Performance And Stnicture Analysis Of Basalt Fiber-reinforced Asphalt Pavement

In order to adapt to the rapid growth of traffic volume especially the overloading vehicles, it put forward higher request to asphalt pavement. Basalt fiber-reinforced asphalt concrete pavement is more and more widespread concern with its outstanding performance. Based on the current research at home and abroad, this paper studies the pavement performance of basalt fiber reinforced asphalt mixture with laboratory experiment method and analyses the dynamic mechanical response of basalt fiber-reinforced asphalt pavement with numerical simulation method. This thesis mainly research from several aspects as follow.Firstly, Laboratory tests were conducted on asphalt mixture with basalt fiber dosage of0.3%which confirmed the asphalt-aggregate ratio. A series of laboratory experiments were progressed to analysis the effects in adding basalt fiber, such as the test of the Marshall Inundation test, wheel tracking test and the indirect tensile test. The test results show that basalt fiber dosage of0.3%can improve the water stability, high temperature stability and low temperature cracking resistance performance of asphalt mixture.Secondly, the deflection-time curves of AC-13C asphalt mixture were obtained through the bending creep test based on the viscoelastic properties of asphalt mixture. Utilize the general Maxwell model to fit viscoelastic parameters of asphalt mixture. The rutting test was simulated using ABAQUS finite element and the result had a good consistency with the experimental result which showed the rationality of the fitting parameters.Thirdly, a semi-rigid base asphalt pavement finite element model with basalt fiber-reinforced asphalt upper layer was established according to the viscoelastic parameters. The viscoelastic response of asphalt pavement was investigated under cyclic loading. The dynamic response of basalt fiber-reinforced pavement under vertical moving load and horizontal moving load was analyzed by using the user subroutines. It provides the guidance for structural design of basalt fiber-reinforced asphalt pavement. The results show that the rutting of asphalt pavement increased with the increase of overloading degree. The horizontal stress and shear stress of asphalt pavement structure layer showed tension-compression alternating change under moving load, which was the main reason of pavement fatigue failure. Besides, the horizontal moving load had a significant impact on shear stress of asphalt layer.