Abstract:The ultra-thin wear layer technology has low cost and fast construction, which can meet the individual needs of road maintenance, but its road performance still needs to be further verified. In this paper, three modified asphalt cementing materials are selected. On this basis, three gradation types of OGFC, SMA and NovaChip are selected as the typical open gradation, discontinuous gradation and semi-open gradation options; for the above three gradations After completing the gradation design, the best oil-stone ratios of different modified asphalts were determined; related standard test pieces were formed, and the road performance of 9 groups of test pieces were tested and analyzed. The test results show that with the increase of the viscosity of the modified asphalt, the high temperature stability of SMA is positively correlated with the increase of the viscosity of the modified asphalt, while NovaChip is negatively correlated; the low temperature stability of OGFC and NovaChip shows a linear increase trend; The water stability of the mixture is positively correlated; the anti-skid performance of the mixtures at all levels increases first and then decreases, and the SBS modified asphalt has the best anti-skid performance. The research results of this paper can provide a certain reference for the popularization and application of modified asphalt ultra-thin wear layer.
