Accurate analysis of transport process of corrosive agents into concrete structures by micropore structural model

利用微孔结构模型准确分析腐蚀剂向混凝土结构中的传输过程

• 批准号: 17360203
• 负责人: SHIMOMURA Takumi
• 金额: $ 7.68万
• 依托单位: Nagaoka University of Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2005
• 资助国家: 日本
• 起止时间: 2005 至 2006
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-17360203/
• 关键词: airborne salt; numerical simulation; surface chloride; surface coating; micropore structure; chloride attack; reinforcement corrosion; diffusion; 表面保護工法; 気象条件; 海象条件

1) Airborne salt reaching on the surfaces of concrete structures could be successfully predicted by numerical transport analysis in which configuration of structure, geography around structure, weather condition and ocean condition are considered.2) It was shown that averaged airborne salt in the time scale of week can be estimated by the numerical analysis in which averaged weather and ocean conditions are considered.3) It was clarified by field measurement that airborne salt reaching on the surface of structures is less than that blown in the air.4) The investigators developed a simple experimental system that simulates the developing process of surface chlorides of concrete subjected by rain and sunshine in the laboratory5) Since diffusion coefficient of chloride ions in surface coating materials for concrete is very small, defects and deterioration of the coating materials themselves maybe significantly decreases their protecting ability. Average diffusion coefficient of surface coating systems including artificial defects were quantified by electrolytic permeability test. It was experimentally verified that average diffusion coefficient can be expressed as a function of degree of defect.

1）通过考虑结构配置、结构周围地理、天气条件和海洋条件的数值传输分析，可以成功预测到达混凝土结构表面的气载盐。2）考虑平均天气和海洋条件的数值分析表明，可以估计周时间尺度的平均气载盐。3）通过现场测量澄清，到达结构表面的气载盐是 4）研究人员开发了一个简单的实验系统，在实验室中模拟了混凝土表面经雨水和阳光照射的氯化物的发展过程5）由于混凝土表面涂层材料中氯离子的扩散系数很小，涂层材料本身的缺陷和劣化可能会显着降低其保护能力。通过电解渗透性测试对包括人工缺陷的表面涂层系统的平均扩散系数进行量化。实验验证了平均扩散系数可以表示为缺陷程度的函数。

项目成果

Prediction of airborne salt reaching on surface of structures by numerical analysis

通过数值分析预测到达结构表面的空气盐分

• 发表时间: 2007
• 期刊: Proceedings of the Japan Concrete Institute Vol.29(to be published)
• 作者: Fuminori YAMADA;Tokuzo HOSOYAMADA Takumi SHIMOMURA
• 通讯作者: Tokuzo HOSOYAMADA Takumi SHIMOMURA

Effect of defects in surface coating for concrete on its permeability

混凝土表面涂层缺陷对其渗透性的影响

• 发表时间: 2006
• 期刊: Proceedings of the Japan Concrete Institute Vol.28, No.1
• 作者: Takamichi OGURA;Hiroo YAMASHITA;Takumi SHIMOMURA
• 通讯作者: Takumi SHIMOMURA

コンクリー卜用表面被覆材の欠陥が物質遮蔽性能に及ぼす影響

混凝土表面涂层材料缺陷对材料屏蔽性能的影响

• 发表时间: 2006
• 期刊: コンクリート工学年次論文集 28・1
• 作者: 小倉孝道;山下寛生;下村 匠
• 通讯作者: 下村 匠

Mechanism of chloride sheltering by surface coating material and impregnating material

表面涂层材料和浸渍材料的氯离子屏蔽机理

• 发表时间: 2005
• 期刊: Proceedings of the Japan Concrete Institute Vol.27, No.1
• 作者: Kazuhiro IKEZU;Takumi SHIMOMURA
• 通讯作者: Takumi SHIMOMURA

飛来塩分の影響を受けるコンクリートの表面塩分に関する実験的検討

气浮盐对混凝土表面盐度影响的试验研究

• 发表时间: 2007
• 期刊: コンクリート工学年次論文集 29
• 作者: 山下寛生;下村 匠;山田文則
• 通讯作者: 山田文則