SBS改性沥青紫外老化研究

发布时间：2018-04-14 01:39

本文选题：SBS改性沥青 + 紫外线光老化　；参考：《武汉工程大学》2014年硕士论文

【摘要】：SBS改性沥青曝露在高温和紫外辐射中会发生热氧老化和紫外老化,均会导致SBS改性沥青的路用性能和使用寿命下降。研究SBS改性沥青的热氧老化和紫外老化对于改善SBS改性沥青路用性能十分重要,目前已有很多SBS改性沥青热氧老化和紫外老化的相关研究,这些研究大多是针对SBS改性沥青整体体系进行研究,但SBS改性沥青各组分在热氧老化和紫外老化过程中会相互影响,导致对SBS改性沥青老化行为的深层认识仍有限。本文建立了SBS的分离方法并研究了SBS改性沥青的紫外老化过程,以SBS改性沥青为原料,用薄膜烘箱老化试验方法模拟SBS改性沥青混合料在储运、施工、拌合过程中发生的短期老化,再采用紫外辐射试验箱方法和自然光老化方法对SBS改性沥青进行室内、外紫外老化试验,对不同老化时间和老化方式的SBS改性沥青进行外观观察和荧光显微观察,最后将四个组分和SBS改性剂分离出来,并且用红外光谱分析各个组分随老化时间延长的结构变化,本研究为更准确地分析出SBS改性沥青的热氧老化和紫外老化机理打下基础,对评价与预测SBS改性沥青的光氧化性能具有重要的意义。通过对以上内容的分析研究,本论文主要得到以下结论:1.设计新的SBS分离方法并证明其可行,但该方法会造成SBS的少量损失和含有部分芳香分和胶质。2.随着老化时间延长SBS改性沥青表面颜色由黑色向灰色转变,有明显的硬化收缩现象且皱纹增多增大,荧光显微镜分析发现SBS颗粒在基质沥青中呈分散状态。3.通过对不同老化时间的SBS改性沥青进行各组分测定,可得知紫外老化后SBS改性沥青的总体变化趋势为饱和分、芳香分、SBS含量降低,胶质、沥青质含量和Ic值上升。4.通过傅立叶红外光谱分析SBS改性沥青各组分的组成,最明显的变化是紫外老化后羰基和亚砜基含量增加,聚丁二烯的特征峰含量降低。
[Abstract]:The exposure of SBS modified asphalt to high temperature and ultraviolet radiation will lead to thermal oxygen aging and ultraviolet aging, which will lead to the decrease of pavement performance and service life of SBS modified asphalt.It is very important to study the thermal oxygen aging and ultraviolet aging of SBS modified asphalt for improving the performance of SBS modified asphalt. At present, there have been many researches on thermal oxygen aging and ultraviolet aging of SBS modified asphalt.Most of these studies are aimed at the whole system of SBS modified asphalt, but the components of SBS modified asphalt will affect each other in the process of thermal oxygen aging and ultraviolet aging, which leads to a limited understanding of the aging behavior of SBS modified asphalt.In this paper, the separation method of SBS was established and the ultraviolet aging process of SBS modified asphalt was studied. Using SBS modified asphalt as raw material, the aging test method of membrane oven was used to simulate the storage, transportation and construction of SBS modified asphalt mixture.The short term aging occurred in the mixing process, and then the ultraviolet radiation test chamber and natural light aging method were used to carry out the indoor and external ultraviolet aging tests of SBS modified asphalt.The appearance and fluorescence microscopy of SBS modified asphalt with different aging time and aging mode were observed. Finally, four components and SBS modifier were separated out, and the structural changes of each component with aging time were analyzed by infrared spectroscopy.This study lays a foundation for more accurate analysis of thermal oxygen aging and ultraviolet aging mechanism of SBS modified asphalt, and is of great significance to evaluate and predict the photooxidation performance of SBS modified asphalt.Through the above content analysis and research, this paper mainly obtains the following conclusion: 1.A new SBS separation method was designed and proved to be feasible, but this method can cause a small loss of SBS and contain some aromatic and colloidal.With the aging time prolonging, the surface color of SBS modified asphalt changed from black to gray, and there was obvious hardening and shrinkage phenomenon, and the wrinkle increased. Fluorescence microscope analysis showed that SBS particles were dispersed in the matrix asphalt.By measuring the components of SBS modified asphalt with different aging time, it can be seen that the total change trend of SBS modified asphalt after UV aging is saturation fraction, the content of aromatic component of SBS modified asphalt decreases, the content of resin, asphaltene and IC value increase by .4.The composition of SBS modified asphalt was analyzed by Fourier transform infrared spectroscopy. The most obvious change was that the contents of carbonyl and sulfoxide increased and the characteristic peak content of polybutadiene decreased after UV aging.
【学位授予单位】：武汉工程大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U414

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