全珊瑚海水混凝土的表面自由氯离子浓度和表观氯离子扩散系数  

Surface free chloride concentration and apparent chloride diffusion coefficient of coral seawater concrete

作　　者：达波[1] 余红发[1] 麻海燕[1] 张亚栋[2] 谭永山[1] 糜人杰 窦雪梅[1] 

机构地区：[1]南京航空航天大学土木工程系,南京210016 [2]解放军理工大学爆炸冲击防灾减灾国家重点实验室,南京210073

出　　处：《东南大学学报（自然科学版）》2016年第5期1093-1097,共5页Journal of Southeast University：Natural Science Edition

基　　金：国家重点基础研究发展计划(973计划)资助项目(2015CB655102);国家自然科学基金资助项目(51508272);江苏省普通高校研究生科研创新计划资助项目(KYLX15-0230)

摘　　要：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.Coral seawater concrete（ CSC） with different strength grades were prepared by using different cements. The distribution laws of the free chloride concentrations of CSC in seawater environment with different exposure times were studied. The surface free chloride concentration and the apparent chloride diffusion coefficient of CSC were calculated and the corresponding influences of the exposure time were discussed. The results showthat with the same exposure time,the ability to resist chloride diffusion of magnesium sulfate cement is better than that of ordinary cement. The surface free chloride concentration of CSC increases with the extension of the exposure time in an exponential form,and the growth rate is far lower than that of ordinary concrete. The apparent chloride diffusion coefficient of CSC decreases with the extension of the exposure time in a power function.Therefore,magnesium sulfate cement is recommended for actual CSC structures in marine environment,which can improve the ability to resist chloride diffusion and slowdown the speed of chloride ion intrusion to prolong the service life of structures.

关 键 词：全珊瑚海水混凝土 碱式硫酸镁水泥 暴露时间 表面自由氯离子含量 表观氯离子扩散系数 

分 类 号：TU528[建筑科学—建筑技术科学]