排水性沥青混合料热老化性能  

Study on thermal aging properties of porous asphalt mixture

作　　者：李振霞[1] 陈渊召[1,2,3] 孙克成[1] 

机构地区：[1]华北水利水电大学土木与交通学院,河南郑州450011 [2]郑州大学水利与环境学院,河南郑州450001 [3]华北水利水电大学生态高性能建筑材料河南省高校重点实验室培育基地,河南郑州450011

出　　处：《长安大学学报（自然科学版）》2014年第3期41-46,共6页Journal of Chang’an University(Natural Science Edition)

基　　金：交通运输部西部交通建设科技项目(2005 318 812 13);华北水利水电大学高层次人才科研启动费资助项目(200929);河南省教育厅科学技术研究重点项目(13A580707;13B580109;14A580002)

摘　　要：为了研究排水性沥青混合料的热老化性能,首先研究了沥青混合料的热老化机理,然后通过对比分析确定了排水性沥青混合料的短期和长期热老化试验方法,最后对3种不同空隙率的排水性沥青混合料,分别研究了热老化对其高温稳定性、低温抗变形能力和抗水损害性能的影响规律。研究结果表明:热老化使结合料变脆,劲度模量变大,沥青混合料的动稳定度变大;相同热老化时间,随空隙率的增大,动稳定度增大,空隙率高的排水性沥青混合料低温抗弯拉破坏和抗收缩应力的能力越低;在同一空隙率下,排水性沥青混合料的最大弯拉强度和最大弯拉应变在老化后均减小;经过热老化处理后,排水性沥青混合料的抗水损害性能有所提高;在热老化时间相同条件下,空隙率越大,其抗水损害的能力就越差。In order to study the thermal aging properties of porous asphalt mixture,thermal aging mechanism of porous asphalt mixture was studied firstly.Then,short-term and long-term thermal aging test methods for porous asphalt mixture were determined through comparative analysis.Finally,systematic study on influence laws of thermal aging on three porous asphalt mixtures of different porosities was carried out respectively.The results show that because of thermal aging,asphalt becomes brittle,stiffness modulus of asphalt becomes big and the dynamic stability of porous asphalt mixture becomes big.Under the condition of the same thermal aging time,the dynamic stability increases with the increase of porosity and the abilities of low temperature antibending tensile failure and anti-shrinkage stress of porous asphalt mixture with higher porosity is worse.Under the condition of the same porosity,the maximum flexural tensile strength andmaximum flexure tensile strain of porous asphalt mixture all decrease after thermal aging.After thermal aging,the anti-water damage property of porous asphalt mixture will increase.Under the condition of the same thermal aging time,the anti-water damage property of porous asphalt mixture will be worse with the increase of porosity.

关 键 词：道路工程 热老化性能 排水性沥青混合料 热老化机理 

分 类 号：U416.1[交通运输工程—道路与铁道工程]