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针对低温延度能否准确评价改性沥青的低温开裂性能一直存在质疑的现状,选取应力吸收层复合改性沥青、科氏沥青和2种普通改性沥青进行了测力延度试验,并通过小梁低温弯曲试验,测试混合料低温性能;运用灰色关联分析法,对测力延度参数拉伸荷载变化比、拉伸柔度、韧粘比、延度进行灰关联相关性分析,结果表明:沥青结合料的韧粘比和拉伸柔度对混合料的低温弯曲应变能密度有显著影响,宜采用测力延度的韧粘比和拉伸柔度参数评价应力吸收层沥青结合料的低温性能。
According to the low temperature ductility can accurately evaluate the low-temperature cracking properties of modified asphalt has been questioned the status quo, select the stress-absorbing layer of composite modified asphalt, Coriat asphalt and two kinds of ordinary modified asphalt were tested by force-ductility, and through Trabecular the low temperature bending test to test the low temperature properties of the mixture; using gray correlation analysis method, the load-elongation ratio, tensile flexibility, toughness and viscidity ratio, ductility gray correlation analysis, the results show : The tenacity-to-viscosity ratio and tensile compliance of asphalt binder have a significant effect on the low-temperature bending strain energy density of the mixture, and the tenacity-to-viscosity ratio and tensile compliance of load- Low temperature performance.