Investigation on anti-skid performance of asphalt mixture composed of calcined bauxite and limestone aggregate

In order to effectively improve the anti-skid performance of asphalt pavement, 88# calcined bauxite was introduced as a kind of high anti-skid aggregate, and the principle of differential polish was applied. With the self-developed three-wheel polishing device (TWPD), dynamic friction coefficient tester (DFT), accelerated stone polishing tester and AMES road laser texture scanner, the polishing performance and distribution maps of mean profile depth (MPD) of limestone and 88# calcined bauxite were obtained. The anti-skid performance of asphalt mixture blended with high and low polished stone value (PSV) aggregates was investigated. Before and after polishing, the MPD and estimated texture depth (ETD) of asphalt mixture blended with different proportions of 88# calcined bauxite were analyzed. The results show that the PSV of 88# calcined bauxite is significantly better than that of limestone. Based on different polished times, the relationship model between dynamic friction coefficient (DF) and vehicle speed was established. The model can reflect the relationship between friction coefficient, polishing times and vehicle speed well. Meanwhile, the reasonable proportion of 88# calcined bauxite is 25%similar to 50% mass of the mineral aggregate in asphalt mixture. The surface of asphalt mixture appeared obviously differential polishing effect, and the anti-skid performance of asphalt pavement was significantly improved. The obtained MPD and ETD values and the distribution maps of MPD were used to demonstrate the proposed optimal scheme. The research results provide new ideas for improving durability and anti-skid performance for asphalt pavement.

Automated summary

In this study, 88# calcined bauxite was introduced as a high anti-skid aggregate to improve the anti-skid performance of asphalt pavement using the principle of differential polish. The results showed a significant improvement in the anti-skid performance of asphalt mixture blended with different proportions of 88# calcined bauxite, with the optimal proportion being 25% to 50%. The study provides new ideas for enhancing durability and anti-skid performance of asphalt pavement.