热再生沥青路面抗裂性能综合评价方法研究

Study on Comprehensive Evaluation Method of Crack Resistance of Hot Recycled Asphalt Pavement

为了更好的评价热再生沥青路面的抗裂性能,采用半圆弯曲试验和直接拉伸试验分别评价热再生沥青混合料和再生沥青砂浆的抗裂性能,分析了不同抗裂指标的关联性,多尺度提出热再生沥青路面的抗裂性能。结果表明:再生沥青砂浆的断裂能与再生沥青混合料的20℃的断裂功和断裂能归一化值之间存在很高的一致性,说明再生沥青砂浆的断裂能可有效预测再生沥青混合料的抗断裂性能。

In order to better evaluate the crack resistance of hot recycled asphalt pavement,semi-circular bending test and direct tensile test were used to evaluate the crack resistance of hot recycled asphalt mixture and recycled asphalt mortar respectively.The correlation of different crack resistance indexes was analyzed,and the crack resistance of hot recycled asphalt pavement was proposed at multiple scales.The results show that there is a high consistency between the fracture energy of recycled asphalt mortar and the fracture work and fracture energy normalization value of recycled asphalt mixture at 20°C,which indicates that the fracture energy of recycled asphalt mortar can effectively predict the fracture resistance of recycled asphalt mixture.