北美岩沥青改性厂拌热再生混合料试验研究

摘要

Structure and composition was researched by elemental analysis ,scanning electron microsco‐py and infrared spectrum .Mixing process and road performance of central plant hot recycling mixture modified by American gilsonite were researched .The result shows that it’s technically feasible for A‐merican gilsonite to modify central plant hot recycling mixture .The American gilsonite influence law to hot recycling mixture is consistent with the conventional asphalt mixture .High temperature stabili‐ty of hot recycling mixture increase is especially obvious due to common effect of American gilsonite and old asphalt in the reclaimed asphalt pavement(RAP) .Bonding property of asphalt and aggregate is im‐proved with gilsonite softening and heteroatom group adsorption .American gilsonite powder increases asphalt viscosity and mixture film thickness to improve water stability of hot recycling mixture .%采用元素分析、扫描电镜和红外光谱分析了北美岩沥青的结构与组成，并试验研究了北美岩沥青改性厂拌热再生混合料的拌和工艺和路用性能。结果表明，北美岩沥青改性厂拌热再生混合料在技术上可行；北美岩沥青对厂拌热再生混合料影响规律与其对常规沥青混合料影响规律一致；由于岩沥青和回收沥青路面材料（RA P ）中旧沥青的共同作用，热再生混合料高温稳定性能提升明显；岩沥青高温软化和杂原子团吸附作用共同改善了沥青与集料的粘结性能；岩沥青提高沥青黏度，增加了混合料油膜厚度，改善了热再生混合料水稳定性能。