Abstract: To optimize the low temperature performance evaluation indexes of calcium sulfate whisker (CSW) modified asphalt, the correlation of 10 ℃ ductility, equivalent brittle point T1.2, 15 ℃ cone penetration and cone penetration index (CI) of CSW modified asphalt with -12 ℃bending creep stiffness test index (S) and stress relaxation rate (m) were analyzed by using grey correlation theory. The results indicate that it is feasible to use grey correlation theory to optimize the evaluation indexes of the low temperature performance of CSW modified asphalt. Among them, the correlation between the equivalent brittle point T1.2 and the stiffness modulus and m-value is the largest, followed by 10℃ ductility and cone penetration index (CI). The research results of influencing factors on the low temperature performance of CSW modified asphalt show that the low temperature performance of asphalt is reduced to some extent after the incorporation of CSW, and CSW types have significantly larger influence on the low temperature performance of asphalt than CSW contents do.

Key words: highway engineering, calcium sulfate whisker (CSW) modified asphalt, grey correlation method, low temperature performance, evaluation indexes, influencing factors

摘要： 为优化硫酸钙晶须(CSW)改性沥青的低温性能评价指标，采用灰色关联方法计算分析了10 ℃延度、当量脆点T1.2、15 ℃锥入度、锥入度指数CI等指标与-12 ℃弯曲蠕变劲度试验指标S和m的关联度。结果表明：采用灰色关联方法优化比选CSW改性沥青低温性能评价指标是可行的，其中当量脆点T1.2与劲度模量S和应力松弛速率m的关联度最大，10 ℃延度和锥入度指数CI次之。CSW改性沥青低温性能影响因素研究结果表明：CSW掺入沥青后一定程度上降低了沥青的低温性能，且CSW类型对沥青低温性能影响程度比其掺量显著。

关键词: 道路工程, 硫酸钙晶须改性沥青, 灰色关联方法, 低温性能, 评价指标, 影响因素