聚酯纤维沥青混凝土抗冻融损伤性能研究  

Research on Performance of Asphalt Mixture based on Polyester Fiber Content

作　　者：程庆庆 李泽 邵培柳 CHENG Qing-qing;LI Ze;SHAO Pei-liu(School of Architecture and Civil Engineering,Chongqing Metropolitan College of Science and Technology,Chongqing 402160,China;CCCC First Highway Consultants Co.Ltd.,Xi'an 710075,China)

机构地区：[1]重庆城市科技学院建筑与土木工程学院,重庆市402160 [2]中交第一公路勘察设计研究院有限公司,西安市710075

出　　处：《公路》2022年第12期82-87,共6页Highway

基　　金：重庆市教育委员会科学技术研究项目,项目编号KJQN201902504。

摘　　要：为研究聚酯纤维掺量对沥青混凝土冻融损伤劣化的影响,通过冻融循环条件下小梁弯曲试验,获得了聚酯纤维掺量分别为0、0.1%、0.2%、0.3%和0.4%的沥青混凝土极限弯拉强度和弯曲劲度模量的变化规律;建立了聚酯纤维沥青混凝土冻融受荷损伤模型,研究了不同损伤程度下的冻融疲劳寿命。结果表明:当经历某一冻融循环次数后,聚酯纤维沥青混凝土极限弯拉破坏强度随着聚酯纤维掺量的增加呈先增大后减小趋势,即在最佳聚酯纤维掺量(0.2%左右)时,沥青混凝土极限弯拉强度和弯曲劲度模量出现峰值。聚酯纤维沥青混凝土D~N曲线可划分为:第Ⅰ阶段,即加速损伤阶段,损伤度小于等于0.6;第Ⅱ阶段,即变形发展阶段,损伤度大于0.6。在相同冻融受荷损伤状态下,聚酯纤维掺量为0.2%时,试件冻融疲劳寿命最大。不同聚酯纤维掺量的沥青混凝土冻融损伤模型相关系数R2均超过0.93,因此损伤度—冻融疲劳寿命预估模型合理、可行,预测精度较高。In order to study the influence of polyester fiber content on the freeze-thaw damage and deterioration of asphalt concrete,the trabecular bending test is carried out under freeze-thaw cycle conditions,and the polyester fiber content is proposed to be 0,0.1%,0.2%,0.3% and 0.3%respectively.The 0.4% asphalt concrete ultimate flexural tensile strength and flexural stiffness modulus changes,the freeze-thaw load damage model of polyester fiber asphalt concrete is established,and the freeze-thaw fatigue life under different damage degrees is studied.The results show that after a certain number of freeze-thaw cycles,the ultimate flexural tensile strength of polyester fiber asphalt concrete increases first and then decreases with the increase of the polyester fiber content,that is,when the optimum polyester fiber content is about 0.2%,the ultimate flexural tensile strength and flexural stiffness modulus of asphalt concrete show peaks.The D-N curve of polyester fiber asphalt concrete can be divided into:the first stage(accelerated damage stage,the damage degree less than 0.6)and the second stage(deformation development stage,the damage degree greater than 0.6).Under the same freeze-thaw load damage state,when the polyester fiber content is 0.2%,the freeze-thaw fatigue life of the specimen is the largest.The correlation coefficient R2 of the freeze-thaw damage model of asphalt concrete with different polyester fiber content all exceed 0.93,the damage degree-freeze-thaw fatigue life prediction model is reasonable and feasible,and the prediction accuracy is high.

关 键 词：纤维沥青混凝土 聚酯纤维掺量 冻融循环 冻融损伤模型 损伤度 

分 类 号：TU535[建筑科学—建筑技术科学] U414.1[交通运输工程—道路与铁道工程]