高粘SBS改性乳化沥青就地冷再生混合料抗裂性能评价

Evaluation of Crack Resistance for High Viscosity SBS Modified Emulsified Asphalt Cold In-place Recycling Mixture

乳化沥青就地冷再生技术是显著地降低道路维养过程中的碳排放的理想技术方案。针对就地冷再生的技术需求及痛点,本工作实现了再生沥青混合料(RAP)的100%利用,以最佳油膜厚度来控制乳化沥青用量。同时,针对冷再生路面常见的疲劳开裂与低温开裂病害,选取了低温弯曲试验、冲击韧性试验、半圆弯曲试验、四点弯曲疲劳试验,测试分析对比高粘SBS改性乳化沥青与常规SBS改性乳化沥青两种胶结料的冷再生混合料的抗裂性能。各试验结果相符,与常规SBS改性乳化沥青相比,高粘SBS改性乳化沥青冷再生混合料表现出更好的韧性和抵抗开裂的能力。

Cold in-place recycling technology of emulsified asphalt is an ideal technical scheme to significantly reduce carbon emission in the process of road maintenance. According to the technical requirements and challeges of in-situ cold regeneration, this work realizes the 100% utilization of RAP and controls the amount of the emulsified asphalt with the best oil film thickness. Aiming at the common fatigue cracking and low-temperature cracking diseases of cold recycled pavement, low-temperature bending test, impact toughness test, semicircular bending test and four-point bending fatigue test were selected to test, analyze and compare the crack resistance of cold recycled mixture of the high viscosity SBS modified emulsified asphalt and the conventional SBS modified emulsified asphalt. The performance of each test result is consistent. In contrast to the conventional SBS modified emulsified asphalt, the cold recycled mixture of the high viscosity SBS modified emulsified asphalt shows better toughness and cracking resistance.