subbase) materialIn order to study the pavement performance of basalt fiber-reinforced cement stable crushed stone, the compressive strength test, flexural strength and toughness test,fatigue characteristic test and cracking resistance (including shrinkage cracking and temperature cycling cracking) were done for different fiber dosage and various graded cement stable crushed stone material.(4) The life prediction of basalt fiber-reinforced semi-rigid AC pavementTo verify the reinforced effect of the basalt fiber to semi-rigid asphalt concrete pavement using life, the fatigue life prediction for semi-rigid AC pavement which surface incorporated with baslt fiber was done, what's more, the predition results was compared to the ordinary semi-rigid asphalt pavement.