橡胶沥青混合料的空隙率对水损害的影响研究

发布时间：2018-06-01 22:37

本文选题：橡胶沥青 + 水损害　；参考：《重庆交通大学》2015年硕士论文

【摘要】：各国道路科研工作者在对沥青路面早期破坏现象广泛调查和研究基础上发现,沥青路面早期破坏现象或直接或间接与水损害有关,在我国的沥青路面中也很突出,并具有普遍性。而沥青路面的水损害虽然与许多因素有关,但空隙率(压实度)是影响沥青路面的水损害最重要的因素之一。因此研究空隙率对沥青路面或混合料水损害的影响一直受到研究者们的关注。近年来,对沥青路面水损害的防治措施的研究中使用橡胶沥青混合料改善路面水损害问题被认为具有明显的效果,因此得到广泛重视,加之我国废旧橡胶轮胎产量随着汽车拥有量的与日俱增,解决大量废旧橡胶轮胎对环境污染的问题日益突出和用橡胶粉改性沥青作为路面粘结材料表现出的良好的路用性能,促使橡胶沥青路面(或混合料)的应用正在产生高潮。但是橡胶沥青路面(或混合料)的应用并不是不存在任何问题,比如由于橡胶沥青混合料通常用于沥青路面表面层,根据用途和功能,橡胶沥青混合料可采用不同的级配,而不同级配的橡胶沥青混合料对空隙率要求应该不一样,为了同时满足高低温性能和水稳定性要求,不同级配的橡胶沥青混合料的空隙率应有一个合理的范围。因此研究橡胶沥青混合料的不同空隙率对路用性能的影响,并由此对应提出不同级配的橡胶沥青混合料的合理的空隙率要求,对指导橡胶沥青混合料配合比设计和路面施工中对压实度的控制具有重要的理论意义和现实意义。鉴于此,本课题主要研究在相同矿质混合料级配下,不同空隙率对橡胶沥青混合料水损害的影响,并提出相应合理的空隙率范围,以减少沥青路面发生水损害的机率,提高路面的使用性能。首先,根据试验规范要求,通过室内试验,对试验所用的原材料检测。其次,通过马歇尔试验方法确定五种不同级配的橡胶沥青混合料的最佳沥青用量。以确定的最佳沥青用量为基础制作空隙率不同的马歇尔试件和标准车辙试件,依次进行劈裂试验、冻融劈裂试验及车辙试验、浸水车辙试验。最后,对劈裂试验、冻融劈裂试验及车辙试验、浸水车辙试验得到的冻融劈裂强度比和动稳定度的数据进行处理,分析探讨空隙率与橡胶沥青路面水稳定性之间的关系。研究表明,相同矿质混合料级配下,橡胶沥青混合料在不同空隙率时水稳定性有差异,在合理的空隙率范围内,橡胶沥青混合料的水稳定性能较好。本文的研究结果将为今后橡胶沥青路面施工质量中对压实度的控制提供一定的参考依据。对于橡胶沥青路面而言,适宜的空隙率是至关重要的。只有当空隙率设计适当时,沥青混凝土路面的水损害、高温车辙等早期破坏,才会减少到最小程度。
[Abstract]:On the basis of extensive investigation and research on the early damage phenomenon of asphalt pavement, road researchers in various countries find that the early damage phenomenon of asphalt pavement is directly or indirectly related to water damage, and it is also prominent in the asphalt pavement of our country. And universal. Although the water damage of asphalt pavement is related to many factors, the porosity (compactness) is one of the most important factors affecting the water damage of asphalt pavement. Therefore, the influence of porosity on asphalt pavement or mixture water damage has been concerned by researchers. In recent years, the use of rubber asphalt mixture to improve the water damage of asphalt pavement is considered to have obvious effect in the research of prevention and cure measures of water damage of asphalt pavement, so it has been paid more and more attention. In addition, with the increasing production of waste rubber tires in China, the problem of environmental pollution caused by a large number of waste rubber tires is becoming more and more prominent, and the good road performance of asphalt modified with rubber powder as the adhesive material of road surface. The application of rubber asphalt pavement (or mixture) is emerging. However, the application of rubber asphalt pavement (or mixture) is not without any problems. For example, because rubber asphalt mixture is usually used in the surface layer of asphalt pavement, rubber asphalt mixture can be graded according to its use and function. In order to meet the requirements of high and low temperature performance and water stability, the void ratio of rubber asphalt mixture with different grades should be within a reasonable range. Therefore, the influence of different voids of rubber asphalt mixture on road performance is studied, and the reasonable voidage requirement of rubber asphalt mixture with different gradation is put forward. It is of great theoretical and practical significance to guide the mix proportion design of rubber asphalt mixture and the control of compaction degree in pavement construction. In view of this, this paper mainly studies the influence of different voids on the water damage of rubber asphalt mixture under the same gradation of mineral mixture, and puts forward the corresponding reasonable voidage range in order to reduce the probability of water damage on asphalt pavement. Improve the pavement performance. First of all, according to the requirements of the test specifications, through the laboratory tests, test the raw materials used in the test. Secondly, the optimum asphalt content of five rubber asphalt mixtures with different gradation is determined by Marshall test method. The Marshall specimen and standard rutting specimen with different porosity were made on the basis of the optimum asphalt content. The splitting test, freeze-thaw splitting test and rutting test were carried out in turn, and the wet rutting test was carried out. Finally, the data of splitting test, freeze-thaw splitting test, rutting test and rutting test are processed, and the relationship between void ratio and water stability of rubber asphalt pavement is analyzed. The results show that the water stability of rubber asphalt mixture is different with different voids under the same mineral mixture gradation, and the water stability of rubber asphalt mixture is better in the reasonable voidage range. The research results of this paper will provide a certain reference for the control of compaction degree in the construction quality of rubber asphalt pavement in the future. For rubber asphalt pavement, the suitable void ratio is very important. Only when the void ratio is properly designed, the early damage of asphalt concrete pavement such as water damage and high temperature rutting will be minimized.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U414

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