中文摘要：

针对5℃延度指标在评价橡胶沥青低温性能上的局限性,为找寻能更好评价橡胶沥青低温性能的评价指标,通过BBR试验,对试验室制备的薄膜老化和压力老化橡胶沥青低温评价指标展开研究,分析基于BBR试验获取的劲度模量、劲度模量变化率、PG分级温度、低温连续分级温度、k指标及综合考虑沥青模量和松弛能力的评价指标SA等橡胶沥青低温评价指标.试验结果表明：随着橡胶粉的加入,沥青的低温抗裂性能显著提高,单一的S或m指标评价橡胶沥青低温性能存在一定片面性,兼顾考虑沥青模量和松弛能力的CT、k及SA指标能更加准确地反映和评价橡胶沥青的低温性能.通过与橡胶沥青混合料低温弯曲应变能密度指标进行相关性分析及综合比选,得出结论：在工程上优先推荐采用k、CT指标作为橡胶沥青低温性能的评价指标;进行研究工作时优先考虑SA指标作为橡胶沥青低温性能的评价指标.

英文摘要：

Aiming at the limitations of 5 ℃ ductility on evaluating the low-temperature properties,in order to find an index to evaluate the low-temperature properties of rubber asphalt more accurately,based on the bending beam rheometer test,the research on the low-temperature evaluation indexes of TFOT-aged and PAV-aged rubber asphalt which processed in the laboratory were carried out. The analysis was made on the low-temperature evaluation indexes of rubber asphalt based on the bending beam rheometer such as stiffness modulus,the rate of stiffness modulus,performance grade temperature,continuous grade temperature,k value and the SAindex which take asphalt modulus and relaxation capacity into consideration. Test results showed that,with the rubber powder adding into asphalt,its low temperature crack resistance improved significantly,one-sidedness was existed to evaluate the low-temperature properties of rubber asphalt by a single S index or a single m index; indexes which take asphalt modulus and relaxation capacity into consideration including CTindex and k index and SAindex were better applied to evaluate the low-temperature properties of rubber asphalt. By doing correlation analysis between these lowtemperature evaluation indexes of rubber asphalt with the bending strain energy density of rubber asphalt mixture and by doing comprehensive comparison,conclusions were made as follows,on the substantial projects we gave priority to recommend k value and CTindex as the low-temperature evaluation indexes,while undertaking research work,we gave priority to recommend SAindex as the low-temperature evaluation index of rubber asphalt.