不同老化沥青掺量下的温拌再生沥青性能研究

摘要

This paper gives a research about performance properties of warm recycled asphalt binders under different aged asphalt binders percentage using two warm mix additive technologies(wax additive and surfactant additive).The viscosity,DSR(Dynamic Shear Rheometer) and BBR (Bending Bean Rheometer)test of different asphalt binders were tested and the high temperature property,rutting resistance,fatigue resistance and the low temperature performance were analyzed.The result showed that as aged asphalt binders content increase,the viscosity,rutting resistance and the fatigue factor have the liner increase,but the m-value of low temperature performance have a reduction;Compared to the hot mix asphalt binders,the warm recycled mix asphalt binders with wax additive A showed significant decrease of viscosity(20％ ～30％),lower high temperature and rutting resistance performance,better resistance of fatigue and low temperature performance.While the warm recycled mix asphalt binders with surfactant additive B has no significant change in viscosity,high temperature and resistance of rutting,but the resistance of fatigue and low temperature performance have a slightly increase.The rutting resistance and construction temperature increased as aged asphalt binder content increase,but the reduction of fatigue resistance and the low temperature performance were noticed.Moreover,the property of warm mix recycled binders significantly affected by different warm mix additives and the appropriate additive should be selected in practice.%目的 研究在不同温拌剂、不同老化沥青掺量下的温拌再生沥青性能,分析温拌剂和老化沥青对温拌再生沥青的性能影响.方法 对不同温拌再生沥青的旋转黏度、动态剪切流变试验的高温性能及抗疲劳性能、弯曲梁流变试验的低温性能进行分析.结果 随老化沥青掺量的增加,沥青的旋转黏度、车辙因子及疲劳因子升高,低温蠕变速率下降;降黏型温拌再生沥青A与普通再生沥青相比,黏度下降20％～30％,高温性能和抗车辙能力降低,其抗疲劳性能和低温性能均有不同程度的提高;表面活性型温拌再生沥青B与普通再生沥青相比,其黏度、高温性能和抗车辙能力基本不变,抗疲劳性能和低温性能略有提高.结论 老化沥青提高温拌再生沥青施工温度和高温性能,降低其抗疲劳和低温性能.不同温拌剂对再生沥青的性能影响不同,应根据实际需要选择相应温拌剂.