【摘要】 通过对沥青混合料低温开裂机理的分析 ,以弯曲应变能密度临界值为指标 ,运用灰关联的方法分析沥青混合料的弯拉强度、临界弯拉应变、油石比、表观密度及所用沥青的针入度等指标对混合料低温抗裂性能的影响程度。研究表明 ,由于沥青混合料的应变能密度临界值指标是混合料临界弯拉应变和弯拉强度 2个指标的综合 ,用它来评价沥青混合料的低温抗裂性能更加科学 ;低温时沥青混合料的允许变形能力较差 ,提高混合料的允许变形能力可明显增强沥青路面的低温抗裂性能更多还原

【Abstract】 Regarding extremer of curvature strain energy density as asphalt?mixtures low?temperature anti?cracking performance index, we can study its effect factors by the grey relation theory Firstly, asphalt mixtures cracking mechanism at low temperature was studied Secondly, many kinds of asphalt mixtures were experimented with the curvature tests using MTS810 at 0℃ Finally, relation degree between each factor and curvature strain energy density was analyzed by grey relation degree method It is shown that the curvature strain energy method is more effective than strain or intensity As for asphalt mixtures anti?cracking performance at low temperature, improving its allowable distortion ability is more important so that asphalt mixtures anti?cracking performance can be promoted obviously更多还原