Maintenance of concrete structures under severe environment in coastal zone of the Japan Sea

日本海沿岸恶劣环境下混凝土结构的维护

基本信息

批准号：
16360225
负责人：
MARUYAMA Kyuichi
金额：
$ 9.28万
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：
2004
资助国家：
日本
起止时间：
2004 至 2005
项目状态：
已结题

项目摘要

1) Diffusion coefficient of chloride ions in mortar with admixtures was measured. Influences of kind and amount of admixtures on diffusion coefficient were investigated. Prediction equation of diffusion coefficient was proposed as a function of porosity and specific surface area of pore structure.2) Exposure test of mortar specimens was conducted. Specimens were exposed in more than ten points in Niigata Prefecture. It was revealed that part of chlorides that had reached concrete surface can penetrate into concrete. Long term chloride ingress can be predicted based on the result of short term exposure test.3) Local transport process of airborne salt around an actual concrete structure was measured. Numerical simulation method for transport process of airborne salt was developed.4) Damage of concrete structures in Ishikawa Prefecture was investigated. Deterioration grade, amount of airborne salt and chloride ingress were examined.5) Effectiveness of surface coating and water repellent was evaluated by laboratory test.6) Damage of concrete bridges by de-icing agent was investigated in Northern Tohoku region. It is clarified that damage by de-icing agent may be localized.7) Resistant of sprayed mortar against combined action of salt attack and frost damage was examined by electric migration test.

1)测定外加剂砂浆中氯离子的扩散系数。研究了外加剂种类和用量对扩散系数的影响。提出了作为孔隙率和孔隙结构比表面积函数的扩散系数预测方程。2)对砂浆试件进行了暴露试验。新泻县内有十多个地点暴露了标本。据透露，部分到达混凝土表面的氯化物可以渗透到混凝土中。根据短期暴露试验的结果可以预测长期氯化物的进入。3)测量了实际混凝土结构周围空气中盐的局部迁移过程。开发了气载盐输送过程的数值模拟方法。4)对石川县混凝土结构的损伤进行了调查。检查了劣化程度、空气中盐分和氯化物的进入量。5) 通过实验室测试评估了表面涂层和防水剂的有效性。6) 在东北北部地区调查了除冰剂对混凝土桥梁的损坏情况。明确了除冰剂造成的损害可能是局部的。7)通过电迁移试验检验了喷涂砂浆对盐蚀和冻害联合作用的抵抗能力。

项目成果

期刊论文数量（53）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

Seismic retrofitting of reinforced concrete columns with continuous fiber rope and concrete jacket

连续纤维绳和混凝土护套钢筋混凝土柱抗震加固

DOI：
发表时间：
2006
期刊：
Third International Conference on FRP Composites in Civil Engineering (発表予定)
影响因子：
0
作者：
山田文則;細山田得三;下村匠;峠坂直樹;Takumi SHIMOMIRA et al.
通讯作者：
Takumi SHIMOMIRA et al.

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