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通过对钢桥面铺装防水保护层沥青混合料的防水性能影响系数进行分析,得出密级配沥青混合料随着公称粒径增大渗水系数也随着增大;但是,空隙率与渗水系数的相关关系并不明显;除了SMA10,其他密级配沥青混凝土都没有不渗水的空隙率门槛值。另外还将浇筑式沥青混凝土与密级配沥青混凝土的渗水系数进行了对比,发现浇筑式沥青混凝土的防水性能明显好于后者。最终根据试验结果提出,浇筑式沥青混凝土是作为钢桥面铺装的首选防水保护层;在条件不具备的情况下,可以选择SMA10作为备选防水保护层。
By analyzing the influence coefficient of waterproof performance of asphalt mixture on the waterproofing protection layer of steel bridge pavement, the result shows that the permeability coefficient of dense grade asphalt mixture increases with the increase of nominal particle size; however, the porosity and water seepage coefficient The correlation is not obvious; except SMA10, there are no impermeable porosity thresholds for other dense graded asphalt concrete. In addition, compared with seepage coefficient of pouring asphalt concrete and dense graded asphalt concrete, the waterproofing performance of pouring asphalt concrete is obviously better than the latter. Finally, according to the test results, it is suggested that pouring asphalt concrete is the preferred waterproof protective layer for pavement of steel bridge deck. SMA10 can be chosen as the optional waterproof protective layer in case of lack of conditions.