赤泥基地聚物改性乳化沥青冷再生混合料的路用性能研究

Road Performance of Emulsified Asphalt Cold Recycled Mixture with Red Mud Based Geopolymer

为延长道路使用寿命,改善乳化沥青冷再生混合料的路用性能,促进固废资源再生利用,采用赤泥基地聚物作为改性剂,从原材料、地聚物配比、掺量等方面确定了改性剂在冷再生混合料中的最佳掺量,并通过浸水马歇尔试验、车辙试验、小梁弯曲试验、单轴贯入试验综合评价了赤泥基地聚物改性乳化沥青冷再生混合料的路用性能。结果表明:赤泥基地聚物的最佳摩尔比为1.4,在乳化沥青冷再生混合料中的最佳掺量为1.5%。改性后,混合料的抗水损性能提升了7%,高温抗车辙性能提升了42.5%,抗剪切性能增强,但对低温抗开裂性能有损伤,较适用于高温重载地区。

To prolong the service life of roads,improve the road performance of emulsified asphalt cold recycled mixtures,and promote the recycling and utilization of solid waste resources,this paper used the red mud geopolymer as a modifier and determined its optimum dosage in the cold recycled mixture by considering raw material,geopolymer ratio,and dosage.The road performance of the emulsified asphalt cold recycled mixture with the red mud based geopolymer was comprehensively evaluated via the immersion Marshall test,rutting test,beam bending test,and uniaxial penetration test.The results showed that the red mud based geopolymer′s optimum molar ratio was 1.4 and the optimum dosage in the emulsified asphalt cold recycled mixture was 1.5%.After the modification of the mixture,the water damage resistance was improved by 7%,the high-temperature rutting resistance was improved by 42.5%,and the shear resistance was enhanced,however,there was damage to low-temperature crack resistance,indicating that the modified mixture was more suitable for areas with high temperatures and heavy loads.