防腐涂装龄期对海工现浇混凝土性能演变的影响  

Effects of Anti-Corrosion Coating/Treating Ages on Performance Evolution of Marine Cast-in-Place Concrete

作　　者：姜金勇 朱海威 钱鑫 杨海成 范从军 JIANG Jinyong;ZHU Haiwei;QIAN Xin;YANG Haicheng;FAN Congjun(Port of Nantong Co.,Ltd.,Nantong 226500,China;Key Laboratory of Construction Material,China Communications Construction,Guangzhou 510230,China;Observation and Research Base of Transport Industry of Long-Term Performances of Marine Infrastructure,Guangzhou 510230,China;Key Laboratory of Harbor&Marine Structure Durability Technology,Guangzhou 510230,China;Rizhao Shihua Crude Oil Terminal Co.,Ltd.,Rizhao 276800,China)

机构地区：[1]南通港口集团有限公司,南通226500 [2]中交集团建筑材料重点实验室,广州510230 [3]海洋基础设施长期性能交通运输行业野外观测研究基地,广州510230 [4]水工构造物耐久性技术交通运输行业重点实验室,广州510230 [5]日照实华原油码头有限公司,日照276800

出　　处：《硅酸盐通报》2024年第10期3615-3622,3644,共9页Bulletin of the Chinese Ceramic Society

基　　金：南通市科学技术局社会民生面上项目(MS12021010);交通运输行业重点科技项目(2021-MS1-002)。

摘　　要：本文基于混凝土室内模拟海洋环境侵蚀试验,通过分析侵蚀后海工现浇混凝土的抗压强度、涂层粘结强度、混凝土中氯离子扩散行为等,研究了防腐涂装龄期对海工现浇混凝土力学性能和耐久性演变的影响规律。结果表明:与无防腐涂装混凝土相比,采用硅烷和聚氨酯涂层的防腐涂装混凝土经海洋潮汐区侵蚀后抗压强度f_(c)下降,且随养护龄期t_(c)增长,混凝土f_(c)降幅逐渐减小;防腐涂装可有效提高海工现浇混凝土长期抗氯离子侵蚀性能,并且随养护龄期t_(c)增长,防腐涂装对于降低混凝土表面氯离子含量C_(s)和表观氯离子扩散系数D a效果愈发显著;综合考虑海洋潮汐区环境现浇混凝土力学性能的发展和防腐涂装措施的有效性,采用硅烷和聚氨酯涂层进行涂装时建议养护龄期分别不小于5、10 d。This article was based on indoor simulated marine environment erosion tests using concrete,by analyzing the compressive strength,coating bonding strength and chloride ion diffusion behavior of marine cast-in-place concrete after erosion,and the effects of anti-corrosion coating/treating ages on the mechanical properties and durability evolution of marine cast-in-place concrete were studied.The results show that compared with concrete without anti-corrosion coating/treating,anti-corrosion coating/treating concrete using silane and polyurethane coating shows a decrease in compressive strength f_(c) after erosion in marine tidal areas,and concrete f_(c) gradually decreases with the increase of curing age t_(c).Anti-corrosion coating/treating can effectively improve the long-term chloride ion erosion resistance of marine cast-in-place concrete,and with the increase of curing age t_(c),the effects of anti-corrosion coating/treating on reducing the surface chloride ion content C_(s) and apparent chloride ion diffusion coefficient D a of concrete becomes more significant.Taking into account the development of mechanical properties of cast-in-place concrete in the marine tidal zone environment and the effectiveness of anti-corrosion coating/treating measures,it is recommended to use silane and polyurethane coatings for coating with a curing age of not less than 5 and 10 d,respectively.

关 键 词：海工现浇混凝土 防腐涂装 力学性能 氯离子扩散 耐久性 

分 类 号：TU528[建筑科学—建筑技术科学]