Performance evaluation and material optimization of Micro-surfacing based on cracking and rutting resistance

Abstract

Abstract To improve the cracking resistance and rutting resistance performance of Micro-surfacing, the conventional test, low temperature bending test and Hamburg Wheel-Track Testing (HWTT) were conducted to analyze the improvement effect of waterborne epoxy modified emulsified asphalt (WEMEA), Styrene Butadiene Styrene (SBS) modified emulsified asphalt and fiber stabilizer on Micro-surfacing performance. The influence degree and significance level of fiber type and fiber dosage on Micro-surfacing properties were discussed to optimize the material composition of fiber Micro-surfacing. The results show that the Micro-surfacing performance is improved by selecting optimum binder or the addition of fiber, and the comprehensive improvement effect of fiber is better. Compared to other materials, the fiber significantly improves the low temperature performance, and also takes into account other properties of Micro-surfacing. Moreover, the fiber type and fiber dosage both significantly influence the properties of Micro-surfacing, and the influence degree of fiber dosage is higher. The compound use of polypropylene fiber and basalt fiber can show the technical advantages of different fiber to improve the overall performance of Micro-surfacing and reduce the cost of material. Combining with the performance change and economic influence for Micro-surfacing, the optimal dosage of fiber is recommended as 0.10%–0.20% by the weight of asphalt mixture. The research results will provide some reference for the further promotion and application of fiber Micro-surfacing.