沥青稳定碎石排水层施工技术要点

Construction Technology Essentials for Drainage layer of Asphalt Stabilized Crushed Stone

为减少沥青混凝土路面早期水损害,在路面结构中设置沥青稳定碎石排水层,提高排除进入路面结构内部自由水的能力。对比国外排水沥青混合料的级配,确定适合我国工程运用的级配范围,依托化新高速公路实体工程,设计出沥青稳定碎石的工程级配。通过矿料表面积与油膜厚度估算油石比,结合析漏试验,运用马歇尔试验稳定度、空隙率、毛体积密度等最终确定最佳油石比。分析沥青稳定碎石混合料的特性,结合工程实践,确定沥青稳定碎石的目标配合比和施工配合比。根据沥青稳定碎石排水层的结构形式,对比常规沥青混凝土路面结构,制定符合沥青稳定碎石的松铺系数和碾压工艺。通过施工质量检测,验证配合比、施工工艺以及施工控制要点的合理性。

To reduce the early water damage of asphalt concrete pavement,it is necessary to set the asphalt treated permeable base in the pavement structure and improve the ability of ruling out free water in the internal road.Compared with the foreign porous asphalt mixture gradation,the graduation range which is suitable for China engineering is determined,and the engineering graduation of asphalt treated permeable based on the Hua-Xin Expressway is designed.By figuring out the mine material surface area and oil film thickness to estimate the asphalt-aggregate ratio,combined with the leak test analysis and using Marshall stability test,pore ratio,bulk volume density,the optimal asphalt-aggregate ratio is eventually determined.The target and construction proportion of asphalt treated permeable are determined by the analysis of its properties and combination of the engineering practice.According to the type of asphalt treated permeable and comparison with the conventional structure of the asphalt concrete pavement,loose paving coefficient and compaction technology which fit asphalt treated permeable are formulated.The rationality of mix proportion,construction technology and the key point of construction control are verified by the construction quality examination.