| 種別 | Paper |
| 主題 | EFFECT OF CORROSION OF REINFORCEMENT ON THE LOAD CARRYING CAPACITY OF RC BEAMS |
| 副題 | |
| 筆頭著者 | Sudhir MISRA |
| 連名者1 | Taketo UOMOTO |
| 連名者2 | |
| 連名者3 | |
| 連名者4 | |
| 連名者5 | |
| キーワード | |
| 巻 | 9 |
| 号 | 2 |
| 先頭ページ | 675 |
| 末尾ページ | 680 |
| 年度 | 1987 |
| 要旨 | 1.INTRODUCTION Reinforced concrete is one of the most important construction materials in use in the present day. Though it has shown excellent structural and durability characteristics, of late there have been instances of premature deterioration of some of the structures, especially in and around the coastal areas. One of the main causes for this deterioration is the corrosion of reinforcing bars. The presence of chloride ions near the bar surface is the primary cause of the corrosion. The chlorides in concrete could have been present in fresh concrete either from the use of sea-sand as fine aggregate, or the use of salts (e.g. calcium chloride) as accelerators. The other possibility is the penetration of chloride ions from the environment into hardened concrete. Structures built off-shore or close to the shoreline are susceptible to the ingress of chloride ions from splash of sea water or sea breeze. In colder countries, the deicing salts used during winter, could serve as the source of chloride ions. Most of the previous papers, deal with the mechanisms of the corrosion processes, protection of structures and field survey of deteriorated concrete structures (1-4). The available literature on the structural implications of the corrosion on parameters like the load carrying capacity, etc. is rather limited (5,6). This study was undertaken to primarily determine the extent of reduction, in the load carrying capacity of RC beams when reinforcing bars were subjected to corrosion. 5. CONCLUSIONS Based on the experiments carried out as part of this study, the following conclusions can be drawn: 1) General corrosion within the limits of this study, does not result in appreciable reduction in the tensile strength of reinforcing bars. 2) When the corrosion occurs, there could be substantial reduction in the load carrying capacity of beams even though the tensile strength of the reinforcing bars does not reduce much. 3) Corrosion of reinforcing bars may result in reduced ductility of beams, and this is specially relevant in the present day, when the actual loads to the structures are closer to the design loads. 4) The extent of reduction in the load carrying capacity depends upon a lot of factors such as, loading conditions, presence of shear reinforcement, type of loading, etc.. |
| PDFファイル名 | 009-01-2116.pdf |