桂来高速公路沥青路面施工质量控制及病害原因分析

发布时间：2019-05-26 23:09

【摘要】：自从4万亿计划实施以来,我国加大了基础设施建设,极大促进了高速公路的蓬勃发展。由于水泥混凝土路面维修困难等缺点,沥青路面逐步替代水泥混凝土路面成为了我国公路的主要路面结构。由于交通量大幅上升,导致实际交通量比预估交通量大,路面承受不了重载的作用等原因,沥青路面出现早期破坏情况普遍。为了提高沥青路面的服务质量,增长沥青路面的使用寿命,研究沥青路面的施工控制技术很有必要。本文以桂来高速公路为依托,以实际调查结果和大量试验数据为基础,首先对沥青路面上面层AC-13、中面层AC-20、下面层AC-25进行了目标配合比设计;基于沥青混合料空隙率、间隙率偏小的原因,对AC-13的混合料级配进行了优化;结合实体工程的地质和气候特点以及项目的建管模式,提出了适应桂来高速公路沥青路面的施工质量控制方案。其次,基于对施工质量控制的需要,对车辙试验、表干法测定试件密度或相对密度试验和集料与沥青粘附性等试验方法进行了探讨。最后,针对桂来高速公路建设工程中存在的中面层泛白、基层损伤、冒水现象等质量问题,分析其产生的主要成因,结果表明,桂来高速中面层AC-20泛白主要是由于施工工序不规范导致的,沥青和集料粘附性较差以及集料抗压碎性能不强等也对泛白病害的产生起了一定的催化作用;基层损伤是由于施工工序的不合理安排、工期的延长、施工运输车辆超载以及偷工减料等原因造成;冒水是由于施工过程不精细,导致冒水路段压实度不够,空隙率较大,加之中央分隔带边缘没有及时施工完成,导致雨水下渗引起的,在此基础上提出相应的解决措施。
[Abstract]:Since the implementation of the 4 trillion plan, China has increased infrastructure construction and greatly promoted the vigorous development of highways. Due to the difficulty of maintenance of cement concrete pavement, asphalt pavement has gradually replaced cement concrete pavement as the main pavement structure of highway in our country. Due to the sharp increase of traffic volume, the actual traffic volume is larger than the estimated traffic volume, the pavement can not bear the effect of heavy load and so on, the early damage of asphalt pavement is common. In order to improve the service quality of asphalt pavement and increase the service life of asphalt pavement, it is necessary to study the construction control technology of asphalt pavement. In this paper, based on Guilai Expressway, based on the actual investigation results and a large number of test data, firstly, the target mix ratio design of AC-25 in the middle layer of AC-13, middle layer of asphalt pavement is carried out. Based on the reason that the voidage and clearance of asphalt mixture are too small, the gradation of AC-13 mixture is optimized. According to the geological and climatic characteristics of the solid project and the construction and management mode of the project, the construction quality control scheme suitable for the asphalt pavement of Guilai Expressway is put forward. Secondly, based on the need of construction quality control, the rut test, the test method of measuring specimen density or relative density by surface dry method and the test method of adhesion between aggregate and asphalt are discussed. Finally, in view of the quality problems existing in the construction project of Guilai Expressway, such as whitening of the middle layer, damage of the base course and the phenomenon of water discharge, the main causes of the formation are analyzed. The results show that, The whitening of AC-20 in the middle layer of Guilai high speed is mainly caused by the non-standard construction process. The poor adhesion of asphalt and aggregate and the weak crushing resistance of aggregate also play a certain catalytic role in the occurrence of whitening disease. The damage of base course is caused by unreasonable arrangement of construction process, extension of construction period, overload of construction transport vehicles and cutting corners. The water discharge is caused by the infineness of the construction process, which leads to the insufficient compaction degree and the large voidage, and the construction of the edge of the central separator is not completed in time, which leads to the infiltration of Rain Water. On this basis, the corresponding solutions are put forward.
【学位授予单位】：长沙理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U416.217;U418.6

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