浇注式沥青混合料疲劳特性研究.pdfVIP

学兔兔 第14卷第3期 建 筑 材 料 学 报 Vo1．14，No．3 2011年 6月 JOURNAL OF BUILDING MATERIALS 、Jun．．2011 文章编号：1007—9629(2011)03—0335—06 浇注式沥青混合料疲劳特性研究 张 华 ， 钱觉时 ， 吴文军 ， 郝增恒 (1．重庆大学材料科学与工程学院，重庆400045；2．重庆市智翔铺道技术工程有限公司，重庆400060) 摘要：根据四点弯曲疲劳试验曲线特征，将浇注式沥青(GA)混合料劲度模量随加载循环次数的累 积过程分为3个阶段，并将宏观力学性能发生剧烈变化的第3阶段定义为沥青混合料疲劳裂缝出 现区域．试验研究了应变水平、沥青用量和试验温度与沥青混合料劲度模量和疲劳寿命的关系，结 果显示：第1阶段GA混合料劲度模量衰变至初始劲度模量的80 左右，占总疲劳寿命的5 ～ 1O ；第2阶段劲度模量衰变较为缓慢，与加载次数呈线性关系，占总疲劳寿命的7O ～85％；第3 阶段占总疲劳寿命的5 9／6～10 ．较高应变水平下GA混合料也有非常好的疲劳耐久性；增大沥青 用量不能显著提高GA混合料的疲劳寿命；GA混合料疲劳寿命对温度非常敏感，且随着温度的升 高而增加． 关键词：浇注式沥青(GA)混合料；劲度模量；应变水平；沥青含量；温度 中图分类号：TU528．42 文献标志码：A doi：10．3969／j．issn．1007—9629．2011．03．009 Research on Fatigue Performance of Gussasphalt Mixture ZHANG Hua ， QIAN Jue～shi ， WU Wen-jun ， HAO Zeng—heng (1．College of Materials Science and Engineering，Chongqing University，Chongqing 400045，China； 2．Chongqing Zhixiang Paving Technology Engineering Co．，Ltd．，Chongqing 400060，China) Abstract：Through four—point fatigue bending test，the cumulation process of gussasphah(GA)mixture stiffness modulus with load cycles was divided into three stages，and the third stage when the macro me— chanical performances were greatly changed was defined as fatigue crack appearance stage of GA mixture． The respective relations among strain level，asphalt content，test temperature and stiffness modulus as well as fatigue life were researched in the experiment．The results show that：the first stage when the specimen exhibits an 80 reduction in stiffness modulus relative to the initial stiffness accounts for 5 9／6— 1 0 of total fatigue life；the second stage during which the reduction becomes slowly and