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煤直接液化残渣改性沥青低温性能的改进
季节1,2,苑志凯1,魏建明3,索智1,2,许鹰1,2,李辉1,石越峰4
(1.北京建筑大学土木与交通工程学院,北京 100044;2.北京未来城市设计高精尖创新中心,北京 100044;3.北京低碳清洁能源研究所,北京 102211;4.中国铁道科学研究院集团有限公司铁道建筑研究所,北京 100081)
摘要:
为改善煤直接液化残渣(DCLR)改性沥青的低温性能,利用苯乙烯-丁二烯-苯乙烯嵌段共聚物(SBS)、橡胶粉、3种增塑剂(马来酸二辛酯(DOM)、邻苯二甲酸二辛酯(DOP)和水性丙烯酸树脂(WAR))等方法对DCLR改性沥青进行二次复合改性,并进行5 ℃延度、弯曲梁流变(BBR)以及电镜扫描试验。结果表明:采用SBS(掺量(质量分数)低于3%)或橡胶粉(掺量低于15%)单一改性剂可以改善DCLR改性沥青的低温性能,如果SBS或橡胶粉掺量过高,反而起不到改善作用;采用复合改性剂(SBS和橡胶粉)对DCLR改性沥青的低温性能改善效果较好,其中采用2% SBS和15%橡胶粉复合改性剂时,DCLR改性沥青的性能基本上能满足SBS改性沥青I-D的技术要求,较单一改性剂对DCLR改性沥青低温性能改善提升约1倍;3种增塑剂中WAR对DCLR改性沥青的低温改善效果最差,DOP次之,DOM最好,其中3% DOM对DCLR改性沥青二次复合改性后的性能也能满足SBS改性沥青I-D的技术要求;3% DOM对DCLR改性沥青二次复合改性的制备工艺相对于复合改性剂(2% SBS和15%橡胶粉)操作简单,推荐利用3% DOM来提高DCLR改性沥青的低温性能。
关键词:  煤直接液化残渣  改性沥青  低温性能  苯乙烯-丁二烯-苯乙烯嵌段共聚物  橡胶粉  增塑剂  复合改性
DOI:10.3969/j.issn.1673-5005.2019.04.020
分类号::U 414
文献标识码:A
基金项目:国家自然科学基金项目(51478028,51778038);长江学者和创新团队发展计划项目(IRT-17R06)
Improvements of low-temperature properties of direct coal liquefaction residue modified asphalt
JI Jie1,2, YUAN Zhikai1, WEI Jianming3, SUO Zhi1,2, XU Ying1,2, LI Hui1, SHI Yuefeng4
(1.School of Civil Engineering and Transportation in Beijing University of Civil Engineering and Architecture, Beijing 100044, China;2.Beijing Advanced Innovation Center for Future Urban Design, Beijing 100044, China;3.National Institute of Clean-and-Low-Carbon Energy, Beijing 102211, China;4.Railway Engineering Research Institute, China Academy of Railway Sciences Company Limited, Beijing 100081, China)
Abstract:
In order to improve the low-temperature properties of direct coal liquefaction residue (DCLR) modified asphalt, several different modifiers, such as SBS, rubber powder and three plasticizers (dioctyl maleate (DOM), dioctyl phthalate (DOP) and waterborne acrylic resin(WAR)) were used to enhance the properties of DCLR modified asphalt. The ductility at 5℃, bending beam rheometer (BBR) and scanning electron microscope tests were performed. The results show that the single modifier (SBS content is less than 3% or rubber powder content is less than 15%) has good effect on the low-temperature properties of DCLR modified asphalt. If the content of SBS or rubber powder is too high, it will have no improvement. The compound modifier, including SBS and rubber powder, present good effect on the low-temperature properties of DCLR modified asphalt. When the SBS content is 2% and the rubber powder is 15%, the modification effect is the best and the low-temperature properties of DCLR modified asphalt can basically meet the technical requirements of SBS modified asphalt I-D. Compared with the single modifier, the low-temperature properties of DCLR modified asphalt are improved one time. Among the three plasticizers, the effect of WAR on low-temperature properties of DCLR modified asphalt is the lowest, followed by DOP. And DOM is the highest. The low-temperature properties of DCLR modified asphalt with 3% DOM can satisfy the technical requirements of SBS modified asphalt I-D. Compared with compound modifier (the SBS content is 2% and the rubber powder is 15%), the preparation of DOM is more simple. In a comprehensive comparison, it is recommended that 3% DOM is the most suitable way to improve the low-temperature properties of DCLR modified asphalt.
Key words:  direct coal liquefaction residue  modified asphalt  low-temperature properties  SBS  rubber powder  plasticizer  compound modification
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