Effect of KSHD Warm Additives on Aging Kinetics Characteristics of Xinjiang Rock-modified Asphalt
YU Jiang 1, CHENG Long1, LI Linping1, YE Fen2, SONG Qingqing2
1 Civil Construction College of Xinjiang University, Urumqi 830047; 2 Key Laboratory of Road and Traffic Engineering of Ministry of Education, Tongji University, Shanghai 201804
Abstract: In order to investigate the effect of KSHD warm additives on the aging kinetics characteristics of Xinjiang rock-mo-dified asphalt(XRA). Short-term aging and Brookfield viscosity of the modified asphalt and asphalt composite asphalt were tested. The changing law of Brookfield viscosity about XRA and warm-rock-asphalt composite modified asphalts were explored at different aging temperatures and time. The corresponding kinetics parameters were obtained for both aging reaction rate constants and reaction activation energies. By taking Brookfield viscosity of asphalt as the parameter to establish aging kinetics models. It is found that influence of Brookfield viscosity by aging time and temperatures about warm-rock-asphalt composite modified asphalt (WRA) is minor than that of XRA. When the aging temperatures exceed 163 ℃ or the aging time is more than 10 h, and the increments of the Brookfield viscosity of asphalts from the constant-rate growth into the fast-rate period. The aging kinetics equations can be optimized by analyzing fast-rate period and constant-rate period, respectively. The average error of Brookfield viscosity about the test results and predicted values is less than 5% that after kinetics models was optimized, and the change of the Brookfield viscosity value of asphalts aging procedure can be accurately predicted.
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2018, Vol. 32 
