基于灰关联分析的环氧沥青混合料抗弯拉性能研究

通过对沥青混合料开裂机理的分析,采用能综合反映沥青混合料强度和变形特性的弯曲应变能密度临界值作为环氧沥青混合料抗弯拉性能的评价指标.在M TS810材料试验机上进行不同温度条件下环氧沥青混合料的小梁弯曲试验.采用灰色关联分析法分析了不同温度条件下环氧沥青混合料的弯拉强度、临界弯拉应变及弯曲劲度模量等指标与混合料弯曲应变能密度临界值的相关联程度.研究表明,与弯拉强度、临界弯拉应变相比,弯曲应变能密度临界值能较为科学地评价环氧沥青混合料的抗弯拉性能;弯曲劲度模量与应变能密度临界值指标的关联性较差,因此,弯曲劲度模量作为环氧沥青混合料抗弯拉性能评价指标还有待于进一步研究.

Research on Flexural Performance of Epoxy Asphalt Mixture Base on Grey Relation Degree Theory

By the analysis of cracking mechanism,the flexural strain energy density is adopted to evaluate the flexural performance of epoxy asphalt mixture.The three point bending test is conducted at different temperature using MTS810.Relation degree between each factor and flexural strain energy density is analyzed by the grey relation degree theory.The results show that the index of flexural strain energy density is more effective to evaluate the flexural performance of epoxy asphalt mixture than other indexes.And more research effort should be made to determine whether the bending stiffness is suitable to evaluate the flexural performance of epoxy asphalt mixture due to the worse relation degree between the bending stiffness and the flexural strain energy density.