冻融循环条件下沥青混合料的损伤规律  

Damage law of asphalt mixture under freeze-thaw cycle conditions

作　　者：程培峰[1] 王天琪 李艺铭[1] 张开元 CHENG Peifeng;WANG Tianqi;LI Yiming;ZHANG Kaiyuan(School of Civil Engineering,Northeast Forestry University,Harbin,Heilongjiang 150040,China)

机构地区：[1]东北林业大学土木工程学院,黑龙江哈尔滨150040

出　　处：《江苏大学学报（自然科学版）》2023年第2期235-241,共7页Journal of Jiangsu University：Natural Science Edition

基　　金：黑龙江省交通运输厅科技项目(43220060)。

摘　　要：为研究冻融循环作用对沥青混合料水稳定性的影响,基于表面自由能理论,分析了不同冻融循环次数下沥青-集料界面间黏附功与剥落功的变化情况,并对沥青混合料的水稳定性进行了评价;在此基础上,利用劈裂试验及Logistic模型进一步探究了沥青混合料的饱水程度与冻融作用对其水稳定性的影响.研究结果表明:随着冻融循环次数的增加,沥青的表面能及黏聚功降低,沥青-集料间的黏附功降低,剥落功升高,沥青混合料的水稳定性减弱;沥青混合料的空隙率随冻融循环次数的增加而增大,其劈裂强度降低;冻融过程中沥青混合料的饱和度越大,其损伤程度与损伤速率越大,当沥青混合料的饱和度大于50.00%时,冻融作用对沥青混合料性能的影响愈发明显,因此推荐沥青混合料的冻融劈裂试验在饱和度高于50.00%的条件下进行.To investigate the effect of freeze-thaw cycles on the moisture susceptibility of asphalt mixtures,the changes of adhesion work and exfoliated work between asphalt aggregate interface under different freeze-thaw cycles were analyzed based on the surface free energy theory,and the moisture stability of asphalt mixture was evaluated.The effects of water saturation and freeze-thaw on the water stability of asphalt mixture were further explored by splitting test and Logistic model.The results show that with the increasing of freeze-thaw times,the surface energy and cohesive work of asphalt are decreased with decreased adhesion work between asphalt and aggregate,while the exfoliated work is increased with decreased moisture susceptibility of asphalt mixture.The void fraction of asphalt mixture is increased with the increasing of freeze-thaw times,while the splitting strength is decreased.The greater the saturation of asphalt mixture during freeze-thaw is,the greater the damage degree and damage rate are.When the saturation of asphalt mixture is greater than 50.00%,the effect of freeze-thaw on the performance of asphalt mixture becomes more obvious.Therefore,it is recommended that the freeze-thaw splitting test of asphalt mixture should be carried out under the condition of saturation higher than 50.00%.

关 键 词：沥青混合料 道路工程 冻融循环 表面自由能理论 饱和度 LOGISTIC模型 

分 类 号：U414[交通运输工程—道路与铁道工程]