论文部分内容阅读
利用动态剪切流变仪(DSR)和弯曲梁流变仪(BBR)对冻融循环前后的三种沥青(沥青、苯乙烯-丁二烯-苯乙烯嵌段共聚物(SBS)改性沥青、胶粉改性沥青)进行测试,比较分析不同冰冻温度、融雪盐浓度、冻融循环次数下三种沥青的高低温性能变化规律,并对环境因素进行灰熵分析。结果表明:在盐冻循环条件下对沥青复合模量G*影响最大的因素是融雪盐溶液浓度,其次是10℃延度;对沥青相位角δ影响最大的因素是软化点,其次是25℃针入度;对沥青蠕变劲度模量S影响最大的因素是融雪盐溶液浓度,其次是10℃延度;对沥青蠕变速率m影响最大的因素是试验温度,其次是冰冻温度。
Three kinds of asphalt (asphalt, styrene-butadiene-styrene block copolymer (SBS) modified asphalt) before and after the freeze-thaw cycle were analyzed by dynamic shear rheometer (DSR) and bending beam rheometer , Rubber modified asphalt) were tested. The variation of high and low temperature properties of three kinds of asphalt under different freezing temperature, melting salt concentration and freeze-thaw cycles were compared. Gray entropy analysis of environmental factors was also conducted. The results show that the most influential factor on asphalt composite modulus G * is the concentration of salt solution in salt solution, followed by 10 ℃ ductility, the softening point is the most important factor affecting the asphalt phase angle δ, followed by 25 ℃ Penetration degree. The most influential factor on creep stiffness modulus S is the concentration of salt solution, followed by 10 ℃ ductility. The most influential factor on asphalt creep rate m is the test temperature, followed by the freezing temperature.