To improve the service level of asphalt pavement at low temperature and prolong its service life,the matrix asphalt was modified by environment-friendly plasticizer diisobutyl cyclohexane dicarboxylate(DIBCH),the modified asphalt with different DIBCH content (0,1.5%,2%,2.5%,3%) was prepared by high-speed shear method,and the AC-13C DIBCH modified asphalt mixture was designed by Marshall method.The improvement effect of DIBCH on SK90 asphalt was analyzed by ductility test,penetration test and bending beam rheological test.The low temperature crack resistances of SK90 and modified asphalt mixture were evaluated by low temperature trabecular bending test.The results shown that the ductility and equivalent brittleness of SK90 asphalt increased obviously with the increase of DIBCH content,and the creep stiffness and creep rate of DIBCH modified asphalt were obviously better than those of SK90 asphalt.Through mechanical and energy analysis,DIBCH was helpful to improve the low temperature crack resistance of SK90 asphalt mixture.Based on the analysis of the performance indexes of DIBCH modified asphalt and its mixture,it was concluded that the best content was 3.0%.The grey correlation analysis shown that the creep rate can better evaluate the low temperature performance of DIBCH modified asphalt,and the flexural tensile strength RB can better evaluate the low temperature performance of DIBCH modified asphalt mixture.
Fu Zhen, Shi Ke, Song Ruimeng, Dai Jiasheng, Lin Menglei
. Study on low temperature performance of DIBCH modified asphalt and asphalt mixture[J]. New Chemical Materials, 2020
, 48(12)
: 236
-241
.
DOI: 10.19817/j.cnki.issn 1006-3536.2020.12.055
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