Asphalt pavement is easy to be aged with low annual average temperature and strong ultraviolet radiation in western plateau area, so that a series of pavement diseases are produced.Three modifiers nano-TiO2, MMT and SBR are selected to prepare composite modified asphalt.In order to determine the appropriate content of the modifiers, the modi-fied effect of three modifiers is analyzed by response surface methodology with three index tests.The anti-aging performance of modified asphalt with different nano-TiO2 and MMT content is evaluated by dynamics hear rheological test and low temperature bending beam test, and the optimum content of the modifiers based on the anti-aging performance of as-p halt is obtained.The influence factors of modifiers on three major indicators are ranked, i.
e.penetration and ductility:SBR>nano-TiO>nano-MMT,softeningpoint:nano-MMT
>nano-TiO2>SBR, and the opti num content of modifiers is 4%SBR+1.5%nano-
TiO2+4%nano-MMT through prediction formula.The optimum content of nano-TiO2
and MMT is almost the same as that of the model, which are 1%and 4%respectively.Un-
der the optimum content of nano-TiO2 and MMT, the anti-aging performance of the base
asphalt can be improved by 60%and 30%respectively.
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刘朝晖,廖美捷,柳力,等.纳米TiO2/纳米MMT/SBR复合改性沥青掺量研究[J].长沙理工大学学报(自然科学版),2019,16(4):1-7. LIU Zhao-hui, LIAO Mei-jie, LIU Li, et al. Analysis on content of nano-TiO2/nano-MMT/SBRcomposite modified asphalt[J]. Journal of Changsha University of Science & Technology (Natural Science),2019,16(4):1-7.