Performance Characteristics of Cold-Mixed Porous Friction Course with Composite-Modified Emulsified Asphalt

Abstract

A cold-mixed porous friction course (PFC) with waterborne epoxy resin/polyurethane composite-modified emulsified asphalt was prepared to improve the skid resistance and durability of pavement in hot and rainy areas. The technical parameters of the different structural layers of the cold-mixed PFC were determined. The high-temperature performance, abrasion resistance, water stability, and permeability of the cold-mixed PFC wear layer were investigated systematically. The skid resistance of the cold-mixed PFC wear layer, microsurfacing, and chip seal under different rainfall conditions was compared, and the open traffic time of cold-mixed PFC construction was analyzed. The results showed that the wear layer of cold-mixed PFC exhibited excellent high-temperature performance, abrasion resistance, water stability, and permeability. The skid resistance of the cold-mixed PFC wear layer was less affected by rainfall. When the rainfall intensity was 35 mL/s/m2, the British pendulum number (BPN) values of the wear layer of cold-mixed PFC-5 and PFC-8 were 66 and 73 BPN, respectively. The early strength of the different structural layers of cold-mixed PFC forms quickly, which can ensure the rapid opening of traffic after construction.