Real-time chloride diffusion coefficient in concrete using embedded resistivity sensors
| Autor: | Kamat, Ameya, Abbas, Yawar, Blagojevic, Andrija, van Casteren, Toine, Walraven, J.C., Ye, Guang, Dong, Hua, Liu, Jiaping, Schlangen, Erik, Miao, Changwen |
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| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: | |
| Zdroj: | 4th International Rilem Conference on Microstructure Related Durability of Cementitious Composites: Microdurability 2020 4th International Rilem Conference on Microstructure Related Durability of Cementitious Composites |
| Popis: | Service life of concrete infrastructure is severely compromised because of chloride-induced corrosion and measuring the chloride content is crucial to determine the remaining service life. DuraCrete provides a chloride ingress model based on Fick’s 2nd law. Although the diffusion coefficient is modelled as a time-dependent variable, the DuraCrete solution averages it to a constant value. This simplification leads to inaccurate estimation of the chloride content. A new analytical solution that addresses the underlying mathematical discrepancy has been proposed. However, the time-dependent diffusion coefficient is still based on an empirical factor. In this study, a real-time durability monitoring system has been developed using remotely operated resistivity sensors. Such a system is able to monitor the time dependent diffusion coefficient without the need to incorporate empirical factors. Additionally, a numerical technique to find an approximation of the proposed improved analytical solution is presented using real-time resistivity measurements from laboratory and real structures. The results show that the discrete sensor data measurements over time provide a good approximation of the proposed analytical solution. The system developed in this study is used as a data-driven input parameter to supplement the existing chloride models. |
| Databáze: | OpenAIRE |
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