高原寒冷地区温拌沥青混合料水稳性能分析

Study of the water stability of warm mix asphalt mixture in cold plateaus

为探讨高原寒冷地区温拌沥青混合料的水稳定性及性能衰变规律，采用多次冻融循环室内试验模拟混合料所处环境温差大、冻融频繁、气温低等特性，选取Aspha-min、Sasobit、Evotherm等不同类型温拌剂拌制混合料，通过冻融劈裂试验、冻融飞散试验等，分析热拌与温拌沥青混合料的水稳性能及其衰变趋势，定量说明频繁的冻融循环对其性能的影响。结果表明：气候因素长期作用下，热拌沥青混合料的水稳性能优于温拌沥青混合料；随着冻融循环次数的增加，混合料的水稳性能均逐渐下降，15~18次冻融循环后，水稳性能趋于稳定，建议在高寒地区选取15次冻融循环作用次数作为沥青混合料水稳性能评价的试验条件；在选取的3种温拌沥青混合料中，Aspha-min温拌沥青混合料的水稳性能最差。

In order to investigate the water stability and performance deterioration of warm mix asphalt （WMA） mixture in cold plateaus, the WMA mixture with Aspha-min, Sasobit and Evotherm were selected to do freezing-thawing split test and scattering loss test. The differences of water stability for hot mix asphalt （HMA） and WMA mixture were compared. Finally, the impact of freezing-thawing cycles was quantitatively evaluated. The results show that the water stability of HMA is better than that of WMA mixture under the long-term impact of climate factors; the performance of WMA mixture decreases with freezing-thawing cycles, the water stability of WMA mixture remains stable after 15~18 freezing-thawing cycles, so 15 freezing-thawing cycles is taken as test criterion of performance evaluation for asphalt mixture in cold plateaus. The water stability of WMA mixture with Aspha-min is worst among all selected mixtures.