矿渣混凝土在海洋环境中的氯离子扩散系数演变规律  

Research on Chloride Diffusion Coefficient of SGC Exposed to Marine Environment

作　　者：曾翔超[1] 余红发[1] 胡蝶 

机构地区：[1]南京航空航天大学土木工程系,南京210016 [2]江苏中核华纬工程设计研究有限公司,南京210019

出　　处：《硅酸盐通报》2014年第5期993-998,共6页Bulletin of the Chinese Ceramic Society

基　　金：国家自然科学基金项目(51178221;21276264);国家重点基础研究发展计划(973计划)资助项目(2009CB623203)

摘　　要：本文根据自然扩散法的原理,在模拟海水环境中研究了普通矿渣混凝土（SGC）的氯离子扩散特性。探讨了暴露时间,养护龄期,矿渣掺量与混凝土氯离子扩散系数的关系。实验表明了混凝土试件的氯离子扩散系数同暴露时间之间呈幂级数衰减规律,随养护龄期的延长而减小,且随着暴露时间的延长而增加,并逐渐趋于稳定,且扩散系数与养护时间及矿渣掺量有关;当养护龄期达到100~150 d,扩散系数趋于平稳;矿渣掺量达到30%时,混凝土的表观氯离子扩散系数随暴露时间的降低速度最快。因此,适当延长养护龄期及掺入矿渣,有助于延长混凝土结构在海洋环境的服役寿命。According to the Natural Diffusion Method, the chloride diffusion behavior of Slag concrete （SGC） exposed to marine environment was investigated by taking artificial seawater as medium. And the influences of curing age, exposed time and content of Slag （ SG ） on chloride diffusion is discussed. Results show that whether it is Ordinary Portland cement concrete （OPC） or SGC, the chloride diffusion coefficient of concrete decrease with the passage of curing age when being exposed to marine environment. However, the increase with the passage of exposing time gradually tends to stabilize. When curing age can reach 100-150 d,the chloride diffusion of SGC reduce and stabilize with the increase of the SG content. The best SG content is 30%. Therefore, being exposed to marine ,environment , the concrete structures should be prolonged wet curing age to 100-150 d and make the SG content up to 30%. These methods will enhance the service life of structures.

关 键 词：矿渣混凝土 养护龄期 氯离子扩散 暴露时间 

分 类 号：TU528[建筑科学—建筑技术科学]