硫磺改性沥青混合料基本性能的研究

为考察硫磺改性沥青混合料的路用性能，选取AC-13和AC-20两种混合料类型、4种不同的硫磺掺量（硫磺占硫磺改性沥青胶结料的质量百分比分别为0%、30%、35%、40%）作为对比，采用浸水马歇尔试验、冻融劈裂试验、汉堡车辙试验测试了其水稳定性能，采用车辙试验、三点小梁弯曲试验和Overlay Tester试验分别测试了其高温性能、低温性能与疲劳性能，采用动态模量试验获得了其力学参数. 结果表明: 添加质量分数为30%硫磺后，AC-13和AC-20沥青混合料动稳定度分别提高了18%和26%，疲劳开裂性能有所提高， 低温性能没有明显改变. 添加不同质量分数的硫磺，沥青混合料的水稳定性能明显降低，其中AC-13沥青混合料在添加40%硫磺时冻融劈裂强度比下降达22%. 动态模量测试表明硫磺改性沥青混合料与普通沥青混合料动态模量变化趋势相同，但-10 ℃~54 ℃温度区间较普通沥青混合料动态模量要高.

Basic Performance of Sulfur-Modified Asphalt Mixture

The sulfurs with mass fraction of 0%， 30%， 35% and 40% were respectively added into two types of asphalt mixtures （AC-13 and AC-20）， and the properties of sulfur-modified asphalt mixture in pavement were explored. The moisture resistance of sulfur-modified asphalt mixture was measured by immersion Marshall test， freeze-thaw splitting test and Hamburg rutting test， and the high temperature performance， low temperature performance and fracture?resistance were evaluated by Rutting test， three-point bending beam test and Overlay Tester， respectively. Besides， the mechanistic properties were obtained by the dynamic modulus test. The results show that the dynamic stability values of asphalt mixtures AC-13 and AC-20 with sulfur mass fraction of 30% increase respectively by 18% and 26%， and their bending tensile strengths also enhance， but their low temperature performances do not change. The moisture resistance of asphalt mixture reduces significantly after adding different mass fraction of sulfur， the tensile strength ratio of sulfur modified asphalt mixtures AC-13 decreases by 22% with adding sulfur mass fraction of 40%. Dynamic module test indicates that the variation tendency was similar between the sulfur modified asphalt mixture and the conventional asphalt mixture， however， the dynamic modulus values of sulfur-modified asphalt mixture are higher in a temperature range of -10 ℃ to 54 ℃ .