厂拌热再生沥青混合料力学性能及应用研究

发布时间：2018-10-08 16:14

【摘要】：通过室内试验测定了沥青路面回收料(RAP)中回收沥青的性能和集料级配;通过规划求解及马歇尔试验确定了AC-13型和AC-16型再生沥青混合料的配合比及新添沥青用量,并通过车辙试验、冻融劈裂试验和小梁低温弯曲破坏试验对其力学性能进行了评价;测试了AC-16型再生沥青混合料不同温度、不同RAP掺量(质量分数)、老化前后及添加再生剂前后的劈裂强度和抗压回弹模量,并采用万能材料试验机UTM对该混合料进行了间接拉伸疲劳试验.结果表明:随着RAP掺量的提高,再生沥青混合料的动稳定度增大,单次冻融循环残留强度比略微增加,多次冻融循环残留强度比快速衰减,低温抗裂性变差;抗压回弹模量呈线性递增,劈裂强度在不同参数下表现出不同的规律,而疲劳寿命及其对应力的敏感度均呈下降趋势.最后,结合试验路段对上述试验结果进行了验证.
[Abstract]:The performance and aggregate gradation of recycled asphalt in (RAP) are measured through laboratory tests, and the mix ratio of AC-13 type and AC-16 type recycled asphalt mixture and the amount of new asphalt are determined by planning solution and Marshall test. The mechanical properties were evaluated by rutting test, freeze-thaw splitting test and low temperature bending failure test of trabeculae, and the different temperatures of AC-16 recycled asphalt mixture were tested. The splitting strength and compressive resilience modulus of the mixture before and after aging and before and after the addition of regenerating agent were studied with different RAP content (mass fraction). The indirect tensile fatigue test of the mixture was carried out by using universal material testing machine (UTM). The results show that with the increase of RAP content, the dynamic stability of recycled asphalt mixture increases, the residual strength ratio of single freeze-thaw cycle increases slightly, the residual strength ratio of multiple freeze-thaw cycles decreases rapidly, and the cracking resistance at low temperature becomes worse. The modulus of compressive resilience increases linearly, the splitting strength shows different rules under different parameters, while the fatigue life and its sensitivity to stress decrease. Finally, the above test results are verified by the test section.
【作者单位】：重庆交通大学土木工程学院;重庆重交沥青砼股份有限公司;贵州融达公路桥梁工程有限责任公司;
【基金】：重庆市科技攻关项目(cstc2012ggA50001)
【分类号】：U414

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