基于护环电极(GRE)原理,研究了提高钢筋混凝土在线腐蚀速率测量精度的方法;通过GRE电极将极化电流约束在辅助电极CE投影面区域内的钢筋网架内确定钢筋的被极化面积;同时,采用智能GRE电流约束值修正程序,使钢筋腐蚀速率测量值与均匀极化技术测量值保持一致性.结果表明,GRE约束系数λ与混凝土自生电阻率及钢筋腐蚀状态有一定的函数关系,当GRE电流对CE极化电流进行完全约束时即λ=1,钝化态钢筋腐蚀速率将比实际值偏小几倍.要准确测量钢筋锈蚀速率,钢筋自腐蚀电位Ecorr越负,混凝土电阻Rc越小,则约束系数λ也必须减小,基于此文中提出了一种基于Ecorr和Rc的智能约束系数计算程序,并研制了便携式在线钢筋锈蚀检测仪.现场试验证明:对于活化态钢筋,λ=0.2～0.6,而对于钝化态钢筋,λ=0.5～0.8时腐蚀速率测量结果较为准确.
参考文献
| [1] | Feliu S,Gonzalez J A,Andrade C.Effect of current distribution on corrosion rate measurements in reinforced concrete[J].Corrosion,1995,51 (1):79. |
| [2] | Feliu S,Gonzalez J A,Escudero M L,et al.Possibilities of the guard ring for electrical signal confinement in the polarization measurements of reinforcements[J].Corrosion,1990,46 (12):1015. |
| [3] | Law D W,Millard S W,Bungey J B.Effect of electrode orientation on linear polarization measurements using sensor controlled guard ringBritish[J].Corrosion Journal,2000,35 (2):136. |
| [4] | Feliu S,Gonzalez J A,Miranda J H,et al.Possibilities and problems of in sire techniques for measuring steel corrosion rates in large reinforced concrete structures[J].Corrosion Science,2005,47:217. |
| [5] | 丁元力,董泽华,周华林.等.基于护环技术的混凝土中钢筋腐蚀监测研究[J].中国腐蚀与防护学报,2006,26(5):257. |
| [6] | Wojtas H.Determination of polarization resistance of reinforcement with a sensorized guard ring:Analysis of errors[J].Corrosion,2004,60(4):414. |
| [7] | Wojtas H.Determination of corrcsion rate of reinforcement with a modulated guard ring electrode;analysis of errors due to lateral current distribution[J].Corrosion Science,2004,46 (7):1621. |
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