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Development of New Method for Corrosion of Steel Reinforcement in Concrete Using AC Impedance

开发利用交流阻抗腐蚀混凝土中钢筋的新方法

基本信息

批准号：
07650526
负责人：
TORII Kazuyuki
金额：
$ 0.32万
依托单位：
Kanazawa University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1996
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07650526/
关键词：
AC Impedance Method Rapid Chloride Permeability Test (AASHTO T277)Electrical Resistivity Corrosion of Steel Reinforcement Coefficient of Diffusion for Chloride Ions Mineral Admixtures Blast-furnace Slag Concrete 急速試験法 AASHTO T277 塩化物イオン

项目摘要

From the results of 5-year exposure test under a marine environment, it was confirmed that the fly ash 30% concrete and the silica fume 10% concrete performed better in corrosive behavior of the steel bar in concrete compared with the normal Portland cement concrete and the blast-furface slag 50% concrete, and that the results of the Rapid Chloride Permeability Test (RCPT,AASHTO T277) gave a reasonable estimate of chloride ion permeability of normal Portland cement concrete in service although the AASHTO T277 test was primarily a conductivity measurement. With the regard to the chloride ion permeability of concretes incorporating mineral admixtures, the results of the RCPT showed that both the surface and the interior of the concretes with mineral admixtures were much less permeable to chloride ions than the corresponding normal Portland cement concrete under all curing and environmental conditions. Furthermore, it was found that there was a good correlation between the charge passed in the RCPT,the initial direct current and the electrical resistance, which also correlated well with the chloride ion penetration depth into the concrete after the RCPT.With the regard to the diffusion coefficient for chloride ions calculated according to the Ficks second law, the coulomb values obtained from the RCPT also correlated well with both the diffusion coefficient for chloride ions and the depth of chloride ion penetration after the exposure to a marine environment.

根据海洋环境下5年暴露试验的结果，证实了与普通波特兰水泥混凝土和矿渣50%混凝土相比，粉煤灰30%混凝土和硅灰10%混凝土在混凝土中钢筋的腐蚀行为方面表现得更好，并且快速氯离子渗透试验的结果（RCPT，AASHTO T277）给出了使用中的普通波特兰水泥混凝土的氯离子渗透性的合理估计，尽管AASHTO T277试验主要是电导率测量。关于混凝土的氯离子渗透性，将矿物掺合料，RCPT的结果表明，无论是表面和内部的混凝土与矿物掺合料是远远低于相应的正常波特兰水泥混凝土在所有的养护和环境条件下的氯离子渗透。此外，研究发现，在RCPT中通过的电荷、初始直流电流和电阻之间存在良好的相关性，并且与RCPT后氯离子渗透到混凝土中的深度也具有良好的相关性。从RCPT获得的库仑值也与氯离子的扩散系数和暴露于海洋环境后氯离子渗透的深度很好地相关。