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环氧沥青固化反应机理及施工控制性能研究
Study of Curing Reaction Mechanism and Construction Control Performance of Epoxy Asphalt
投稿时间:2019-09-21  修订日期:2020-05-03
DOI:103969/j.issn.1007 9629202004029
中文关键词:  环氧沥青  微观形貌  固化反应  热塑性热固性  施工控制
英文关键词:epoxy asphalt  micromorphology  curing reaction  thermoplastic thermosetting  construction control  performance comparison
基金项目:国家科技支撑计划项目(2011BAG07B03);佛山市科技创新项目(2018AB003841)
              
作者单位
黄红明
HUANG Hongming
长沙理工大学交通运输工程学院,湖南长沙410004
School of Traffic and Transportation Engineering, Changsha University of Science & Technology, Changsha 410004, China
曾国东
ZENG Guodong
佛山市交通科技有限公司,广东佛山528041
Foshan Transportation Science and Technology Co., Ltd., Foshan 528041, China
徐伟
XU Wei
华南理工大学土木与交通学院,广东广州510641
School of Civil Engineering and Transportation, South China University of Technology, Guangzhou 510641, China
李水金
LI Shuijin
珠海情侣海岸建设有限公司,广东珠海519000
Zhuhai Couple Coast Construction Co., Ltd., Zhuhai 519000, China
周志刚
ZHOU Zhigang
长沙理工大学交通运输工程学院,湖南长沙410004
School of Traffic and Transportation Engineering, Changsha University of Science & Technology, Changsha 410004, China
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中文摘要:
      采用扫描电子显微镜和荧光显微镜观察环氧沥青(NEA)的微观形貌,探索分析NEA的固化反应特性及热塑性热固性转变机理,研究最佳混合树脂(环氧树脂与固化剂的混合物)掺量NEA混合料的容留温度、容留时间和强度发展规律等施工控制性能.结果表明:37%混合树脂掺量为NEA热塑性热固性转变临界点;38%混合树脂掺量NEA形成交联网络结构,环氧树脂为连续相,表现为热固性;50%混合树脂掺量NEA形成均匀、密实的三维交联网络结构,沥青在环氧树脂中起增韧作用;NEA混合料的容留温度和容留时间控制范围较宽,在165~185℃容留温度下最长容留时间可达30h;NEA混合料具有较高的弯拉模量和变形性能,175℃容留温度下综合性能较佳;在NEA混合料未完全固化前,40℃下养生4d,其马歇尔稳定度高于50kN,达到开放交通的强度要求.
英文摘要:
      Scanning electron microscopy and fluorescence microscopy were applied to observe the micromorphology of new epoxy asphalt N EA with a view to analyze the curing reaction and transition mechanism between thermoplasticity and thermoset of N EA. Through this method, the construction control performance of N EA epoxy asphalt was investigated under the best mixed resin dosage condition, such as mixing holding temperature, construction control time, strength development, etc. The results showed that 37% mixed resin is the inversion amount of N EA changed from thermoplastic to thermoset of epoxy asphalt. N EA with 38% mixed resin will form cross linked network structure, epoxy resin is the continuous phase, and exhibits thermosetting properties. N EA with 50% mixed resin has formed a well distributed and dense three dimensional cross linked network structure, in which asphalt plays a good toughening role. N EA mixture exists in wide range in construction temperature and time control. The longest reserved time of the mixture was 3h at the reserved temperature of 165185℃. The mixture possesses high bending elasticity modulus and deformation performance and it has better combination property at 175℃. Before the mixture is fully solidified, the temperature and time of health maintenance are the key factors of its strength growth, the mixture is maintained at 40℃ for 4days and its Marshall stability is higher than 50kN, to meet the requirements of open traffic.
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