Influencing factors affecting steel corrosion of concrete members subjected to fatigue loading

疲劳荷载下混凝土构件钢材腐蚀的影响因素

• 批准号: 21760351
• 负责人: HAYASHI Kazuhiko
• 金额: $ 2.5万
• 依托单位: Yokohama National University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Young Scientists (B)
• 财政年份: 2009
• 资助国家: 日本
• 起止时间: 2009 至 2010
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-21760351/
• 关键词: コンクリート構造; 耐久性; 疲労; 鋼材腐食; ひび割れ; ひび割れ幅; 鉄筋コンクリート; かぶり; 塩害; 内部損傷; 物質移動

To clarify the relationship between steel corrosion and cracks in RC members subjected to cyclic loading, influencing factors affecting steel corrosion were examined. Focusing on the loading condition and cracking condition in actual structures, measurement of crack width near reinforcing bars and accelerated steel corrosion tests were carried out. As results, crack width near reinforcing bars and bond degradation length increased as the cover length exceed particular threshold value. Steel corrosion may initiate earlier despite of having larger cover thickness. It was clarified that crack width near reinforcing bars may be the important factor on steel corrosion.

为了阐明经受循环载荷的RC成员的钢腐蚀与裂纹之间的关系，检查了影响钢腐蚀的影响因素。关注实际结构中的负载条件和开裂条件，进行了测量在加固条附近的裂纹宽度和加速钢腐蚀测试。结果，随着覆盖长度超过特定的阈值，裂纹宽度附近的裂纹宽度和粘结降解长度增加。尽管覆盖厚度较大，但钢腐蚀仍可能提前产生。可以澄清的是，钢筋附近的裂纹宽度可能是钢腐蚀的重要因素。

项目成果

かぶりの増加がRC部材のひび割れ内部形状と鋼材腐食に及ぼす影響

增加覆盖层对钢筋混凝土构件裂纹内部形状和钢材腐蚀的影响

• 发表时间: 2010
• 期刊: コンクリート構造物の補修,補強,アップグレード論文報告集 第10巻
• 作者: 長沼光;林和彦;椿龍哉;細田暁
• 通讯作者: 細田暁