岛礁珊瑚混凝土结构寿命影响因素分析  

Analysis of Influence Factors on Service Life of Reef Reinforced Coral Aggregate Concrete Structure

作　　者：吴彰钰 余红发[1] 麻海燕[1] 达波[1] 谭永山[1] WU Zhang-yu;YU Hong-fa;MA Hai-yan;DA Bo;TAN Yong-shan(Department of Civil Engineering,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China)

机构地区：[1]南京航空航天大学土木工程系

出　　处：《硅酸盐通报》2019年第8期2347-2355,共9页Bulletin of the Chinese Ceramic Society

基　　金：国家重点基础研究发展计划(973计划)课题(2015CB655102);国家自然科学基金(51678304、51878350);中国博士后科学基金(2018M630558);江苏省普通高校研究生科研创新计划(KYLX15-0230);南京航空航天大学研究生创新基地(实验室)开放基金(kfjj20170109)

摘　　要：为了探究临界氯离子浓度(C cr)、混凝土强度等级、保护层厚度、初始氯离子含量(C 0)等耐久性因素对岛礁环境下的珊瑚混凝土(Coral aggregate concrete,CAC)结构服役寿命的影响规律,选取两种强度等级的CAC试件进行实验室浸泡暴露试验,同时运用基于可靠度理论和修正氯离子扩散理论的ChaDuraLife V1.0寿命分析软件,对热带海洋环境下的CAC结构进行寿命分析研究。结果表明:随着C cr和保护层厚度的提高,CAC结构的服役寿命逐渐延长;海水淡化(C 0值降低)对选用普通易锈蚀钢筋的CAC结构的服役寿命有显著的影响,但是对选用304奥氏不锈钢筋的CAC结构的服役寿命几乎没有影响;对于设计寿命50 a的CAC结构,无论海水是否淡化,都必须采用304奥氏不锈钢钢筋。In order to investigate the effect of durability factors such as critical chlorine ion content(C cr),concrete strength grade,cover thickness and initial chlorine ion content on the service life of coral aggregate concrete(CAC)under reef environment,two kinds of CAC specimens with different strength grades were selected for the laboratory immersion exposure test.Meanwhile,the ChaDuraLife V1.0 life analysis software based on reliability theory and modified chloride ion diffusion theory was used to analyze the life of CAC structures in tropical marine environment.The results show that with the increase of the C cr and the thickness of the protective layer,the service life of CAC structure is gradually extended.Desalination of seawater has a significant impact on the life of CAC structure with the common reinforcement that is easy to rust and has little effect on the service life of the 304 austenitic stainless steel CAC structure.The 304 austenitic stainless steel reinforcement must be adopted regardless of whether or not desalination of seawater is used in the CAC structure with a design life of 50 a.

关 键 词：珊瑚混凝土 岛礁环境 临界氯离子浓度 保护层厚度 淡化海水 服役寿命 

分 类 号：TU528[建筑科学—建筑技术科学]