紫外老化对沥青及沥青混合料高低温性能的影响

关键字：道路工程,沥青,沥青混合料,紫外老化,高温性能

（1.中交第一公路勘察设计研究院有限公司，陕西 西安  710075；2.长安大学 教育部特殊地区公路工程重点实验室，陕西 西安  710064）

    摘要：为研究紫外老化对沥青及沥青混合料的高低温性能的影响，开展了沥青及沥青混合料的紫外老化试验。结果显示：在低温性能方面，紫外老化后，沥青的劲度增大，蠕变速率减小，并且在初始阶段增加较为明显；沥青混合料的低温弯曲试验结果显示，紫外老化对小梁的弯拉应变影响较小；在高温性能方面，DSR试验结果显示，紫外老化后沥青的粘弹性组分比例发生了变化，当温度较低时，复数模量会随着频率的增加先增大后减小，当温度较高时，复数模量会随着频率的增加呈线性增大。沥青混合料在紫外老化后其动稳定度有所增加，车辙深度逐渐减小。
    关键词：道路工程；沥青；沥青混合料；紫外老化；高温性能；低温性能
    中图分类号：TU535；U214.7        文献标识码：A        文章编号：1001-702X（2017）05-0009-04

Effect of ultraviolet aging on high and low temperature performance of asphalt and asphalt mixture
　　 DING Biao1，KE Wenhao1，ZUO Xing1，LEI Yu1，ZOU Xiaolong2
（1.CCCC First Highway Consultants Co. Ltd.，Xi'an 710075，China；2.Key Laboratory of Special Area Highway Engineering of Ministry of Education，Chang'an University，Xi'an 710064，China）

    Abstract：In order to study the effect of ultraviolet aging on the high and low temperature performance of asphalt and asphalt mixture，the ultraviolet aging test has been carried out. The results show that：at low temperature performance，the stiffness of asphalt increases and creep rate decreases after ultraviolet aging，which is more obvious at the initial stage of reaction. Results of bending test at low temperature show that UV aging has little effect on the anti-cracking performance of asphalt mixture. The results of DSR test show that the ratio of viscoelastic components of asphalt has changed after UV aging，and complex modulus of high temperature has certain relation with temperature at low temperature，they increase linearly with frequency at first and then decreases，while at high temperature，they increase linearly with frequency. The dynamic stability of asphalt mixture after UV aging is increased，and the rutting depth decreases gradually.
    Key words：road engineering，asphalt，asphalt mixture，UV aging，high-temperature performance，low-temperature performance