新型羧基丁苯改性沥青应用于道路路面的试验研究

发布时间：2018-01-18 00:20

本文关键词：新型羧基丁苯改性沥青应用于道路路面的试验研究　出处：《重庆大学》2014年硕士论文　论文类型：学位论文

【摘要】：聚合物改性沥青是近年来实验和实践在道路，特别是高速公路的建设方面，一直被关注的课题之一。由于聚合物的加入，改变了沥青的性质以及指标，如针入度，软化点等，延度等，在一定程度上提高了沥青的性能，使之更能适合复杂的使用环境和道路交通状况，给国民经济建设做出了很大的贡献。然而，在很多地方，高速公路在铺筑不久就会出现道路裂缝，由于裂缝的存在，雨水的进入，提早导致了道路的破坏，严重影响交通顺畅，，并且带来了一定的交通安全。鉴于此，本文在之前的研究基础上拟在石油沥青中添加一种的新型的聚合物来改性沥青，改善沥青混合料的力学性能，特别是疲劳性能，希望能对解决道路裂缝提供一定的参考。在本文中，主要的探究内容包括如下几点： ①本文以重庆的高速公路为研究背景，选取适合重庆地区的石油沥青为基质沥青，在此基础上进行改性。 ②首先测试了基质沥青的针入度，软化点和延度，以验证基质沥青符合标准。之后设计出不同的聚合物添加比例，添加到基质沥青中进行改性，分别测试基质沥青以及添加不同比例聚合物的延度、针入度和软化点，并加以比较，验证不同比例的聚合物添加是否对基质沥青具有改善作用。 ③对聚合物沥青做老化试验，之后分别测试老化前后添加不同百分比的聚合沥青的针入度，软化点和延度，验证添加不同百分比的聚合物改性沥青是否符合要求，并选出合适的聚合物添加比例。 ④用老化试验选出的聚合物添加比例制成聚合物改性沥青，选择合适的集料级配，制作沥青混合料试件等，检测沥青混合料的物理、力学性能指标等，找出聚合物改性沥青的最佳油石比。 ⑤对添加不同百分比的聚合物的沥青以及基质沥青混合料做了疲劳试验，验证其是否对混合料有改良作用，能否满足复杂的环境和路况需求，从而做出是否值得推广的结论。试验结果表明，聚合物的加入对沥青有一定的改性作用，提高了沥青的软化点，改善了高温性能，针入度以及延度有了一定程度的下降；提高了混合料的抗车辙能力，提高了弯拉强度以及劈裂强度，在应力比较小时具有更好的疲劳性能等。
[Abstract]:Polymer modified asphalt has been one of the most important topics in recent years, especially in highway construction. Because of the addition of polymer, the properties and indexes of asphalt have been changed. Such as penetration, softening point, ductility and so on, to a certain extent, improve the performance of asphalt, make it more suitable for the complex use environment and road traffic conditions, and make a great contribution to the national economic construction. In many places, the highway will soon appear road cracks, due to the existence of cracks, Rain Water's entry, early lead to the destruction of the road, seriously affecting the smooth traffic. And bring certain traffic safety. In view of this, this paper proposed to add a new polymer to the asphalt to improve the mechanical properties of asphalt mixture. In particular, fatigue performance, I hope to provide a certain reference to solve road cracks. In this paper, the main content of exploration includes the following points: 1. Taking Chongqing expressway as the research background, this paper selects petroleum asphalt suitable for Chongqing as base asphalt, and then modifies it. Firstly, the penetration, softening point and ductility of the matrix asphalt were tested to verify that the matrix asphalt meets the standard. Then different polymer ratios were designed and added to the matrix asphalt for modification. The ductility, penetration and softening point of matrix asphalt and the addition of different proportion of polymer were tested and compared to verify whether the different proportion of polymer addition could improve the asphalt. 3Aging test of polymer asphalt, after which the penetration, softening point and ductility of polymerized asphalt were tested before and after aging. Verify that different percentage of polymer modified asphalt meet the requirements, and select the appropriate proportion of polymer. (4) Polymer modified asphalt was made by adding proportion of polymer selected by aging test, suitable aggregate gradation was selected, asphalt mixture specimen was made, physical and mechanical performance index of asphalt mixture was tested. To find out the best bitumen ratio of polymer modified asphalt. 5. The fatigue test of asphalt and matrix asphalt mixture with different percentage of polymer was carried out to verify whether it can improve the mixture and meet the needs of complex environment and road conditions. In order to draw a conclusion that is worth popularizing. The results show that the addition of polymer can improve the softening point of asphalt, improve the high temperature performance, and decrease the penetration and ductility to a certain extent. The rutting resistance of the mixture is improved, the flexural strength and splitting strength are improved, and the fatigue performance is better when the stress is low.
【学位授予单位】：重庆大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U414

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