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多孔沥青混合料与密级配沥青混合料在组成和结构上存在区别,因此在水稳定性、抗冻、高温、疲劳特性等方面存在差异。基于汉堡浸水车辙、冻融循环、疲劳等室内试验对多孔沥青混合料PAC-13的路用性能进行系统研究。结果表明,采用了高黏度改性沥青和骨架结构的多孔沥青混合料在水、热和荷载耦合作用下的路用性能良好;其低温性能较密级配沥青混合料弱;在浸水状态下经历冻融循环后,混合料的马歇尔稳定度、劈裂强度和飞散损失等指标未出现显著衰减,抗冻性能良好;混合料的抗疲劳性能随着空隙率的增大而降低,同时应力水平变化对疲劳寿命的影响总体上也变得更敏感。
Porous asphalt mixture and dense graded asphalt mixture in the composition and structure of the difference, so the water stability, frost resistance, high temperature, fatigue characteristics and other differences. The road performance of porous asphalt mixture PAC-13 was systematically studied based on the Hamburg flooding rutting, freeze-thaw cycle and fatigue tests. The results show that the porous asphalt mixture with high viscosity modified bitumen and skeleton structure has good road performance under the coupling of water, heat and load, the asphalt mixture with a lower density property than the dense grade bitumen mixture is weak, After melting cycle, the Marshall stability, splitting strength and scattering loss of the mixture did not show any significant attenuation and good frost resistance. The fatigue resistance of the mixture decreased with the increase of porosity, and the stress level changed The impact of fatigue life is also generally more sensitive.