A Study on Limit State for Steel Corrosion of Concrete Members with Ground Granulated Blast-Furnace Slag

粒化高炉矿渣混凝土构件钢材腐蚀极限状态研究

• 批准号: 14350235
• 负责人: MATSUSHITA Hiromichi
• 金额: $ 7.81万
• 依托单位: KYUSHU UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2002
• 资助国家: 日本
• 起止时间: 2002 至 2004
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-14350235/
• 关键词: Ground Granulated Blast-furnace Slag; Carbonation; Salt Damage; Corrosion; Chloride Ion; Combined Deterioration; Calcium Chloride; Monitoring; EPMA; 細孔径分布

The purpose of this study is to determine the carbonation speed and the penetration speed of chloride ion of concrete with ground granulated blast-furnace slag (GGBFS) and to investigate the effects of carbonation and salt damage to the limit state of steel corrosion. Electron probe micro analysis (EPMA) was performed to obtain the detailed distribution of chloride ion. A sensor to monitoring steel corrosion was made on an experimental basisFirstly, normal-strength and high-strength concrete with GGBFS were tested in laboratories. High replacement ratio, high fineness, and long wet curing increased resistance to carbonation and chloride ion penetration. Chloride ion penetration of high-strength concrete was restrained at surface layer, and carbonation depth and penetration depth of chloride ion hardly increased. Only the concrete with GGBFS could resist to an antifreezing agent such as calcium chloride. Moreover, GGBFS could delay combined deterioration of carbonation and chloride penetration, and of carbonation and acid rain.Secondly, past researches on the limit state of steel corrosion and the results of exposure tests were summarized. It was found that the important factors to dominate corrosion were concentration of chloride ion, wind velocity, temperature, the deviation of temperature and humidity.Then, a method using EPMA to obtain the detailed distribution of chloride ion in concrete was verified experimentally. The results by EPMA method well agreed with the results by usual titration method.Lastly, practicality of the sensor made on experimental basis was examined. The condition that the steel wire of sensor corroded and electric resistance of it increased was clarified, and there is prospect of a practical application of the sensor for structures.

本研究的目的是测定掺矿渣粉混凝土的碳化速度和氯离子渗透速度，并探讨碳化和盐害对钢筋腐蚀极限状态的影响。采用电子探针分析（EPMA）技术，获得了氯离子的详细分布。在实验基础上研制了一种监测钢筋锈蚀的传感器。高置换率、高细度和长时间湿养护可提高抗碳化和抗氯离子渗透性。高强混凝土的氯离子渗透在表层受到抑制，碳化深度和氯离子渗透深度几乎没有增加。只有掺矿渣微粉的混凝土才能抵抗氯化钙等防冻剂。此外，矿渣微粉还可以延缓碳化与氯离子渗透、碳化与酸雨的联合劣化。其次，总结了国内外对钢筋腐蚀极限状态的研究和暴露试验的结果。结果表明，氯离子浓度、风速、温度、温湿度偏差是影响混凝土腐蚀的重要因素，并通过实验验证了利用电子探针（EPMA）获取混凝土中氯离子详细分布的方法。电子探针法测定结果与常规滴定法测定结果吻合较好。最后，对在实验基础上研制的传感器进行了实用性检验。阐明了传感器钢丝腐蚀和电阻增大的原因，并对传感器在结构上的实际应用进行了前景展望。

项目成果

Influence of Mineral Admixture on Combined Deterioration of Chloride Ion Penetration and Carbonation

矿物掺合料对氯离子渗透和碳化联合劣化的影响

• 发表时间: 2005
• 期刊: Proceedings of the Japan Concrete Institute Vol.27, No.1
• 作者: Yuichiro KAWABATA et al.

濱田秀則: "港湾環境におけるコンクリート中鉄筋の腐食に及ぼす気象・海象条件の影響"コンクリート工学論文集. 13-2. 57-70 (2002)

Hidenori Hamada：“气象和海洋条件对港口环境中混凝土钢筋腐蚀的影响”混凝土工程杂志 13-2 (2002)。

コンクリート中への塩化物浸透過程に関する既往調査の整理と分析

整理分析以往氯化物渗透混凝土过程的研究

• 发表时间: 2002
• 期刊: コンクリート工学年次論文集 Vol.24,Nol.1
• 作者: 前田聡 et al.

コンクリート中鉄筋の電気化学的計測に影響を及ぼす容易人に関する実験的考察

混凝土中钢筋电化学测量影响的实验研究

• 发表时间: 2004
• 期刊: コンクリート工学論文集 15・1
• 作者: K.Goto;N.Ono;S.Ando;濱田 秀則
• 通讯作者: 濱田 秀則

Penetration of the Chloride Ion to the High-Strength Concrete Mixed with Ground Granulated Blast-Furnace Slag -Measurement of a Distribution of the Chloride Ion Concentration by EPMA-

氯离子对掺有粉状粒化高炉矿渣的高强度混凝土的渗透-EPMA测量氯离子浓度分布-

• 发表时间: 2005
• 期刊: Journal of the Society of Materials Science, Japan Vol.54, No.8
• 作者: T.Takeda;Y.Tsuchiya;T.Kuroe;T.Zeniya;J.Wu;T.T.Lwin;T.Yashiro;T.Yuasa;K.Hyodo;K.Matsumura;F.A.Dilmanian;Y.Itai;T.Akatsuka;Hiromichi MATSUSHITA
• 通讯作者: Hiromichi MATSUSHITA