采用不同种类水泥制备出不同强度等级的全珊瑚海水混凝土(CSC),研究其在海水浸泡环境下不同暴露时间的自由氯离子含量的分布规律,计算了CSC的表面自由氯离子含量和表观氯离子扩散系数,并探讨了暴露时间对这2个参数的影响规律.结果表明:在相同的暴露时间下,碱式硫酸镁水泥的抗Cl~-扩散渗透能力优于普通硅酸盐水泥;CSC的表面自由氯离子含量随着暴露时间的延长而呈指数型增加,且增长速率远低于普通混凝土;CSC的表观氯离子扩散系数随着暴露时间的延长而呈幂函数型递减.因此,对于实际海洋环境下的CSC结构,建议采用碱式硫酸镁水泥,从而有利于提高抗Cl~-扩散渗透能力,减缓Cl~-的侵入速度,以达到延长结构服役寿命的目的. The CSCs with different strength grades were prepared by using different types of cements. The distribution of free chlorine ions at different exposure time in seawater immersion was studied. The free chlorine content and apparent chlorine Ion diffusion coefficient and the effect of exposure time on these two parameters were discussed.The results show that the anti-Cl ~ - diffusion and penetration ability of basic magnesium sulfate cement is better than that of ordinary Portland cement under the same exposure time.CSC , The content of free chlorine ion increased exponentially with the extension of exposure time, and the growth rate was much lower than that of normal concrete.The apparent chloride ion diffusion coefficient of CSC decreased exponentially with the extension of exposure time.Therefore, For the actual CSC structure in the ocean, it is recommended to use basic magnesium sulfate cement to improve the resistance to Cl ~ - diffusion and penetration and slow down the invasion rate of Cl ~ - in order to extend the service life of the structure.