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Study of Influence of Construction Defects on Durability of Reinforced Concrete

施工缺陷对钢筋混凝土耐久性影响的研究

基本信息

批准号：
16360216
负责人：
OTSUKI Nobuaki
金额：
$ 9.66万
依托单位：
Tokyo Institute 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. The properties of concrete influenced by material segregation were successfully evaluated using "minute compressive test, minute tensile test and minute diffusion cell test.2. It was confirmed that the rates of macrocell and microcell corrosion were largely influenced by material segregation. In particular, the material segregation made the rate of steel corrosion faster due to the different property of concrete between upper part and lower part of concrete or gap between steel bar and cement matrix.3. The rate of steel corrosion of horizontal steel bar in dry-wet condition was faster than that in submerged condition.4. It was confirmed that the steel corrosion in horizontal steel bar could be controlled using steel bar with cement past cover or fly ash.5. It was confirmed that the rate of carbonation, oxygen permeability and steel corrosion in concrete increases with temperature rising. It was also confirmed that the above phenomena followed Arrhenius theory. The activation energies of carbonation, oxygen permeability and steel corrosion in concrete could be obtained by Arrhenius theory.6. The influence of joint treatment on steel corrosion under tidal zone was large in early stage of concrete (3 months), otherwise the influence decreased in long term exposure. On the other hand the influence of joint treatment on steel corrosion on land was large for long time. And the most effective treatment method for reducing the corrosion rate at joint was removal of laitance on the old concrete.7. It was confirmed that the corrosion rate of steel exposed to concrete- atomistic condition became large when the surface of concrete covered by sand.8. The influence of heterogeneity of concrete on anticorrosive curren^+ could be evaluated.

1.采用“微压试验、微拉试验和微扩散池试验”成功评价了材料离析对混凝土性能的影响.结果表明，材料偏析对宏电池和微电池腐蚀速率有很大影响。特别是由于混凝土上、下两部分的混凝土性质不同或钢筋与水泥基体之间存在间隙，材料离析使钢筋锈蚀速度加快.干湿条件下水平钢筋的锈蚀速度比浸水条件下快.研究结果表明，采用钢筋混凝土覆盖层或粉煤灰覆盖层可以有效地控制水平钢筋的锈蚀.试验结果表明，随着温度的升高，混凝土的碳化速率、透氧速率和钢筋锈蚀速率均增大。同时也证实了上述现象符合阿耳忒弥斯理论。混凝土碳化活化能、透氧活化能和钢筋锈蚀活化能可由Arrhenius理论求得.在潮汐环境下，接头处理对钢筋锈蚀的影响在混凝土早期（3个月）较大，而在长期暴露后影响减小。另一方面，长期以来，接头处理对陆地上钢筋腐蚀的影响较大。降低接缝处腐蚀速率最有效的处理方法是去除旧混凝土表面的浮浆.研究结果表明，混凝土表面覆砂后，钢筋在混凝土原子化条件下的腐蚀速率变大.可以评价混凝土的非均匀性对腐蚀电流^+的影响。

项目成果

期刊论文数量（43）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

Influence of Temperature on Steel Corrosion in Concrete Affected by Carbonation

温度对碳化混凝土中钢腐蚀的影响

DOI：
发表时间：
2004
期刊：
Proceedings of the Concrete Structure Scenarios, JSMS Vol.4
影响因子：
0
作者：
Katsuya Nakajima;Nobuaki Otsuki;Takahiro Nishida;Shinichi Maruyama
通讯作者：
Shinichi Maruyama

Influence of Joint Treatment on Corrosion of Steel Bars in Concrete Exposed in Marine Environment for 25-years

接头处理对暴露在海洋环境25年的混凝土中钢筋腐蚀的影响

DOI：
发表时间：
2005
期刊：
Proceedings of 30th Conference on Our World in Concrete & Structures Singapore Vol.30
影响因子：
0
作者：
Fumika Ukishima;Nobuaki Otsuki;Takahiro Nishida;Melito A. Baccay;Aung Kyaw Min;Hidenori Hamada
通讯作者：
Hidenori Hamada

Influence of Bleeding on Minute Properties and Steel Corrosion in Concrete

泌水对混凝土微小性能及钢筋腐蚀的影响