Influence of mineral aggregate on asphalt pavement surface properties

Abstract

The road surface roughness is one of the factors influencing road safety. Therefore, the choice of materials and mixtures for the wearing course of pavement is important. The paper presents the results of research on the influence of the composition of asphalt mixtures on the surface parameters of PTV and MTD, which were analyzed according to the type of mixture, type of aggregate, and maximum aggregate size on laboratory-produced samples and samples with bitumen stripped surfaces. The skid resistance of SMA 11 and AC 16 mixtures were higher (PTV value 64.2 and 66.2) compared to AC11 and AC8 mixtures (PTV value 56.8 and 58.6) with all tested aggregates. After bitumen stripping from the surface, the PTV values of mixtures increased and the influence of the aggregate type and texture became more significant. To achieve better skid resistance properties, it is suitable to use coarse aggregate from andesite or granodiorite rocks (PTV value 67.0 or 65.8). Of the tested aggregates, limestone had the worst results (PTV value 63.3). Above all the portion of coarse aggregates, size distribution, and shape characteristics as shape index, angularity, determine the macrotexture of the surface.