CORROSION OF STEEL IN CABONATED CONCRETE OR CONCRETE CONTAINING CHALORIDEION

碳混凝土或含卤离子混凝土中钢的腐蚀

• 批准号: 10650564
• 负责人: OHNO Yoshiteru
• 金额: $ 2.56万
• 依托单位: Osaka University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1998
• 资助国家: 日本
• 起止时间: 1998 至 1999
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10650564/
• 关键词: STEEL CORROSION; CARBONATION; WATER CEMENTRATIO; CRACKING; COVER DEPTH; MACROCELL CORROSION; ACCELERATION-TEST; EXPOSURE-TEST

The paper reports the corrosion claracteristic of 38mm anodes of mild steel embeded in cracked section or uncracked concrete specimens, which were reinforced by deformed bars coated with thin epoxy film. The macrocells were set up by electrically connecting between the mild steel (anode part) and the stainless steels (cathodic part) embedded separately in the same specimens. First. the specimens were kept in air containig 10% CO_2. Concrete were partially or completely carbonated. Then the specimens were sujected to the proposed accelerated corrosion test of automatically repeated cycles of one day wetting in 65℃±3, 3.2% NaCl solution and one day drying in the empty tank. The corrosion current was measured continuously by a computer measuring system. The total period of exposure test was 35 cycles or 70 days. The results indicate that (1) the weight loss of steel increased as the crack width and the water by cement ratio increased. The cover thickness did not has effect on. (2)In the carbonated concrete speeimens that crack did not occurred, corrosion current flowed in W/C=50, 70% concrete. On the whole, the weight loss of steel in carbonated concrete in larger than that in noncarbonated concrete specimens before.

本文报道了38 mm低碳钢阳极埋于混凝土裂缝截面或无裂缝试件中的腐蚀特性。宏电池通过将分别嵌入同一试样中的低碳钢（阳极部分）和不锈钢（阴极部分）电连接而建立。先标本保存在含10%CO_2的空气中。混凝土部分或全部碳化。然后对试样进行拟定的加速腐蚀试验，即在65℃± 3.2%NaCl溶液中润湿一天，在空槽中干燥一天的自动重复循环。腐蚀电流由计算机测量系统连续测量。暴露试验的总周期为35个周期或70天。试验结果表明：（1）钢筋的质量损失随裂缝宽度和水灰比的增大而增大;（2）在未出现裂缝的碳化混凝土试件中，在W/C=50、70%的混凝土中有腐蚀电流流过。整体而言，碳化混凝土试件中钢筋的重量损失大于未碳化混凝土试件。

项目成果

柳濟峻,大野義照: "中性化したコンクリート中の鉄筋腐食に及ぼすひび割れの影響"日本建築学会大会学術講演梗概集. A-1. 721-722 (2000)

Jun Yanagi，Yoshiteru Ohno：“裂缝对中和混凝土中钢筋腐蚀的影响”日本建筑学会会议记录 A-1（2000 年）。

Jeijun You, Yoshiteru Ohno and Takashi Iida: "Influence of crack and carbonation of concrete on corrosion of steel"Proceedings of the Japan Concrete Institute. Vol. 22, No. 1. 187-192 (2000)

Jeijun You、Yoshiteru Ohno 和 Takashi Iida：“混凝土裂缝和碳化对钢材腐蚀的影响”日本混凝土学会会刊。

柳濟峻,大野義照,飯田隆史: "鉄筋腐食に及ぼすコンクリートのひび割れと中性化の影響"コンクリート工学年次論文集. Vol.22 No.1. 187-192 (2000)

Jun Yanagi、Yoshiteru Ohno、Takashi Iida：“混凝土开裂和碳化对钢筋腐蚀的影响”混凝土工程年报第 22 卷第 187-192 期（2000 年）。

Jeijun You and Yoshiteru Ohno: "Influence of crack on corrosion of steel in carbonated concrete"Proceedings of AIJ Kinki Chapter Research Meeting. No.40. 5-8 (2000)

Jeijun You 和 Yoshiteru Ohno：“碳化混凝土中裂纹对钢材腐蚀的影响”AIJ 近畿分会研究会议论文集。

柳 濟峻,大野義照,飯田隆史: "鉄筋腐食に及ぼすコンクリートのひび割れと中性化の影響"コンクリート工学年次論文報告集. 22-1(予定). (2000)

Keishun Yanagi、Yoshiteru Ohno、Takashi Iida：“混凝土开裂和碳化对钢筋腐蚀的影响”混凝土工程年度论文报告 22-1（预定）。