水工混凝土氯离子扩散系数初期衰减规律研究  

Research on early attenuation of chloride diffusivity coefficient of hydraulic concrete in tidal reach

作　　者：伍亚玲[1] 张俊芝[1] 傅招旗[1] 庄华夏[1] 许亮[1] 

机构地区：[1]浙江工业大学建筑工程学院,浙江杭州310014

出　　处：《人民长江》2013年第11期90-92,110,共4页Yangtze River

基　　金：国家自然科学基金项目(50879079;51279181);水利部公益性行业科研专项经费项目(200901065)

摘　　要：在钱塘江自然感潮氯盐环境条件下,通过现场侵蚀试验,测得受侵蚀120,240,360,480 d和600 d后水工混凝土梁中的自由氯离子浓度。分析结果表明,随着侵蚀时间的推移,混凝土中自由氯离子浓度也相应增加;基于Fick第二定律拟合计算了氯离子扩散系数,计算结果显示,氯离子扩散系数随侵蚀时间推移而减小,且初期衰减较快其后趋于平稳,其衰减规律可用指数函数来表征。Under the chloride environment in a tidal reach of Qiantang River, an in - situ corrosion test on a concrete beam was carried out and the free chloride ion concentration of the beam on 120, 240, 360, 480 d and 600 d after corrosion were measured. The test results show that chloride ion concentration increase with the corrosion duration, and the chloride ion diffusivity are fitted and calculated on the basis of the Fick＇s second law. The calculated results reveal that the chloride ion diffusivity decreases with the time rapidly at early stage and later comes to a stable state, and the attenuation law can be fitted by exponential function.

关 键 词：混凝土 氯离子 扩散系数 衰减 FICK第二定律 感潮河段 

分 类 号：TV431[水利工程—水工结构工程]