基于灰色关联分析的沥青混合料紫外线老化影响因素研究

发布时间：2018-03-28 06:08

本文选题：沥青混合料　切入点：紫外线老化　出处：《西安建筑科技大学》2015年硕士论文

【摘要】：我国青藏高原、内蒙古高原、陕甘黄土高原地区海拔高气压低、太阳年辐射时数长,因强紫外线辐射引起的沥青路面老化现象日趋严重,沥青混合料的紫外线老化问题越来越受到人们的关注。分析沥青混合料紫外线老化影响因素,认识不同因素对沥青混合料紫外线老化的影响规律,对深入研究沥青混合料紫外线老化现象及老化机理具有重要的意义。论文首先对太阳紫外辐射光谱及沥青紫外老化机理做了简要分析,确定使用与太阳紫外辐射光谱相似的紫外高压汞灯作为光源,构建室内紫外线老化环境箱,然后从紫外线辐射强度及辐射时长、沥青性质、矿料级配、油石比四个方面,通过室内紫外线老化试验,以动稳定度和低温劈裂强度作为高低温性能的评价指标,对沥青混合料紫外线老化影响因素进行了详细研究,给出了各因素对沥青混合料高低温性能紫外线老化的影响规律,最后运用灰色关联分析方法对沥青混合料紫外线老化影响因素进行分析,明确了动稳定度及低温劈裂强度紫外线老化影响因素的排序,为强紫外线辐射地区沥青路面的设计工作提供理论依据。外部环境因素,尤其是紫外线辐射强度是影响沥青混合料高低温性能紫外线老化的最主要因素。从关键筛孔通过率及沥青性能指标的排序来看,矿料级配对沥青混合料高低温性能紫外线老化的影响程度大于沥青结合料。在级配组成中,0.075mm筛孔通过率对动稳定度紫外线老化的影响最大,而4.75mm筛孔通过率对低温劈裂强度紫外线老化的影响最大;在沥青性能指标中,软化点对动稳定度紫外线老化的影响较大,而针入度对低温劈裂强度紫外线老化的影响较大。
[Abstract]:In China, the Qinghai-Tibet Plateau, the Inner Mongolia Plateau and the Shaanxi-Gansu Loess Plateau area have high air pressure, long annual solar radiation hours, and the aging phenomenon of asphalt pavement caused by strong ultraviolet radiation is becoming more and more serious. People pay more and more attention to the problem of ultraviolet aging of asphalt mixture. This paper analyzes the influencing factors of ultraviolet aging of asphalt mixture, and recognizes the influence law of different factors on ultraviolet aging of asphalt mixture. It is of great significance to study the ultraviolet aging phenomenon and aging mechanism of asphalt mixture. Firstly, the ultraviolet radiation spectrum of the sun and the ultraviolet aging mechanism of asphalt are briefly analyzed in this paper. The ultraviolet high-pressure mercury lamp, which is similar to the ultraviolet radiation spectrum of the sun, is used as the light source to construct the indoor ultraviolet aging environment box. Then the ultraviolet radiation intensity and radiation duration, the asphalt property, the gradation of the mineral aggregate and the ratio of oil and stone are four aspects. Taking dynamic stability and low temperature splitting strength as the evaluation index of high and low temperature performance, the influence factors of ultraviolet aging of asphalt mixture were studied in detail through ultraviolet aging test. The influence of various factors on the ultraviolet aging of asphalt mixture at high and low temperature is given. Finally, the influence factors of ultraviolet aging of asphalt mixture are analyzed by using grey relation analysis method. The order of influence factors of dynamic stability and low temperature splitting strength on ultraviolet aging is determined, which provides theoretical basis for the design of asphalt pavement in the area of strong ultraviolet radiation. In particular, the ultraviolet radiation intensity is the most important factor that affects the high and low temperature performance of asphalt mixture. The influence of mineral gradation on the UV aging of asphalt mixture at high and low temperature is greater than that on bituminous binder. In the gradation composition, the passing rate of 0.075mm sieve hole has the greatest influence on the dynamic stability of UV aging. However, the pass rate of 4.75mm sieve hole has the greatest effect on the UV aging of low temperature splitting strength, and the softening point has a great effect on the dynamic stability ultraviolet aging, while the penetration on the low temperature splitting strength UV aging.
【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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