盐冻循环对SBS改性沥青混合料低温弯曲蠕变性能的影响  

The Effects that Salt Freezing Cycles Have on Bending Creep Properties of SBS Modified Asphalt Mixture at Low Temperature

作　　者：崔亚楠[1] 陈东升 李震[1,2] CUI Yanan;CHEN Dongsheng;LI Zhen(College of Civil Engineering,Inner Mongolia University of Technology,Huhehot,Inner Mongolia 010051,China;Inner Mongolia Civil Aviation Airport Group Co.,Ltd.,Baotou Branch,Baotou,Inner Mongolia 014040,China)

机构地区：[1]内蒙古工业大学土木工程学院,内蒙古呼和浩特010051 [2]内蒙古民航机场集团有限责任公司包头分公司,内蒙古包头014040

出　　处：《公路工程》2018年第5期48-52,共5页Highway Engineering

基　　金：国家自然科学基金(11162010);内蒙古自治区自然科学基金项目(2017MS(LH)0102)

摘　　要：在室内盐冻循环基础上,通过低温小梁弯曲蠕变试验分析了不同盐冻环境对沥青混合料低温弯曲蠕变性能的影响;同时采用灰色关联熵分析法对不同盐冻环境下小梁弯曲蠕变差异进行比较;引入扫描电子显微镜从微观层面分析冻融前后混合料试样的微观结构变化。通过宏微观相结合的手段发现:低温下沥青混合料变形性能受冻融循环影响显著,其中破坏程度以水冻融最为严重。盐冻循环各组对于沥青混合料的破坏程度由于受多个因素影响各有差异但在冰冻温度为-20℃、盐溶液浓度为4%和冻融循环次数为15次环境下沥青混合料的低温变形能力相对较好。Basedon the freeze-thaw cycletest of laboratory,the trabecular bending creep test was conductedin this article to analyse the influence that salt freeze-thaw cycles had on bending creep properties of SBS(styrene-butadiene-styrene block copolymer)modified asphalt mixture at low temperature.At the same time,the analysis of grey entropy was used to compare the trabecular bending creep differencesunder different salt freezing conditions.Scanning electron microscopy(SEM)was also used to study the microstructure of asphalt mixture specimensbefore and after freeze-thaw cycles.Through the combination of macro and micro methods,it is observed thatthe effect of freeze-thaw cycles on the low temperature deformation performance of asphalt mixture is remarkable and the failure degree is most serious with water freeze and thaw.The failure degree that different freeze-thaw cycles environments have on asphalt mixture varies in multiple factors.When the freezing temperature is at-20 degree,the concentration of salt solution is 4%and the number of freeze-thaw cycles is 15 times,the low temperature deformation ability of asphalt mixture is relatively good.

关 键 词：蠕变 盐冻循环 灰色关联熵分析法 扫描电子显微镜 

分 类 号：U414[交通运输工程—道路与铁道工程]