70#沥青在季冻地区公路工程中的应用研究
发布时间：2018-09-03 18:07
【摘要】：我国季冻地区公路沥青路面普遍使用90#重交通沥青,然而部分路段严重的车辙早期病害表明,在交通量较大的条件,使用90#沥青混合料难以满足公路高温性能要求,对车辙病害严重路段的调查及现场取芯试验显示,高速公路车辙病害多产生于路面中、下面层,对此进行的相关分析表明,在车辆重载作用下,沥青混凝土路面剪应力最大区域通常位于路表面以下4～9cm处,即路面的中、下面层。对于交通量较大的公路而言,由于采用的90#沥青高温抗变形能力不足,在较高的温度及剪应力作用下,路面中、下面层产生较大的形变,致使路面产生严重的车辙病害。为此,本研究将70#沥青应用于季冻地区公路沥青路面的中、下面层,以提高路面的高温抗车辙性能。通过对吉林省已采用70#沥青的高速公路路况进行调查及70#沥青路面病害形式和病害成因的分析,初步掌握了70#沥青应用于季冻地区中、下面层的适用性及适用条件。通过室内试验对70#沥青、70#沥青胶浆及70#沥青混合料路用性能进行了对比试验研究,提出了70#沥青高低温性能等级,并在调查和室内试验的基础上结合季冻地区的气候特点及交通组成情况提出了70#沥青在不同冻区的适用层位及路面结构形式。采用壳牌路面计算程序对提出的路面结构形式进行了力学分析,并通过铺筑试验路验证了提出的结构形式的合理性,同时总结了70#沥青路面的施工工艺及施工关键技术,以指导70#沥青在季冻地区公路工程中的应用。研究表明,在季冻地区公路沥青路面的中、下面层采用70#沥青可在不增加工程造价的基础上,改善路面的高温抗车辙性能,提高公路的运营质量及使用寿命,具有一定推广应用价值。
[Abstract]:90# heavy traffic asphalt is widely used on highway asphalt pavement in China's seasonal frozen area. However, the serious rutting early disease in some sections of road shows that the use of 90# asphalt mixture is difficult to meet the requirements of highway high temperature performance under the condition of large traffic volume. The investigation and core-taking test on the serious section of rutting disease show that the rutting disease of expressway mostly occurs in the road surface and the bottom layer. The correlation analysis shows that under the action of heavy load, The maximum shear stress of asphalt concrete pavement is usually located at the 4~9cm below the road surface, that is, the middle and lower layer of the pavement. For the highway with large volume of traffic, due to the lack of high temperature and deformation resistance of 90# asphalt, under the action of higher temperature and shear stress, the lower layer of pavement has a large deformation, resulting in serious rutting disease. Therefore, 70# asphalt is applied to the middle and lower layers of highway asphalt pavement in the area of seasonal freezing in order to improve the rutting resistance of pavement at high temperature. Through investigating the highway condition of 70# asphalt in Jilin province and analyzing the form and cause of disease of 70# asphalt pavement, this paper preliminarily grasps the applicability and applicable conditions of 70# asphalt applied in the seasonal frozen area. Through laboratory test, the performance of 70# asphalt paste and 70# asphalt mixture is studied, and the high and low temperature performance grade of 70# asphalt is put forward. On the basis of investigation and laboratory tests, the suitable layers and pavement structure of 70# asphalt in different frozen areas are put forward in combination with the climatic characteristics and traffic composition of seasonal freezing areas. In this paper, the structure of the pavement was analyzed by Shell pavement calculation program, and the rationality of the structure was verified by paving test road. The construction technology and key technology of 70# asphalt pavement were summarized. In order to guide the application of 70# asphalt in highway engineering in seasonal freezing area. The research shows that the 70# asphalt can improve the high temperature rutting resistance of the road surface and improve the operation quality and service life of the road without increasing the project cost in the middle of the highway asphalt pavement in the seasonal frozen area. It has certain popularization and application value.
【学位授予单位】：大连海事大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U414
，
本文编号：2220763
[Abstract]:90# heavy traffic asphalt is widely used on highway asphalt pavement in China's seasonal frozen area. However, the serious rutting early disease in some sections of road shows that the use of 90# asphalt mixture is difficult to meet the requirements of highway high temperature performance under the condition of large traffic volume. The investigation and core-taking test on the serious section of rutting disease show that the rutting disease of expressway mostly occurs in the road surface and the bottom layer. The correlation analysis shows that under the action of heavy load, The maximum shear stress of asphalt concrete pavement is usually located at the 4~9cm below the road surface, that is, the middle and lower layer of the pavement. For the highway with large volume of traffic, due to the lack of high temperature and deformation resistance of 90# asphalt, under the action of higher temperature and shear stress, the lower layer of pavement has a large deformation, resulting in serious rutting disease. Therefore, 70# asphalt is applied to the middle and lower layers of highway asphalt pavement in the area of seasonal freezing in order to improve the rutting resistance of pavement at high temperature. Through investigating the highway condition of 70# asphalt in Jilin province and analyzing the form and cause of disease of 70# asphalt pavement, this paper preliminarily grasps the applicability and applicable conditions of 70# asphalt applied in the seasonal frozen area. Through laboratory test, the performance of 70# asphalt paste and 70# asphalt mixture is studied, and the high and low temperature performance grade of 70# asphalt is put forward. On the basis of investigation and laboratory tests, the suitable layers and pavement structure of 70# asphalt in different frozen areas are put forward in combination with the climatic characteristics and traffic composition of seasonal freezing areas. In this paper, the structure of the pavement was analyzed by Shell pavement calculation program, and the rationality of the structure was verified by paving test road. The construction technology and key technology of 70# asphalt pavement were summarized. In order to guide the application of 70# asphalt in highway engineering in seasonal freezing area. The research shows that the 70# asphalt can improve the high temperature rutting resistance of the road surface and improve the operation quality and service life of the road without increasing the project cost in the middle of the highway asphalt pavement in the seasonal frozen area. It has certain popularization and application value.
【学位授予单位】：大连海事大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U414
，
本文编号：2220763
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