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

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