环氧树脂-地聚物复合涂层材料耐海水腐蚀性研究  

Study on Seawater Corrosion Resistance of Epoxy Resin-Geopolymer Composites Coating

作　　者：ZEZE Armande Loraine Phalé 徐红岩 张默 马国伟 ZEZE Armande Loraine Phalé;XU Hongyan;ZHANG Mo;MA Guowei(School of Civil and Transportation Engineering,Hebei University of Technology,Tianjin 300401,China;Smart Infrastructure Research Institute,Tianjin 300401,China;Tianjin Key Laboratory of Prefabricated Building and Intelligent Construction,Tianjin 300401,China)

机构地区：[1]河北工业大学土木与交通学院,天津300401 [2]智慧基础设施研究院,天津300401 [3]天津市装配式建筑与智能建造重点实验室,天津300401

出　　处：《材料导报》2021年第S01期600-606,共7页Materials Reports

基　　金：河北省自然科学基金(E2019202431,E2019202484);河北省青年拔尖人才基金(BJ2020001);河北省引进留学人员资助项目(C20190506)。

摘　　要：地聚物具有优异的耐化学腐蚀性能,但易收缩开裂的缺点限制了其在混凝土保护涂层中的应用。为了提高地聚物的延展性和体积稳定性,本研究合成了环氧树脂-地聚物(EG)复合材料。通过力学试验、海水浸泡试验、线性极化电极试验、扫描电子显微镜和N 2-吸附BJH试验,探讨了EG作为海洋混凝土涂层的可行性,研究了树脂掺量对EG在海水环境中的耐腐蚀性和耐久性的影响。与纯地聚物相比,树脂掺量为20%~30%时,EG在室温养护过程中和湿-干循环后的收缩率均有所降低,且经历海水浸泡56 d后EG的残余强度高于地聚物。对于EG涂层,其与混凝土基材的粘结强度和抗氯离子渗透性随着树脂掺量的增加而提高。经过3轮海水湿-干循环后,树脂掺量为30%的EG涂层试件的线性极化电阻约为未涂层试件的11倍。微观结构表征表明,树脂的加入减小了地聚物主要孔隙尺寸,提高了地聚物的致密性,有助于降低地聚物的收缩率,提高地聚物的耐久性。研究结果表明,EG复合材料作为海工混凝土防腐涂层具有良好的应用潜力。Geopolymer has excellent chemical resistance,whereas the high cracking potential limited its application in concrete protective coating.In the present study,epoxy resin-geopolymer(EG)composites were synthesized to improve the ductility and volumetric stability of geopolymer.To explore the feasibility of EG as marine concrete coating,the influences of resin contents on the corrosion resistance and durability of EG in seawater environment were investigated via physical and mechanical testing,seawater conditioning,linear polarization resistance testing,scanning electron microscopy and N 2-adsorption BJH tests.Compared to pure geopolymer,the shrinkage of EG with 20%—30%of resin during curing and after wet-dry cycling was decreased,with which the residual strength of EG was higher than geopolymer after 56 d seawater soaking.For EG coating,the adhesive strength and chloride corrosion resistance were increased with resin content.The linear polarization resistance of EG coa-ting with 30wt%of epoxy resin was about 11 times of the sample without coating after 3 rounds of seawater wet-dry cyclings.The microstructure characterization indicated that the decreased dominant pore size and embedment of resin improved the compactness and energy adsorption capability of geopolymer,and contributed to the decreased shrinkage and enhanced durability of EG.The findings suggested that EG composite can provide promising alternative as anticorrosion coating in marine environment.

关 键 词：环氧树脂-地聚物 耐久性 耐氯离子渗透性 孔隙率 

分 类 号：TU52[建筑科学—建筑技术科学]