Study of long-term skid and wear resistance of waterborne epoxy resin-SBR compound modified emulsified asphalt microsurfacing

As an eco-friendly technology for pavement preventive maintenance, microsurfacing (MS) has the potential properties of cost-saving and excellent performance benefits in repairing distress. MS also improves the surface function, especially skid resistance, of old pavements that have gradually decayed under the coupled effects of long-term environment and loads. Reasonable assessments of the long-term skid and wear resistance of the MS can provide support for accurate decision-making on preventive maintenance, which in turn reduces maintenance costs and saves maintenance costs, and ensures traffic safety. To evaluate the long-term skid and wear resistance of MS in different natural and traffic environments, this paper investigated the change of British pendulum number (BPN), rutting depth, and mass loss rate of waterborne epoxy resin-SBR compound emulsified asphalt micro-surfacing (WER-SBR MEAMS) under different environmental factors and traffic conditions based on the self-developed accelerated loading abrasion instrument. The factors considered in the experiment include temperature, rainfall, UV radiation, speed, and load. The results showed that temperature and vehicle speed had a detrimental effect on the durability of WER-SBR MEAMS, which was more pronounced after 10,000 wear loading cycles. Reducing immersion time and slowing down the aging rate can improve the durability of WER-SBR MEAMS. Further, the influence degrees of different factors on the skid and wear resistance of MS were evaluated using the gray correlation method. From the results of the gray correlation analysis, the correlation coefficients between external variables and BPN, rutting depth, and mass loss rate are all greater than 0.8, which indicate that all the variables involved have relatively obvious and regular effects on the skid and wear resistance of WER-SBR MEAMS.