摘要
环氧树脂与混凝土的界面黏结性能是影响纤维增强聚合物加固混凝土结构效果的关键因素之一,而混凝土的碳化作用又会影响环氧树脂与混凝土的界面黏结性能。本文以分子动力学为依托,探究碳化对环氧树脂与混凝土界面黏结性能的影响。结果表明,碳化的存在能提升环氧树脂与混凝土的界面黏结性能,使环氧树脂的分布更加靠近混凝土表面,环氧树脂与基底的相互作用能更高。静态结构分析表明,环氧树脂与混凝土基底主要是以钙氧键和氢键连接,在碳酸钙表面化学键的连接数目更多且化学键强度更高。动态分析发现,水化硅酸钙表面受较少离子对和氢键束缚,环氧树脂能自由移动,不利于强界面黏结性能的产生。
The interfacial bonding performance between epoxy resin and concrete is one of the key factors affecting the effect of fiber-reinforced concrete structures,and the carbonation of concrete affects the interfacial bonding performance between epoxy resin and concrete.The effect of carbonation on the interfacial bonding performance between epoxy resin and concrete was investigated based on molecular dynamics.The research results show that the existence of carbonation can enhance the interfacial bonding performance between epoxy resin and concrete.The distribution of epoxy resin is closer to the concrete surface,and the interaction energy between epoxy resin and the substrate is higher.Static structure analysis shows that epoxy resin and concrete substrate are mainly connected by calcium oxygen bond and hydrogen bond,and the number of chemical bond connections on the calcium carbonate surface is more and the chemical bond strength is higher.Dynamic analysis shows that the surface of calcium silicate hydrate is bound by fewer ion pairs and hydrogen bonds,and epoxy resin can move freely,which is not beneficial to strong interfacial bonding performance.
作者
姜晓丹
孙梦琪
刘昂
王攀
侯东帅
JIANG Xiaodan;SUN Mengqi;LIU Ang;WANG Pan;HOU Dongshuai(School of Civil Engineering,Qingdao University of Technology,Qingdao 266033,China)
出处
《硅酸盐通报》
CAS
北大核心
2023年第4期1291-1297,共7页
Bulletin of the Chinese Ceramic Society
基金
国家自然科学基金(52178221)。
关键词
环氧树脂
界面黏结
碳化
水化硅酸钙
分子模拟
力学性能
epoxy resin
interfacial bonding
carbonation
calcium silicate hydrate
molecular simulation
mechanical property
