Physical and rheological evaluation of aging behaviors of SBS modified asphalt with thermochromic powders

作者：Li, Lu; Zhang, Henglong^*; Chen, Zihao; Wei, Chuanwen

来源：Construction and Building Materials, 2018, 193: 135-141.

DOI：10.1016/j.conbuildmat.2018.10.197

• SBS modified asphalt
• RIP binder
• Physical properties
• Rheological properties
• Anti-aging performance

Styrene-butadiene-styrene copolymer (SBS) modified asphalt is widely utilized in road construction. However, aging effect on SBS modified asphalt is still a serious problem that needs to be resolved. It has been demonstrated that thermochromic materials can-not only adjust the road surface temperature, but also improve the aging resistance of base asphalt. This paper mainly investigated the effects of different content (0, 2, 4, 6, 8%) of red thermochromic powders (RTP) on the thermal oxidizing aging of SBS modified asphalt. Thin film oven test (TFOT), pressure aging vessel test (PAV) and ultraviolet radiation (UV), were used to simulate thermo-oxidative aging and ultraviolet aging of RTP binders, respectively. Physical and rheological properties of RTP binders before and after three aging methods were discussed. The results displayed that the red thermochromic powders had a slight effect on high-temperature stability of SBS modified asphalt, while the low-temperature performance grade of the SBS modified asphalt could be improved with the introduction of RTP. Aging behaviors of RTP asphalt binder could be effectively prevented in comparison with blank sample, indicating its good aging resistance which is in accordance with changes in physical and rheological properties of the binders before and after aging. In addition, 2% and 4% RTP binders showed superior aging resistance than 6% and 8% RTP binders.

• 出版日期2018-12-30
• 单位湖南大学