Evaluation model for durability of concrete in marine environments
The diffusion of chloride is driven by a concentration gradient in the pore solution of concrete. By considering chloride-binding, the properties of pore solution and the pore structure of concrete, the diffusion coefficient of chloride in concrete was defined in three ways, namely, the intrinsic, t...
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| Other Authors: | |
| Format: | Thesis |
| Language: | English |
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2008
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| Online Access: | http://hdl.handle.net/10356/13094 |
| _version_ | 1826127337517744128 |
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| author | Jiang, Jiabiao |
| author2 | Chan, Kin Seng |
| author_facet | Chan, Kin Seng Jiang, Jiabiao |
| author_sort | Jiang, Jiabiao |
| collection | NTU |
| description | The diffusion of chloride is driven by a concentration gradient in the pore solution of concrete. By considering chloride-binding, the properties of pore solution and the pore structure of concrete, the diffusion coefficient of chloride in concrete was defined in three ways, namely, the intrinsic, the effective and the apparent diffusion coefficient of chloride. An electrically accelerated method was proposed to determine the effective diffusion coefficient of chloride in concrete and to investigate the influencing factors. In the proposed method, the Nemst-Einstein equation was adopted to quantitatively relate the diffusion coefficient to the rate of chloride migration under an electric field. The effects of the applied voltage and the thickness of concrete specimen were investigated for optimizing the electrical measurement. For calibration purposes, real time diffusion tests were carried out in parallel to validate the accelerated method. The experimental results have shown that the proposed electrically accelerated method provided a simple, rapid and reliable measurement of the effective diffusion coefficient of chloride in concrete. |
| first_indexed | 2024-10-01T07:07:15Z |
| format | Thesis |
| id | ntu-10356/13094 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T07:07:15Z |
| publishDate | 2008 |
| record_format | dspace |
| spelling | ntu-10356/130942023-03-03T19:29:36Z Evaluation model for durability of concrete in marine environments Jiang, Jiabiao Chan, Kin Seng School of Civil and Structural Engineering DRNTU::Engineering::Civil engineering::Structures and design The diffusion of chloride is driven by a concentration gradient in the pore solution of concrete. By considering chloride-binding, the properties of pore solution and the pore structure of concrete, the diffusion coefficient of chloride in concrete was defined in three ways, namely, the intrinsic, the effective and the apparent diffusion coefficient of chloride. An electrically accelerated method was proposed to determine the effective diffusion coefficient of chloride in concrete and to investigate the influencing factors. In the proposed method, the Nemst-Einstein equation was adopted to quantitatively relate the diffusion coefficient to the rate of chloride migration under an electric field. The effects of the applied voltage and the thickness of concrete specimen were investigated for optimizing the electrical measurement. For calibration purposes, real time diffusion tests were carried out in parallel to validate the accelerated method. The experimental results have shown that the proposed electrically accelerated method provided a simple, rapid and reliable measurement of the effective diffusion coefficient of chloride in concrete. Doctor of Philosophy (CSE) 2008-07-09T06:05:24Z 2008-10-20T07:04:22Z 2008-07-09T06:05:24Z 2008-10-20T07:04:22Z 1999 1999 Thesis http://hdl.handle.net/10356/13094 en 240 p. application/pdf |
| spellingShingle | DRNTU::Engineering::Civil engineering::Structures and design Jiang, Jiabiao Evaluation model for durability of concrete in marine environments |
| title | Evaluation model for durability of concrete in marine environments |
| title_full | Evaluation model for durability of concrete in marine environments |
| title_fullStr | Evaluation model for durability of concrete in marine environments |
| title_full_unstemmed | Evaluation model for durability of concrete in marine environments |
| title_short | Evaluation model for durability of concrete in marine environments |
| title_sort | evaluation model for durability of concrete in marine environments |
| topic | DRNTU::Engineering::Civil engineering::Structures and design |
| url | http://hdl.handle.net/10356/13094 |
| work_keys_str_mv | AT jiangjiabiao evaluationmodelfordurabilityofconcreteinmarineenvironments |