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南海海域珊瑚混凝土结构的耐久性影响因素
作者:达波1 余红发1 麻海燕1 张亚栋2 朱海威1 余强3 叶海民4 景显双4 
单位: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 3. 海军海防工程研究中心 北京 100070 4. 中国人民解放军92003部队 广东 湛江 524003 
关键词:南海岛礁环境 珊瑚混凝土 氯离子含量 氯离子结合能力 表观氯离子扩散系数 自由氯离子扩散系数 
分类号:TU528
出版年,卷(期):页码:2016,44(2):253-260
DOI:10.14062/j.issn.0454-5648.2016.02.11
摘要:

?为了探究热带海洋环境下混凝土结构的耐久性,通过对我国南海岛礁珊瑚混凝土结构的现场调研与测试,研究了普通混凝土与珊瑚混凝土的破坏现状、碳化深度、自由氯离子含量(Cf)和总氯离子含量(Ct),计算了混凝土结构的氯离子结合能力(R)、表面自由氯离子含量(Cs)、表观氯离子扩散系数(Da)和自由氯离子扩散系数(Df)。结果表明:在南海岛礁工程中,珊瑚混凝土主要破坏特征为混凝土保护层胀裂、剥落、垮塌、露筋、钢筋锈蚀等;在同一岛礁环境,珊瑚混凝土Cs比普通混凝土Cs高13~28倍,Cs分布规律从高到低依次为水下区、浪溅区、大气区;珊瑚混凝土在水下区与浪溅区的Da值分别是大气区的15和7倍;普通混凝土在南海岛礁环境下的Da值比北欧、北美及我国东海等近海环境普通混凝土Da值大4~20倍;在南海岛礁工程中,必须提高混凝土的抗氯离子扩散渗透能力,同时加强迎风面混凝土结构的附加防护和提高其密实度,才能延长珊瑚混凝土结构的使用寿命。

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 To explored the durability of concrete structures in tropical marine environment, main destruction, carbonization depth, free chloride concentration (Cf), total chloride concentration (Ct), chloride binding capacity (R), surface free chloride concentration   (Cs), apparent chloride diffusion coefficients (Da) and free chloride diffusion coefficients (Df) of coral concrete were studied through site investigation and laboratory experiments in the South China Sea. The results showed that in the South China Sea environment, coral concrete structure main failure characteristics are cover crack, collapse, steel bar exposed, steel corrosion. Coral concrete Cs is 13-28 times higher than ordinary concrete Cs in the same reef environment: Cs distribution rule from high to low is underwater zone, splash zone, atmosphere zone. Splash zone and underwater zone were respectively 15 and 7 times the atmospheric zone of coral concrete Da. In the South China Sea ordinary concrete Da is 4–20 times higher than Northern Europe, North America and East China Sea offshore environments ordinary concrete. Tropical marine engineering must improve the anti-chloride permeability of concrete, especially strengthen the additional protection windward surface of concrete structure and improve it density to enhance the service life of these structures.

基金项目:
国家自然科学基金项目(51508272);国家重点基础研究发展计划资助项目(2015CB655 102);爆炸冲击防灾减灾国家重点实验室开放课题资助(DPMEIKF201303);江苏省普通高校研究生科研创新计划项目(KYLX15-0230)。
作者简介:
达波(1988—),男,博士研究生。
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