National Taiwan Ocean University Institutional Repository:Item 987654321/24176
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题名: Suitability of Several Current Used Concrete Durability Indices on Evaluating the Corrosion Hazard for Carbonated Concrete
作者: Jiang Jhy Chang;Weichung Yeih;Ran Huang;Chun Tao Chen
贡献者: NTOU:Department of Harbor and River Engineering
國立臺灣海洋大學:河海工程學系
关键词: Carbonation;Concrete durability;X-ray diffraction analysis
日期: 2004-03
上传时间: 2011-10-20T08:10:35Z
出版者: Materials Chemistry and Physics
摘要: Abstract:In this paper, the suitability of several current used concrete durability indices on evaluating the corrosion hazard for a carbonated concrete is examined. The experiment results reveal that the phenolphthalein solution (suggested by the RILEM CPC 18) may underestimate the corrosion risk. The X-ray diffraction analysis shows that there exists the carbonation product, CaCO3, before the carbonation front reaches there. In addition, the electrochemical measurements indicate the rebar encounters corrosion danger before the carbonation front reaches the rebar. Another two durability indices, namely the apparent resistance and the total charge accumulated in the chloride penetration test (RCPT), have been examined as well. These two methods may mislead our judgments to believe the reinforced concrete is in a sound condition once the concrete is carbonated. The densification of microstructure due to CaCO3 will reduce the apparent resistance and total accumulated charge in RCPT such that one may make a wrong judgment. The water absorption rate and sorptivity test also indicate that a carbonated concrete has a denser microstructure. Based on our experiments, it is suggested that the current used concrete durability indices may not be suitable on evaluating the corrosion hazard for a carbonated concrete. A more reliable pH indicator than the phenolphthalein solution is necessary in detecting the carbonation hazard.
關聯: 84(1), pp.71-78
URI: http://ntour.ntou.edu.tw/handle/987654321/24176
显示于类别:[河海工程學系] 期刊論文

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