種別 paper
主題 CORROSION OF REBARS UNDER DIFFERENT CONDITIONS
副題
筆頭著者 Sudhir MISRA(Kajima Corporation)
連名者1 Taketo UOMOTO(Tokyo University)
連名者2  
連名者3  
連名者4  
連名者5  
キーワード
12
2
先頭ページ 825
末尾ページ 830
年度 1990
要旨 INTRODUCTION
Reinforcement corrosion involves the setting up electrical potential differences between anodic (corroding) and cathodic sites, followed by the passage of electric current between them with the concrete serving as "electrolyte". Though, in almost all concrete structures, the reinforcement in its various forms, bars, tendons, stirrups, chairs, etc. constitutes an electrically continuous system, for various reasons, most of the research work carried out so far has been done by exposing the entire reinforcement of laboratory size specimens in more or less uniform exposure conditions. Thus, the effect of the simultaneous existence of different exposure conditions with respect to different segments of the reinforcement system, on the susceptibility of these different parts to corrosion has not been fully understood. This study was carried out to obtain a clearer understanding as to the part(s) of a structural element which is most susceptible to corrosion under simultaneous diverse exposure conditions and whether the corrosion activity can still be meaningfully monitored using natural potential measurements.
CONCLUDING REMARKS
1.Not all parts of a member are equally vulnerable to corrosion and the corrosion characteristics under actual conditions cannot be clarified by studying them independently under different conditions. 2.Corrosion was found only in portions that were subjected to cyclic wetting and drying, or were at the interface of the immersed and aerial portions. 3.The “underside” of the bars is more vulnerable to corrosion. 4.Water movement within the matrix plays a crucial role in determining the chloride concentration and could even lead to deposits of crystalline NaCl, etc. depending upon exposure conditions. 5.Measurement of natural potentials alone may be grossly misleading under certain conditions and the saturation of the cover concrete is identified as one such interfering factors.
PDFファイル名 012-01-2139.pdf


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