水性环氧树脂改性乳化沥青混合料性能

为了解决现有冷拌冷铺沥青混合料性能不足的问题,研究了水性环氧树脂改性乳化沥青混合料的性能.采用先乳化后改性的方法制备了水性环氧树脂改性乳化沥青,利用击实试验和马歇尔设计方法确定了混合料的最佳外掺水量和最佳乳化沥青用量,对比分析了其击实和养生方式,并利用车辙试验、低温弯曲破坏试验、浸水马歇尔试验、疲劳试验等分别评价了其高温性能、低温性能、水稳定性能和疲劳性能.试验结果表明:采用第一次击实50次、110℃养生24 h、第二次击实25次、室温静置24 h的最佳击实和养生方式,可使水性环氧树脂改性乳化沥青混合料的密度、空隙率、水分挥发量和稳定度达到最优.同时,与热拌沥青混合料性能相比,水性环氧树脂改性乳化沥青混合料的高温性能优越,低温性能和疲劳性能不足,水稳定性能基本保持一致.

Evaluation on Performances of Modified Emulsified Mixture With Waterborne Epoxy Resin

In order to improve the performance of cold and mix asphalt mixture, a new modified emulsified mixture with waterborne epoxy resin was developed. The waterborne epoxy modified emulsified asphalt binder was prepared by the method of pre emulsification and modification. A compaction test was conducted and Marshall method was used to design the optimum water content and modified emulsified asphalt content. The different compaction and curing styles were compared. High-temperature rutting test,low-temperature bending test,immersion Marshall test and fatigue test were conducted to estimate its high-and-low temperature performance, water sensitivity and fatigue performance. The test results show that the best compaction and curing style is compacting sample 50 times at the first time,putting sample at 110℃ oven for 24 hours,compacting sample 25 times for the second time,and putting sample in air for 24 hours; compared with the performances of hot mix asphalt, the high-temperature performance of modified emulsified mixture with waterborne epoxy resin is significantly increased, but the low-temperature and fatigue performance are lower,and the water sensitivity is almost the same.