Evaluation of the influence of gradation and type of the aggregate and type of polymer resin on polishing and skid resistance performance of high friction surfaces

Increasing surface friction has always been one of the major concerns of the world in recent decade in increasing safety and reducing road accidents. The frictional resistance of the tire to the surface of the pavement depends on two main factors: the technical characteristics of the tire and the frictional properties of the pavement. The most important factors contributing to surface friction are the fine and coarse texture. The first factor causes frictional resistance at low speed and the second factor at high speed. High friction surface technology, which uses a thin layer of polymer resin to place high friction aggregates on the pavement, is an effective way to increase asphalt pavement surface friction. In this study, the frictional number changes of asphalt samples coated with different types of high friction layers were investigated using the English Pendulum. The studied samples included fifteen types of aggregates in three different aggregates and two types of polymer resins. Subsequently, the specimens were placed in a polished accelerator and their polished resistance was evaluated again and the friction number and kinetic friction coefficient of each were determined. Results showed that among the paired compounds for type one aggregation, calcined bauxite and dolomite with skid number 108 for dry state and for type two aggregation, granite and silica with skid number 99, for dry state as well as for type three aggregation, calcined bauxite and silica with skid number 95 for dry state, and also among the pure compounds used in the high friction pavement, calcined bauxite with skid numbers of 111, 107, 105 respectively, had the highest frictional values for drying of the first to third types. It was also found that the average frictional values of the triple aggregates of the samples containing epoxy resin in the dry and wet state were approximately 15% and 13% higher than the similar samples containing the polyester resin, respectively. Surface containing calcined bauxite had the best initial friction performance and after polishing and dolomites and granite samples had the weakest results, respectively.