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研究了钢渣细集料沥青混凝土及膨胀性能,含细集料(粒径小于5mm)的钢渣沥青混凝土长期在水作用下膨胀效应明显,粒径小于10mm的钢渣集料对沥青吸收效果明显。采用逐级等体积替换的方法配制了钢渣AC-25沥青混合料,研究了集料复合方式、设计方法和工艺对AC-25钢渣沥青混合料最佳油石比的影响;集料复合技术可有效降低钢渣沥青混凝土最佳沥青用量,采用粒径大于10mm的钢渣与粒径小于10mm的玄武岩复合可最大限度使用钢渣集料同时有效控制油石比;Superpave设计方法与马歇尔设计方法在确定钢渣沥青混凝土最佳沥青用量上差别不大,即不同设计方法对降低钢渣沥青混凝土的油石比效果不明显;将沥青与填料提前制备成胶浆再与钢渣集料拌合制备沥青混凝土的方法可减少自由沥青的量,约降低沥青用量0.2%。
Steel slag asphalt concrete with fine aggregate (particle size less than 5 mm) has obvious expansion effect under water for a long time. Steel slag aggregate with particle size less than 10 mm has obvious absorption effect on asphalt. The slag AC-25 bituminous mixture was prepared by step by step equal volume replacement. The effect of the compounding method, design method and process on the optimal ratio of asphalt to asphalt of AC-25 steel slag was studied. Reduce the optimal asphalt content of steel slag asphalt concrete, the use of steel slag particles larger than 10mm and particle size less than 10mm basalt composite can maximize the use of steel slag aggregate while effectively controlling the ratio of oil to stone; Superpave design method and Marshall design method in the determination of steel slag asphalt concrete The amount of good asphalt is not very different, that is, different design methods to reduce the asphalt concrete asphalt stone effect is not obvious; the asphalt and filler prepared in advance and then mixed with the slag aggregate prepared asphalt concrete can reduce the free asphalt Reduce the amount of asphalt by about 0.2%.