Abstract
Maintaining good friction performance of highway pavement is important for road safety. The friction is affected by many factors, and the present study investigates the effect of the compactness on the texture and friction of asphalt concrete during the polishing process. Two three-dimensional (3D) texture parameters and the mean texture depth (MTD) were used to characterize the surface texture of AC-13 asphalt concrete. The differences of surface texture are then being analyzed among the pavement in the field, rutting slabs with 97% compactness (RS-97), rutting slabs with 100% compactness (RS-100), and rutting slabs with 103% (RS-103). The rutting slabs were polished by a circular vehicle simulator (CVS). The 3D surface topography, British pendulum number (BPN), and MTD were obtained during the polishing process. Test results show that the surface of the rutting slab can be smoother as the compactness increased from 97% to 103%. During the whole polishing process, the rutting slab with smaller compactness had higher value of the MTD. The impact of compactness on the BPN is insignificant during the polishing process, but rutting slabs with smaller compactness had better friction at high speed as the result of the higher MTD.
Highlights
Friction refers to the force developed in the tire-pavement interface, and it can be affected by several factors, such as the properties of the tire, the vehicle speed, the type of the aggregate, and the surface texture of the road pavement [1,2,3]
Maintaining highway pavements at good friction performance is important for road safety
Three rutting slabs with 97%, 100%, and 103% compactness were polished by the circular vehicle simulator (CVS)
Summary
Friction refers to the force developed in the tire-pavement interface, and it can be affected by several factors, such as the properties of the tire, the vehicle speed, the type of the aggregate, and the surface texture of the road pavement [1,2,3]. New asphalt pavement can provide enough friction, and the asphalt pavement will be polished due to traffic in its service life. The friction of the pavement will be deteriorated over time, which significantly increases the number of road accidents, especially under wet weather conditions [4,5]. In locations where traffic exerts a greater horizontal force, such as braking areas approaching roundabouts and junctions, or on bends and slopes, the polishing effect of traffic is amplified, and the friction coefficient tends to be lower. Maintaining highway pavements at good friction performance is important for road safety
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