涂覆时间对聚合物水泥基钢筋涂层粘接性能的影响机理  

Mechanism of Resting Time on Bond Performance of Polymer Cement-based Coating on Steel Bar

作　　者：胡家宇 徐菲 钱文勋 肖怀前 葛津宇 李嘉明 HU Jiayu;XU Fei;QIAN Wenxun;XIAO Huaiqian;GE Jinyu;LI Jiaming(Materials&Structural Engineering Department,Nanjing Hydraulic Research Institute,Nanjing 210029,China;Jiangsu Water Conservancy Construction Engineering Co.,Ltd.,Yangzhou 225000,Jiangsu,China;Jiangsu Huaishuxin River Administration Bureau,Huai’an 223001,Jiangsu,China)

机构地区：[1]南京水利科学研究院材料结构研究所,南京210029 [2]江苏省水利建设工程有限公司,江苏扬州225000 [3]江苏省淮沭新河管理处,江苏淮安223001

出　　处：《材料导报》2024年第17期123-126,共4页Materials Reports

基　　金：国家重点研发计划(2021YFB2600704);国家自然科学基金(52109161);新沂河海口枢纽水利科技项目(HKZJG-KY-01)。

摘　　要：为探明由涂层胶凝进程引发的界面过渡区(ITZ)物相经时演变对聚合物水泥基涂层与混凝土保护层间粘接性能的影响机理,制备丙乳与P·O 52.5水泥质量比1∶2的涂层,测试不同涂覆时间下钢筋的握裹力,分析了钢筋涂层与保护层ITZ组成物相的微观形貌及经时演化特征。研究表明:不超过3 h的涂覆时间有利于聚合物水泥基涂层与保护层ITZ中水化硅酸钙(CSH)凝胶的聚合,进而提高钢筋的粘接性能。To investigate the influence mechanism of the phase evolution of interfacial transition zone(ITZ)caused by the coating gelation process on the bonding properties of polymer-cement based coating and concrete protective layer,a coating with a mass ratio of 1∶2 between acrylate emulsion and P·O 52.5 cement was prepared,and the bonding strength of coated steel bar under different cementing time was tested.The microstructure and time-evolution characteristics of the ITZ components in reinforcement coating and protective coating were characterized.The results show that shorter resting time(<3 h)is beneficial to the polymerization of polymer-cement based coating and calcium silicate hydrate(CSH)between the ITZ,and then improve the bonding properties of coated steel bars.

关 键 词：聚合物水泥基涂层 界面过渡区 钢筋握裹力 CSH凝胶 微观分析 

分 类 号：TB37[一般工业技术—材料科学与工程]