摘要
为了有效减少因环氧沥青柔韧性较差而引起的铺装层病害,进一步促进环氧沥青在钢桥面铺装上的推广应用,对环氧沥青的柔韧性问题进行了详细阐述。从环氧树脂、环氧沥青结合料、环氧沥青混凝土3个层面综合分析了国内外改善环氧沥青柔韧性方法的研究进展。结果表明:相较于有机硅改性剂,橡胶颗粒、有机蒙脱土(OMMT)、聚氨酯能大幅改善环氧树脂的柔韧性;固体颗粒对环氧沥青结合料的改性效果良好,但会增加结合料的黏度且容易发生团聚现象,不利于施工;苯乙烯-丁二烯-苯乙烯嵌段共聚物(SBS)在提升环氧沥青结合料柔韧性方面优势不大,但能有效提高环氧沥青结合料的强度、高低温性能;超支化聚酯改性与柔性长链固化剂基本不会增加环氧沥青结合料的黏度,且能大幅提高断裂伸长率,是未来研究的重点方向;对于环氧沥青混凝土,橡胶颗粒能有效提高柔性,而纤维增韧效果较好,但会略微降低柔性,适当掺量的橡胶颗粒、纤维混合添加剂柔韧性改善效果显著,橡胶颗粒和纤维都会增加混合物的黏度,减少容留时间,因而对施工技术要求较高;聚氨酯在改性环氧沥青混凝土上也有少许应用,因成本较高、降低其他路用性能而受到限制。
To effectively reduce the pavement disease caused by poor suppleness of epoxy asphalt,further promote the application of epoxy asphalt on steel bridge deck pavement,the problems of epoxy asphalt suppleness are described in detail.The research progress of improving suppleness of epoxy asphalt is comprehensively analyzed from the levels of epoxy resin,epoxy asphalt binder and epoxy asphalt concrete.The result shows that(1)compared with organosilicon modifiers,rubber particles,organic montmorillonite(OMMT)and polyurethane can greatly improve the suppleness of epoxy resin;(2)the solid particles have a good modification effect on epoxy asphalt binder,but it will increase the viscosity of binder and prone to agglomeration,which is not conducive to construction;(3)styrene-butadiene-styrene(SBS)has little advantage in improving the suppleness of epoxy asphalt binder,but it can effectively improve the strength,high-temperature and low-temperature performance of epoxy asphalt binder;(4)hyperbranched polyester modification and flexible long-chain curing agent will not increase the viscosity of epoxy asphalt binder,and they can greatly increase the elongation at break,which is the focus of future research;(5)rubber particles can effectively improve the flexibility of epoxy asphalt concrete.Fiber has a good toughening effect on epoxy asphalt concrete,but it will slightly reduce the flexibility of epoxy asphalt concrete.Appropriate amount of the mixed additive of rubber particles and fibers has a significant modification effect of suppleness.Rubber particles and fibers will increase the viscosity of the mixture and reduce the holding time,which requires higher construction technology.(6)There are also a few applications of polyurethane in modification of epoxy asphalt concrete,which is limited due to its high cost and reduced road performance.
作者
张恒龙
贺求生
ZHANG Heng-long;HE Qiu-sheng(Key Laboratory for Green&Advanced Civil Engineering Materials and Application Technology of Hunan Province,Hunan University,Changsha Hunan 410082,China;Hunan Provincial Construction Solid Waste Utilization Engineering Technology Research Center,Changsha Hunan 410205,China)
出处
《公路交通科技》
CAS
CSCD
北大核心
2021年第5期52-64,共13页
Journal of Highway and Transportation Research and Development
基金
国家自然科学基金项目(52078209)
湖南省科技人才专项“湖湘青年英才”支持计划项目(2019RS2052)
湖南省科技计划项目(2019XF5036,2019GK5004,2018TP2038)
湖南省交通科技进步与创新计划项目(201805)。
关键词
桥梁工程
柔韧性改善方法
综述
环氧沥青
固体颗粒
纤维
bridge engineering
improving methods of suppleness
review
epoxy asphalt
solid particle
fiber
