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采用自然扩散法研究了珊瑚混凝土在模拟海水环境中的氯离子扩散行为,探讨了养护龄期、暴露时间、强度等级和环境差异性对珊瑚混凝土表面氯离子浓度的影响。结果表明:在海洋环境中,珊瑚混凝土的表面氯离子浓度随着暴露时间的延长而呈乘幂的增长,随着养护龄期的延长而下降,随着混凝土强度等级的增加而下降;海水环境下,C50珊瑚混凝土的表面氯离子浓度比相同条件下的C50普通混凝土高出约3.5倍,且增长速率远远高于普通混凝土;在相同的养护龄期与暴露时间,我国南海实际岛礁环境中立方体试件的表面氯离子浓度比实验室数据要高出60%~90%,实际工程中珊瑚混凝土结构的表面氯离子浓度数值比较稳定,比实验室数据高出1.2~1.6倍。因此实际海洋环境下的珊瑚混凝土结构,为了保证结构强度并考虑氯离子扩散的影响,应尽量延长养护时间,有利于提高珊瑚混凝土的服役寿命。
The natural diffusion method was used to study the chloride ion diffusion behavior of coral concrete in simulated seawater environment. The effects of curing age, exposure time, intensity grade and environmental differences on chloride ion concentration on coral concrete surface were also discussed. The results show that in the marine environment, the surface chloride ion concentration of coral concrete increases exponentially with the extension of exposure time, decreases with the increase of curing age, and decreases with the increase of concrete strength. The seawater environment , The surface chloride ion concentration of C50 coral concrete is about 3.5 times higher than that of C50 normal concrete under the same conditions, and the growth rate is much higher than ordinary concrete; at the same curing age and exposure time, the actual reef environment in South China Sea The surface chloride ion concentration of the cubic cube specimen is 60% -90% higher than that of the laboratory data. The actual chloride ion concentration of the concrete structure in the concrete project is relatively stable, which is 1.2-1.6 times higher than the laboratory data. Therefore, in the actual marine environment, the structure of coral concrete should be prolonged as far as possible in order to ensure the structural strength and to consider the impact of chloride ion diffusion, which will help to improve the service life of coral concrete.