为评价高模量沥青的低温抗裂性能,选取弯曲蠕变劲度试验、单边切口弯曲梁试验,比较了蠕变劲度、断裂韧度、断裂能等指标的适用性.结果表明:不同种类高模量沥青的断裂韧度存在较大差异,采用蠕变劲度则无法准确评价其低温抗裂性能;沥青的断裂能排序与沥青混合料的临界弯曲应变能排序一致,因此断裂能适宜作为高模量沥青低温抗裂性能的评价指标.鉴于不同种类高模量沥青的低温抗裂性能差异显著,建议通过沥青试验、沥青混合料试验对其低温抗裂性能进行综合评价,以保证高模量沥青材料的应用效果.%The bending beam rheometer test and the single-edge notch bending test were performed and the applicability of the indicators including creep stiffness,fracture toughness and fracture energy to evaluate the low temperature cracking resistance of high modulus asphalt binders(HMABs) was compared.The results show that the creep stiffness cannot be used to evaluate low temperature cracking resistance of HMABs due to the significant differences in the fracture toughness of different types of HMABs.The fracture energy ranking of asphalt binders is consistent with that of the critical curvature strain energy of asphalt mixtures.The fracture energy is suitable for low temperature cracking resistance evaluation of HMABs.As there are significant differences in low temperature cracking resistance of different types of HMABs,both the asphalt binder test and the asphalt mixture test are suggested to evaluate the low temperature cracking resistance of HMABs to ensure the feasibility of their application.
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