期刊
CONSTRUCTION AND BUILDING MATERIALS
卷 271, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.conbuildmat.2020.121870
关键词
Styrene-butadiene rubber modified asphalt; Short-term aging; Warm mix asphalt; Sasobit/ESO composite; Low-temperature performance
资金
- National Natural Science Foundation of China [52078209]
- Huxiang Youth Talent Program of Hunan Province [2019RS2052]
- Transportation Science and Technology Development and Innovation Project of Hunan Province [201805]
- Science and Technology Planning Project of Hunan Province [2019XF5036, 2019GK5004]
By adding Sasobit, ESO, and Sasobit/ESO composite to reduce the preparation temperatures of SBRMA mixture, it was found that the Sasobit/ESO composite not only has better lowering effects on temperatures, but also enhances the high- and low-temperature performance of SBRMA, mitigating the adverse impacts of aging on its performance.
Styrene-butadiene rubber modified asphalt (SBRMA) possesses the excellent low-temperature performance. Nevertheless, SBR copolymer is vulnerable to being decomposed when exposed to high-temperature and oxygen-rich environment during asphalt mixture mixing and compaction processes, which seriously compromises the improving effects of styrene-butadiene rubber (SBR) on thermal cracking resistance of asphalt binder. Therefore, reducing preparation temperatures of SBRMA mixture is a preferable way which can effectively enhance the performance of short-term aged SBRMA. In this research, in order to reduce the temperature during SBRMA mixture fabrication, three additives including Sasobit, epoxidized soybean oil (ESO) and Sasobit/ESO composite were chosen, and the effects of additives on physical, rheological properties of SBRMA, the chemical interactions between SBRMA and additives and their mixture preparation temperatures were evaluated. In addition, the effects of reduced short-term aging temperature by additives on performance of SBRMA and its mixture were investigated through physical, rheological, morphological and mechanical analyses. The results indicate that compared with Sasobit and ESO, Sasobit/ESO composite not only shows the better lowering effect on mixture preparation temperatures, but also can compensate for the adverse effects when Sasobit or ESO is added separately and enhance the high- and low-temperature performance of SBRMA concurrently. The reduced short-term aging temperature by Sasobit/ESO is beneficial to mitigating the adverse impacts of aging on performance of SBRMA. Moreover, adding Sasobit/ESO composite can enhance the thermal cracking resistance of SBRMA mixture. (C) 2020 Elsevier Ltd. All rights reserved.
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