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排水性沥青混合料宏观性能与微细观空隙结构研究
作者：张秀，张丽，李书芳
（重庆工程职业技术学院，重庆 江津 402260）
摘要：基于室内试验研究了不同空隙率排水性沥青混合料的力学性能、路用性能、疲劳性能及细微观空隙形态，建立了排水性沥青混合料细微观空隙结构与其宏观路用性能之间的关系。结果表明：大孔隙开级配排水式沥青磨耗层（OGFC）混合料的劈裂强度、动态压缩模量、低温弯曲应变及各应变水平下的疲劳寿命随着空隙率增大而减小；车辙试验动稳定度与贯入剪切强度均随空隙率增大呈先增大后减小，空隙率为21.3%时，OGFC混合料的高温抗车辙性能最佳；OGFC混合料的使用性能、排水性能均与微观空隙直径有良好的相关性，推荐OGFC的目标空隙率为20%~22%。
关键词：排水性沥青混合料；疲劳性能；力学性能；细微观空隙
中图分类号：TU535 文献标识码：A 文章编号：1001-702X（2020）09-0094-05
Study on macroscopic properties and microscopic viscosity structure of drainage asphalt mixtures
ZHANG Xiu，ZHANG Li，LI Shufang
（Chongqing Engineering Vocational and Technical College，Jiangjin 402260，China）
Abstract：Based on laboratory experiments，the mechanical properties，road performance，fatigue performance，and fine and microscopic void shapes of drainage asphalt mixtures with different porosities are studied. The relationship between the fine and microscopic void structure of drainage asphalt mixtures and their macroscopic performance is established. The results show that the splitting strength，dynamic compressive modulus，low-temperature bending strain and fatigue life of Open Graded Friction Course（OGFC） mixture continue to decrease with the increase of the porosity. Both the dynamic stability and penetration shear strength of the rut test first increase then decrease with the increase of the porosity. The high-temperature rutting resistance performance of the OGFC mixture is the best at a porosity of 21.3%. The use performance and drainage performance of OGFC mixture have a good correlation with the microscopic void diameter. The recommended target void ratio of OGFC is 20%~22%.
Key words：drainage asphalt mixture，fatigue performance，mechanical properties，fine and microscopic void