Dynamic creep test was conducted on unmodified and fiber modified samples, using UTM-25 machine. During this work, it was attempted to compare the permanent deformation potential of the coarse graded mixtures with dense graded mixtures. Having determined the type of gradation with lower permanent deformation, the amount of fiber to improve the mechanical behavior of the samples made with this type of gradation was investigated. Finally, the creep behavior of the samples was estimated under different temperature. Test results show that dense graded mixtures had higher permanent deformation susceptibility than coarse graded mixtures, the fiber-modified mixture had better effects on improvement of permanent deformation resistance than the others, the sensitivity of fiber-modified asphalt to temperature was less than normal heavy traffic asphalt mixture.%采用伺服液压试验机(UTM-25)对普通重交沥青和聚酯纤维改性沥青混合料进行动态蠕变试验,对比分析了粗、细级配沥青混合料的抗永久变形能力.在抗变形能力较好的粗级配混合料中,分别进行不同掺量聚酯纤维和温度的动态蠕变试验.试验结果表明:粗级配沥青混合料比细级配的具有更好的抗永久变形能力;在最佳掺量时,纤维改性沥青混合料抗永久变形能力更优越;纤维改性沥青混合料对温度敏感性明显小于普通重交沥青混合料的.
展开▼
