Preparation and Dynamic Mechanical Properties of High-Modulus Asphalt Modified by Waste Rubber
XIN Xue1, SU Linping1, LIANG Ming1, YAO Zhanyong1, FAN Weiyu2, NAN Guozhi2, ZHANG Jizhe1
1 School of Qilu Transportation, Shandong University, Jinan 250002, China 2 State Key Laboratory of Heavy Oil Processing, China University of Petroleum(East China), Qingdao 266580, China
Abstract: With de-oiled asphalt (DOA) as the main raw material, waste rubber powder of different particle size and contents was added respectively to prepare high-modulus asphalt. Conventional properties analysis, dynamic mechanical analysis and fluorescence microscopy were performed for the products. Results show that rubber powder is not completely compatible with the asphalt but dispersed in the asphalt in the form of dispersed phase existing in the asphalt in the form of strip or rod. With the increase of rubber amounts, softening point increases gradually and the high-temperature performance is obviously improved. It is caused by the swelling of waste rubber powder after absorbing the light part of asphalt and the increase of asphaltene content. At the same temperature, G*, G′ and G″ all showed an obvious upward trend with the increase of waste rubber content, indicating more obvious of improvement effect and more favorable rutting resistance of high-modulus asphalt with the higher the waste rubber powder content. By fitting the relationship between G*/sinδ and temperature under different waste rubber amount, the high tempe-rature grade of high-modulus asphalt increases by 1.66℃ for every 1wt% increase of waste rubber.
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2020, Vol. 34 
