Experimental and Analytical Study on the Influence of Joints and Surface Coating on Macro-cell Corrosion of Reinforcement in Concrete

接缝和表面涂层对混凝土钢筋宏胞腐蚀影响的实验与分析研究

• 批准号: 06452257
• 负责人: OTUSKI Nobuaki
• 金额: $ 2.88万
• 依托单位: TOKYO INSTITUTE OF TECHNOLOGY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (B)
• 财政年份: 1995
• 资助国家: 日本
• 起止时间: 1995 至 无数据
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-06452257/
• 关键词: macro-cell; micro-cell; oxygen penetration; repair materials; relative humidity; water-cement ratio (W; C); 打継ぎ; 塩化物イオン; 酸素透過量; 表面塗装

As the summery of this study, following concluding remarks were clarified :(1) Oxygen permeability of concrete decreases as the water-cement ratio (W/C) becomes small or the the humidity of the environment becomes large and that the resistance of concerete decreases as the humidity becomes large.(2) The corrosion rate of macro-cell and micro-cell becomes lower as the water-cement ratio (W/C) of concrete becomes low, and the quality of repair materials is very influensive on the mechanisms of macro-cell corrosion.(3) The corrosion rate is largest when the relative humidity is around 80% at which the concrete can be well supplied with oxygen and water. This is because the corrosion rate is depend on oxygen permeability when the humidity is high and by the resistance of concrete when the humidity is low.(4) From the experimental study of macro-cell corrosion mechanisms, it is considered that macro-cell corrosion occures in the old concretenear the joint when the difference of chloride content between old and repair materials is large.(5) The macro-cell corrosion rate which is formed by the difference of chloride content is influenced by the quality of concrete.(6) From the experimental and analytical study about prevention of macro-cell corrosion by coating, it can be said that the macro-cell corrosion rate is very low when chloride contentof old concrete before coating is low.

作为本研究的总结，阐明了以下结论：(1)混凝土的透氧性随着水灰比(W/C)的减小或环境湿度的增大而降低，混凝土的阻力随着湿度的增大而减小。(2)随着混凝土的水灰比(W/C)的降低，宏电池和微电池的腐蚀率都会降低。修复材料的质量对宏观电池的腐蚀机理有很大影响。(3)当相对湿度在80%左右时，混凝土的腐蚀速率最大，此时混凝土的氧气和水供应充足。这是因为腐蚀速率在高湿度时取决于透氧性，在低湿度时取决于混凝土的电阻。(4)从宏电池腐蚀机理的试验研究中，认为当旧材料和修补材料的氯含量差异较大时，旧混凝土接缝处发生宏电池腐蚀。(5)混凝土质量影响由氯含量差异形成的宏电池腐蚀速度。(6)通过涂层防止宏电池腐蚀的试验和分析研究，可以说，当涂层前的旧混凝土的氯离子含量较低时，宏观电池腐蚀率很低。

项目成果

守分敦郎、長滝重義、大即信明、宮里心一: "マクロセル腐食の防止を目的とした電気防食の適用性に関する基礎的研究" 土木学会 第50回年次学術講演会講演概要集. 5. 326-327 (1995)

Atsuro Moribun、Shigeyoshi Nagataki、Nobuaki Ohsoku、Shinichi Miyazato：“防止大电池腐蚀的阴极保护适用性的基础研究”日本土木工程学会第 50 届年会学术会议摘要 5. 326-327（1995 年）。 ）

Atsuro MORIWAKE,Nario MIURA,Shigeyoshi NAGATAKI and Nobuaki OTSUKI: "Study on Durability of Surface Coatings Performed on a Existing Concrete Structure" Journal of Materials, Concrete Structures and Pavements. No.520, V-28. 99-110 (1995)

Atsuro MORIWAKE、Nario MIURA、Shigeyoshi NAGATAKI 和 Nobuaki OTSUKI：“现有混凝土结构表面涂层的耐久性研究”材料、混凝土结构和路面杂志。

守分敦郎、三浦成夫、長滝重義、大即信明: "既設コンクリート構造に施工した表面塗装材料の耐久性評価" 土木学会論文集. V-28. 99-110 (1995)

Atsuro Moriwabu、Shigeo Miura、Shigeyoshi Nagataki、Nobuaki Ohsoku：“应用于现有混凝土结构的表面涂层材料的耐久性评估”日本土木工程师学会会议记录 V-99-110 (1995)。

宮里心一,大即信明,長滝重義,守分敦郎: "コンクリートの打継ぎが鉄筋の腐食に及ぼす影響" 土木学会・第49回年次学術講演会講演概要集V. 49. 542-543 (1994)

Shinichi Miyazato、Nobuaki Ohsoku、Shigeyoshi Nagataki、Atsuro Moribune：“混凝土浇注缝对钢筋腐蚀的影响”第 49 届日本土木学会学术会议摘要 V. 49. 542-543（1994 年）

Nobuaki OTSUKI,Shigeyoshi NAGATAKI and Makoto HISADA: "Influence of Joints and Cracks on Macro-Cell Corrosion in Reinforced Concrete ;" Proceedings o the 4th International Conference on Structural Failure Durability and Retrofitting. 327-334 (1993)

Nobuaki OTSUKI、Shigeyoshi NAGATAKI 和 Makoto HISADA：“钢筋混凝土中接缝和裂纹对宏观细胞腐蚀的影响；”