基于试验工程的高寒地区沥青中面层混合料设计与施工

Design and Construction of Asphalt Pavement Mixture Used in Middle Course in High-Altitude and Cold Regions Based on Experimental Engineering

高寒地区修建完工后沥青路面公路通常在1~3年内沥青面层即会出现各种病害,导致使用寿命降低。基于此,考虑沥青中面层混合料的性能至关重要,进行相关研究。本项目以四川省境内的久马高速作为依托,分析了四川高寒地区沥青路面常见病害问题形成原因,根据以往研究发现车辙及坑槽病害形成原因与沥青路面中面层抗车辙性能及路面施工工艺有紧密关系。因此,本文对高寒地区沥青路面施工工艺及中面层设计提出了方案及建议,其中包括对中面层AC-20C沥青混合料的配合比进行了分析及试验,得出了符合效果规范的生产配合比;并根据试验结果进行了试验路段的铺筑,在铺筑过程中对拌和、运输、摊铺、碾压提出了相关要求及建议;并对最终成型的试验路段进行检测,并基于试验工程总结了四个最为关键的要点以指导后续施工:最终,试验段压实度代表值为98.21%。平整度平均值为1.13 mm,取得良好效果,中面层的设计与施工方案为该工程提供了重要的数据及样本。

After the completion of construction in high-altitude areas, asphalt pavement highways usually experience various diseases on the asphalt surface layer within 1~3 years, leading to a decrease in service life. Based on this, it is crucial to consider the performance of asphalt pavement mixtures and conduct relevant research. This project is based on the Jiuma Expressway in Sichuan Province, and analyzes the causes of common diseases on asphalt pavement in high-altitude and cold areas of Sichuan. Based on previous research, it has been found that the causes of rutting and potholes are closely related to the anti rutting performance of the asphalt pavement surface layer and the pavement construction technology. Therefore, this article proposes plans and suggestions for the construction technology of asphalt pavement and the design of the middle surface layer in high- altitude and cold regions, including analyzing and testing the mix proportion of AC-20C asphalt mixture in the middle surface layer, and obtaining a production mix proportion that meets the effect specifications;And based on the test results, the paving of the test section was carried out, and relevant requirements and suggestions were put forward for mixing, transportation, paving, and rolling during the paving process;and the final formed test section was tested, and based on the test engineering, four key points were summarized to guide subsequent construction: finally, the representative value of the compaction degree of the test section was 98.21%. The average flatness value is 1.13 mm, achieving good results. The design and construction plan of the middle layer provide important data and samples for the project.