| 種別 | paper |
| 主題 | An Approach to Durability Design for RC Structures Subjected to Chloride Induced Reinforcement Corrosion |
| 副題 | |
| 筆頭著者 | MISRA Sudhir（Kajima Corporation） |
| 連名者1 | TSUTSUMI Tomoaki（Tokyo Electric Power Company） |
| 連名者2 | MOTOHASHI Kenichi（Kajima Corporation） |
| 連名者3 | |
| 連名者4 | |
| 連名者5 | |
| キーワード | |
| 巻 | 14 |
| 号 | 1 |
| 先頭ページ | 1173 |
| 末尾ページ | 1178 |
| 年度 | 1992 |
| 要旨 | INTRODUCTION Premature deterioration on account of chloride induced reinforcement corrosion in marine structures or bridge decks subjected to use of deicing salts has attracted a lot of attention recently. It has been found that durability of concrete structures is related closely with a wide spectrum of areas, such as, design considerations, materials used, workmanship, quality control, environmental conditions, etc. Thus it becomes difficult to develop an overall system to ensure the durability of a structure over its service life. But recently concerted attempts have been made to synthesize the knowledge gained thus far into a comprehensive philosophy for design of structures subjected to deterioration on account of chloride attack, etc. The Japan Society of Civil Engineers, JSCE, and the Japan Concrete Institute, JCI, have published the first draft proposals for “Durability Design”. Though the drafts can provide a useful framework in developing methods to study the synergistic effects of diverse factors e.g., the w/c of concrete, type/amount of cement, flexural cracks, site conditions, etc., both the approaches are to a large extent empirical and do not necessarily reflect the mechanism of the corrosion process. In this paper, a methodology, that rationally incorporates the deterioration mechanism into durability design of corrosion prone structures is discussed. Some results from parts of the research programme involving experimental and analytical work being done to study the effect and relative importance of various factors in the different stages of the deterioration process are also presented. CONCLUDING REMARKS An attempt has been made in this paper to put some of the individual results discussed in greater detail elsewhere within the overall perspective of durability design of structures subjected to chloride induced reinforcement corrosion, considering the formation of longitudinal cracks along the bars as the limiting level of deterioration. The process has been assumed to proceed in two distinct stages: a) chloride penetration, and b) corrosion propagation. Though the inter-relationship between the various factors is highly complex, the paper provides a general outline that can be followed estimate the time spans involved in the two stages. |
| PDFファイル名 | 014-01-1203.pdf |