Research on Composition Design and Performance of Ultra-thin Wear Layer of Asphalt Pavement
Steel slag and basalt are used to prepare two kinds of graded thin-layer overlay,and the effects of different aggregate types and grading types on the water stability,anti-sliding,interlaminar shear and flexural-tensile properties of thin-layer overlay were explored.The results show that the ad-dition of steel slag improves the water damage resistance,sliding resistance and bending strength of the thin-layer cover.High alkalinity helps to form a stronger interface strength with asphalt,making it less susceptible to moisture erosion.The mixture type with SMA discontinuous gradation has better water damage resistance.The influence of aggregate type on the test results of interlaminar shear strength is weak,but it is significantly influenced by gradation type.The surface of AC10 material is smoother,and it can be better bonded with the base material under the action of adhesive layer oil.The rich angular features of steel slag contribute to the formation of more aggregate contact points in the thin-layer covering material,so as to obtain a more stable internal structure.However,the dense skeleton structure formed by the contact of coarse aggregates in SMA intermittent gradation can resist external loads more effectively than the suspended dense structure of AC10.
万方数据
维普
