抗紫外光添加剂对改善沥青及沥青混合料路用性能的对比研究

发布时间：2018-04-05 14:20

本文选题：紫外光老化　切入点：抗紫外光添加剂　出处：《西安建筑科技大学》2015年硕士论文

【摘要】：沥青及沥青混合料抗紫外光老化研究正处于发展阶段,目前主要向沥青中加入抗紫外光添加剂来提高沥青及沥青混合料的抗紫外光老化性能,但是抗紫外光添加剂种类繁多且大多只是针对单种抗紫外光添加剂对沥青的抗紫外光老化性能进行研究,关于复配抗紫外光添加剂对沥青及沥青混合料抗紫外光老化性能的研究却涉及很少,因此有必要寻找抗紫外光添加剂合适的复配类型并展开其对改善沥青及沥青混合料抗紫外光老化性能的研究。选取UV-531,Ti O2,Si O2三种抗紫外光添加剂,首先通过试验研究对比分析单种抗紫外光添加剂和各类型复配抗紫外光添加剂对沥青及沥青混合料抗紫外光老化性能的改善效果,以确定最佳的抗紫外光添加剂类型及剂量,其次采用ABAQUS有限元软件对上面层加入各类型抗紫外光添加剂的路面结构进行模拟计算,以说明上述确定的抗紫外光添加剂对经紫外光老化的路面结构受力性能的改善效果,最后进行沥青砂涂层设计,按最佳剂量向沥青砂中加入上述确定的抗紫外光添加剂,分别对加涂层和未加涂层沥青混合料试件进行紫外光老化后的高低温性能试验,通过对比分析说明不同级配和厚度的沥青砂涂层对沥青混凝土路面抗紫外光老化性能的改善效果,以确定沥青砂涂层在沥青路面抗紫外光老化方面的作用。得出如下结论:(1)复配抗紫外光添加剂对改善沥青及沥青混合料抗紫外光老化性能具有更好的效果,复配类型为UV-531+Ti O2,复配比例为1:2.5,但是对于年平均气温较低、紫外光照较弱地区向沥青中加入剂量为1%的UV-531效果会更好;抗紫外光添加剂应采用高速剪切机与沥青拌合,拌合温度建议选择160℃,搅拌时间不少于20min。(2)沥青砂涂层可以提高沥青混凝土的抗紫外光老化能力,但是涂层厚度不宜过后,以基本完全填充路表面空隙为最好,建议理论厚度为2mm,高温方面沥青砂设计级配LS3效果最好,低温方面沥青砂设计级配LS2效果最好,两种设计级配说明沥青砂涂层设计中适当提高粒径较大集料的比例效果会更好。
[Abstract]:The research on the ultraviolet aging resistance of asphalt and its mixture is in the developing stage. At present, the anti-ultraviolet light additive is mainly added to the asphalt to improve the anti-UV aging performance of asphalt and asphalt mixture.However, there are many kinds of anti-ultraviolet light additives, and most of them are only aimed at the study of the anti-UV aging performance of asphalt by a single anti-ultraviolet light additive.However, there is little research on the anti-UV aging performance of asphalt and its mixture.Therefore, it is necessary to search for a suitable compound type of UV-resistant additives and to study the improvement of UV aging resistance of asphalt and its mixture.In this paper, three kinds of UV-531TiO2-SiO2 anti-UV additives are selected. Firstly, the effects of single anti-UV additives and various kinds of anti-UV additives on the anti-UV aging performance of asphalt and asphalt mixture are compared and analyzed.In order to determine the best type and dosage of anti-ultraviolet light additives, the structure of road surface with various anti-UV additives in the upper layer was simulated and calculated by ABAQUS finite element software.In order to explain the improvement effect of the UV light resistant additive on the mechanical properties of the road structure aged by ultraviolet light, the asphalt sand coating was designed, and the UV light resistant additive was added to the asphalt sand according to the optimum dosage.The high and low temperature performance tests of asphalt mixture specimens with or without coating were carried out after UV aging.The effect of asphalt sand coating with different gradation and thickness on the UV aging resistance of asphalt concrete pavement is explained by comparison and analysis, in order to determine the effect of asphalt sand coating on the UV aging resistance of asphalt pavement.The conclusion is as follows: (1) the composite UV additive has a better effect on improving the UV aging resistance of asphalt and asphalt mixture. The compound type is UV-531 TIO _ 2, and the ratio is 1: 2.5, but the annual average temperature is low.It would be better to add 1% UV-531 to the asphalt in the region with weak ultraviolet radiation, and the anti-UV additive should be mixed with asphalt by high speed shearing machine, and the mixing temperature should be 160C.Agitating time is not less than 20 min. 2) Asphalt sand coating can improve the anti-UV aging ability of asphalt concrete, but the coating thickness should not be later, and the best one is to fill the gap of road surface completely.It is suggested that the theoretical thickness is 2 mm, the LS3 effect of asphalt sand design grade is the best in high temperature, and the best effect is asphalt sand design grade LS2 in low temperature. It is better to increase the proportion of large particle size aggregate in the design of asphalt sand coating with two design grades.
【学位授予单位】：西安建筑科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U414

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