重复荷载对沥青混凝土裂缝愈合周期的影响

萨阿 德·, 哈南 ·卡
巴格达大学工程学院土木工程系

摘要

沥青混凝土路面设计为在其设计寿命内承受重复荷载，且维护要求最低。在这种加载模式下，柔性路面结
构中出现了微裂缝，同时表现出微裂缝的自愈能力。在这项工作中，研究了反复拉伸和剪切应力对沥青混凝土永久
应变累积和微裂纹愈合循环的影响。已制备了直径为 100mm、高度为 63mm 的沥青混凝土试样，其沥青含量达到
最佳要求，并在最佳值以上和以下添加了 0.5% 的沥青。在 25° C 环境下，使用三个应力水平（69、138 和 207）
kPa，试样在反复拉伸和剪切应力下表现出永久应变。负载循环包括 0.1 秒的负载重复施加，然后是 0.9 秒的休息期。
在每 1000 次负载重复后，通过 60° C 的外部加热使试样愈合 120 分钟，然后进行另一次负载重复循环。愈合周期
重复两次。结果表明，随着裂纹愈合周期的进行，弹性模量增加，而永久应变减小。沥青含量对弹性模量的影响在
拉伸应力和剪切应力之间的裂纹愈合循环中是可变的。在裂纹愈合循环后，与冲压剪切应力（PSS）下的参考混合物
相比，永久应变分别降低了（45、36 和 23）%，分别为（69、138 和 207）kPa，而与间接拉伸应力（ITS）下的参
比混合物相比，其分别降低了平均（5、23 和 21）%。

关键词

沥青混凝土；应力水平；愈合周期，重复拉伸；重复剪切；压力

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