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fc下降,且随养护龄期tc增长,混凝土fc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tc增长,防腐涂装对于降低混凝土表面氯离子含量Cs和表观氯离子扩散系数Da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.
Effects of Anti-Corrosion Coating/Treating Ages on Performance Evolution of Marine Cast-in-Place Concrete
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 fc after erosion in marine tidal areas,and concrete fc gradually decreases with the increase of curing age tc.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 tc,the effects of anti-corrosion coating/treating on reducing the surface chloride ion content Cs and apparent chloride ion diffusion coefficient Da 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.
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