就地热再生沥青混合料水稳定性评价方法分析
Analysis on Evaluation Method of Water Stability of in Reclaimed Asphalt Mixer

文章首先分析了就地热再生沥青混合料的沥青–集料粘附性特点和施工常见问题，通过水稳定性试验验证了就地热再生技术可以大幅提高水稳定性，但是需要更严格的试验环境模拟其长期水稳定性能。其次，比较分析了浸水马歇尔试验、真空饱水马歇尔试验、冻融劈裂试验和浸水劈裂试验三种常见的水稳定性评价方法应用于就地热再生沥青混合料的适用性，试验结果表明：浸水马歇尔试验不适于评价就地热再生沥青混合料水稳定性，而冻融劈裂试验和浸水劈裂试验机理与水损害直接相关、试验模拟条件较为严格、试验结果的区分度较好、与空隙率的相关度较好，适于就地热再生沥青混合料水稳定性评价；若改进冻融劈裂试验和浸水劈裂试验，加入动水压力环境，模拟实际路况中路面受到的温度、压力、水的耦合作用，将使其评价效果更佳准确。
This paper first analyzes the characteristics of asphalt-aggregate adhesion and common problems in construction of local hot recycled asphalt mixture. Through water stability test, it is verified that local heat regeneration technology can greatly improve water stability. However, more stringent test environment is needed to simulate its long-term water stability. Secondly, the applicability of three common water stability evaluation methods: immersion Marshall test, vacuum saturated Marshall test, freeze-thaw splitting test and immersion splitting test are compared and analyzed. The results show that the immersion Marshall test is not suitable for evaluating the water stability of geothermal recycled asphalt mixture, while the mechanism of freeze-thaw splitting test and immersion splitting test is directly related to water damage, the test simulation conditions are strict, the test results are well distinguished, and the correlation with porosity is good, and the water stability evaluation of hot recycled asphalt mixture is suitable; If the freeze-thaw splitting test and the immersion splitting test are improved, the dynamic water pressure environment is added to simulate the coupling effect of temperature, pressure and water on the road surface in the actual road condition, the evaluation effect will be better and more accurate.