碩士 / 國立臺灣海洋大學 / 河海工程學系 / 100 / The major purpose of the present study is to investigate the service life of existing reinforced concrete (RC) bridge and the deterioration of existing RC bridge deck under chloride environments. For predicting the remaining service life of existing RC bridge in chloride-laden environments, the corrosion process has been divided into three stages, the initiation time ti, the depassivation time tp, and the corrosion time tcorr. The total service life of existing RC bridge can be expressed as t=ti+tp+tcorr. Numerous mathematical models were applied to calculate each ti, tp, and tcorr. The value of t minus the service life t0 is the remaining life tr. In addition, the Fick second law of linear diffusion was used to evaluate the durability of existing concrete deck, The diffusion coefficient of chloride was first calculated by inverse method and then calculated the depth of chlroide penetration for determining whether steel corrosion or not. Finally, the durability of existing concrete deck was evaluated by the influenced factors such as environment, materials, employment function and the degree of structural damge. The results of present study were described as follows:
1. Based on the high reliability and detailed data of bored specimens in-situ, the prediction of remaining life is reliable and serviceable.
2. The diffusion relationship reveals that time-to-corrosion varies with the square of the depth of the rebar.
3. The results of this study were provided as a basis for repair,
reinforcement, and demolition of existing RC bridges.
| Identifer | oai:union.ndltd.org:TW/100NTOU5192054 |
| Date | January 2012 |
| Creators | Li-Ze Yang, 楊禮澤 |
| Contributors | Jiang-Jhy Chang, Ming-Te Liang, 張建智, 梁明德 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 52 |
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