钢纤维沥青混合料路面性能及应用研究

为防止低温地区沥青路面的开裂和提高沥青路面疲劳寿命,通过室内试验研究了钢纤维沥青混合料的物理力学性能,包括钢纤维沥青混合料的马歇尔稳定度、动稳定度、常温、低温劈裂强度、纤维防腐方法等,分析了钢纤维对沥青混合料性能影响的机理。通过试验路研究了钢纤维沥青路面的现场拌和施工工艺和使用效果,研究结果表明:沥青混合料中加入钢纤维可使低温劈裂强度明显提高,开裂时的变形显著增大,从而改善沥青路面的低温抗裂性能,同时钢纤维对常温条件下沥青混合料的抗拉强度和高温抗车辙性能有一定改善,钢纤维沥青路面的施工工艺与普通沥青混凝土路面相同,可以利用沥青对钢纤维直接防腐而不需要作其它防腐处理。成果对低温地区和重载交通公路沥青路面材料选择有重要参考应用价值。

Properties of Steel Fiber Asphalt Concrete and Its Application

To prevent asphalt pavement from cracking under low temperatures and prolong its fatigue life,we tested the properties of a new type of steel fiber asphalt pavement.The tests evaluated Marshall stability,dynamic ruts,and cleavage strength under both low and normal temperature conditions.We also analyzed the anti-corrosion property of steel fiber and the factors affecting the properties of the steel fiber asphalt mixture.The steel fiber asphalt pavement was installed on a highway in Chongqing,P.R.China to investigate the construction art of the steel fiber asphalt mixture and examine its effect in field use.The test results and concrete use in the field show that the cleavage strength and flexibility of steel fiber asphalt concrete increase due to the action of steel fiber.We conclude that the anti-cracking capacity of asphalt pavement under low temperature conditions can be improved by steel fiber.The construction art of steel fiber asphalt pavement is the same as common asphalt pavement without the necessity of anti-corrosion processing for steel fiber.The research results are useful for pavement material selection in low temperature regions and heavy traffic road pavement designs.