沥青路面水损害机理分析及对策研究

发布时间：2018-01-25 05:19

本文关键词： 沥青路面水损坏抗剥落剂空隙率改善施工　出处：《山东大学》2014年硕士论文　论文类型：学位论文

【摘要】：20世纪80年代末期我国大陆首条高速公路建成通车,以此为起点我国高速公路进入了一个高速发展的时期。从1998年,国家开始对交通行业进行统一部署,到2013年底,我国已建成通车的高速公路已经超过十万公里,位居世界第一,经过短短二十几年发展,我国的高速公路建设取得的成果达到西方发达国家几十年的发展水平,发展之快,成就之大,举世瞩目。根据我国交通运输“十二五”规划,到2015年底,我国高等级公路通车总长度将会达到10.8万公里,目前我国修建高速公路85%以上都是沥青混凝土路面。然而,在取得巨大成就的同时,我国高速公路的水损坏现象也十分严重。沥青混凝土组合结构是我国高速公路普遍使用的路面结构类型,沥青路面由于自身所不可避免的具有空隙的原因,使得水分得以相对比较容易的进入路面结构。而沥青混合料中的集料所具有的天然的亲水性导致沥青膜易被水取代。而失去粘结剂的沥青混凝土就会分崩离析,不再拥有承受荷载的强度。从而使得沥青路面在荷载的作用下不断破坏,最终会导致路面结构的整体破坏,使得道路失去其自身具有的社会和经济价值,引发严重的后果。因此,对于沥青路面抵抗水损害的研究十分必要。国内外的道路研究人员已经进行了大量的卓有成效的研究,但大多集中于室内试验研究,没有同具体建设项目结合起来。本文以四川乐自高速公路建设项目为依托,结合国内外研究人员的研究成果,从室内试验和现场施工两方面入手对如何控制预防沥青路面的水损害问题进行了研究。首先,总结分析了国内外对于沥青路面水损害的研究成果,并以这些结论为基础,分析了四川省已建成的高速公路出现水损害的成因,对四川以后的高速公路的新建与养护施工起到一定的参照作用。其次,根据调查研究的乐自高速公路所属的气候条件与地理位置,设计并实施了室内试验,确定了乐自高速设计阶段所需考虑的提高路面抵抗水损害能力的措施,即所需添加的抗剥落剂的种类以及添加量。并且确定了上面层的最佳空隙率,对路面的现场施工具有指导意义。最后,作者根据多年来在四川进行高速公路沥青路面的施工和项目管理的经验,结合当地的气候条件、交通条件以及路面的结构组合情况,提出了改善施工的具体措施以及关键控制节点,最大限度的减少人为因素导致的路面的水损坏,具有良好的实用性和适用性。本文既从理论上对沥青路面水损害的发生进行了研究,又设计实施了大量的室内试验进行验证,最后得以应用于具体的建设项目之上,具有理论指导实践的清晰链条,对四川以后新建高速公路项目也具有具体的指导作用。
[Abstract]:In the end of 1980s, the first expressway in mainland China was built and opened to traffic, which is the starting point of China's expressway has entered a period of rapid development. Since 1998. By end of 2013, the highway that had been built and opened to traffic in our country had already exceeded 100,000 kilometers, ranking first in the world, and after 20 years of development. The achievements of highway construction in our country have reached the development level of the western developed countries for several decades. The rapid development and great achievements have attracted worldwide attention. According to the "12th Five-Year Plan" of transportation in China, by end of 2015. The total length of high grade highway in China will reach 108,000 kilometers. At present, more than 85% highway is asphalt concrete pavement in our country. However, great achievements have been made at the same time. The phenomenon of water damage on expressway in China is also very serious. Asphalt concrete composite structure is a common type of pavement structure used in expressway in China. The asphalt pavement has voids due to its own inevitable reasons. Water can relatively easily enter the pavement structure. The natural hydrophilicity of the aggregate in the asphalt mixture leads to the asphalt film being easily replaced by water. The asphalt concrete without binder will fall apart. No longer have the strength to bear the load, so that the asphalt pavement under the action of the continuous damage, eventually will lead to the overall destruction of the pavement structure, making the road has lost its own social and economic value. Therefore, it is necessary to study the asphalt pavement against water damage. Road researchers at home and abroad have carried out a large number of fruitful research, but mostly focused on indoor experiments. It has not been combined with specific construction projects. This paper is based on the Sichuan Lezi Expressway construction project, combined with the research results of domestic and foreign researchers. How to control and prevent water damage of asphalt pavement is studied from two aspects of indoor test and field construction. Firstly, this paper summarizes and analyzes the research results of asphalt pavement water damage at home and abroad, and based on these conclusions, analyzes the causes of water damage on the highway built in Sichuan Province. After Sichuan highway construction and maintenance play a certain reference role. Secondly, according to the climatic conditions and geographical location of Lezi Expressway, an indoor test was designed and implemented. The measures to improve the water damage resistance of the pavement are determined, that is, the type and amount of the anti-flaking agent needed to be added, and the optimum void ratio of the upper layer is determined. It is of guiding significance to the field construction of road surface. Finally, according to the experience of construction and project management of asphalt pavement in Sichuan for many years, combined with the local climate conditions, traffic conditions and pavement structure combination. The concrete measures to improve the construction and the key control nodes are put forward to minimize the water damage caused by human factors, which has good practicability and applicability. This paper not only studies the occurrence of asphalt pavement water damage theoretically, but also designs and implements a large number of indoor tests to verify it. Finally, it can be applied to specific construction projects. It has a clear chain of theoretical guidance and practice, and also has a specific guiding role for the new highway project after Sichuan.
【学位授予单位】：山东大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U416.217;U418.6

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