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Towards a triphasic Theory of Porous Media-based model for chloride-induced corrosion in reinforced concrete
This thesis is concerned with the initial development of a multiphase material model using the Theory of Porous Media (TPM) for the penetration of intermediary rust product into reinforced concrete subjected to chloride-induced corrosion. Research has shown that although the majority of time-to-crac...
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| Format: | Thesis |
| Language: | English |
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Department of Civil Engineering
2020
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| _version_ | 1867613143861035008 |
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| access_status_str | Open Access |
| author | Ndawula, Joanitta N. |
| author2 | Skatulla, Sebastian |
| author_browse | Ndawula, Joanitta N. Skatulla, Sebastian |
| author_facet | Skatulla, Sebastian Ndawula, Joanitta N. |
| author_sort | Ndawula, Joanitta N. |
| collection | Thesis |
| description | This thesis is concerned with the initial development of a multiphase material model using the Theory of Porous Media (TPM) for the penetration of intermediary rust product into reinforced concrete subjected to chloride-induced corrosion. Research has shown that although the majority of time-to-cracking service life models for reinforced concrete structures neglect the permeation of rust into the cement paste adjacent to the reinforcement, it is this mechanism that is responsible for discrepancies between experimental data and model results. The model presented may be used to simulate the transport of water and gas through the capillary pores in concrete and the diffusion of iron III chloride within the pore solution. Iron III chloride is a soluble chloride complex formed as an intermediary product during the oxidation reaction at the anode of the corrosion cell. This solute is transported in the pore solution from low oxygen conditions and is oxidized in oxygen-rich conditions resulting in the precipitation of rust in the concrete pores. The Theory of Porous Media has proven proficient for modelling the material behaviour of porous solid bodies saturated with one or more fluids but has yet to be applied to chloride-induced reinforcement corrosion of reinforced concrete. This work outlines the initial efforts of using TPM to model the rust transport process coupled with the poro-elastic material response of reinforced concrete. The latter accounts for the stress build-up due to rust precipitation and volume expansion. The chloride complex is described by a concentration within the liquid phase and is therefore not assigned a unique volume fraction. Precipitation of the rust is not included here as it will be added at a later stage in the development of a more accurate reinforced concrete chloride induced corrosion model. It is intended that the model thus developed may be adapted for other deterioration mechanisms in concrete. |
| format | Thesis |
| id | oai:open.uct.ac.za:11427/31022 |
| institution | University of Cape Town (South Africa) |
| language | eng |
| last_indexed | 2026-06-10T12:31:28.055Z |
| license_str | Not specified — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UCTD — University of Cape Town Open Access Repository |
| publishDate | 2020 |
| publishDateRange | 2020 |
| publishDateSort | 2020 |
| publisher | Department of Civil Engineering |
| publisherStr | Department of Civil Engineering |
| record_format | dspace |
| source_str | UCTD — University of Cape Town Open Access Repository |
| spelling | oai:open.uct.ac.za:11427/31022 Towards a triphasic Theory of Porous Media-based model for chloride-induced corrosion in reinforced concrete Ndawula, Joanitta N. Skatulla, Sebastian Beushausen, Hans Engineering This thesis is concerned with the initial development of a multiphase material model using the Theory of Porous Media (TPM) for the penetration of intermediary rust product into reinforced concrete subjected to chloride-induced corrosion. Research has shown that although the majority of time-to-cracking service life models for reinforced concrete structures neglect the permeation of rust into the cement paste adjacent to the reinforcement, it is this mechanism that is responsible for discrepancies between experimental data and model results. The model presented may be used to simulate the transport of water and gas through the capillary pores in concrete and the diffusion of iron III chloride within the pore solution. Iron III chloride is a soluble chloride complex formed as an intermediary product during the oxidation reaction at the anode of the corrosion cell. This solute is transported in the pore solution from low oxygen conditions and is oxidized in oxygen-rich conditions resulting in the precipitation of rust in the concrete pores. The Theory of Porous Media has proven proficient for modelling the material behaviour of porous solid bodies saturated with one or more fluids but has yet to be applied to chloride-induced reinforcement corrosion of reinforced concrete. This work outlines the initial efforts of using TPM to model the rust transport process coupled with the poro-elastic material response of reinforced concrete. The latter accounts for the stress build-up due to rust precipitation and volume expansion. The chloride complex is described by a concentration within the liquid phase and is therefore not assigned a unique volume fraction. Precipitation of the rust is not included here as it will be added at a later stage in the development of a more accurate reinforced concrete chloride induced corrosion model. It is intended that the model thus developed may be adapted for other deterioration mechanisms in concrete. 2020-02-11T11:53:55Z 2020-02-11T11:53:55Z 2019 2020-01-29T07:24:04Z Master Thesis Masters MSc http://hdl.handle.net/11427/31022 eng application/pdf Department of Civil Engineering Faculty of Engineering and the Built Environment |
| spellingShingle | Engineering Ndawula, Joanitta N. Towards a triphasic Theory of Porous Media-based model for chloride-induced corrosion in reinforced concrete |
| thesis_degree_str | Master's |
| title | Towards a triphasic Theory of Porous Media-based model for chloride-induced corrosion in reinforced concrete |
| title_full | Towards a triphasic Theory of Porous Media-based model for chloride-induced corrosion in reinforced concrete |
| title_fullStr | Towards a triphasic Theory of Porous Media-based model for chloride-induced corrosion in reinforced concrete |
| title_full_unstemmed | Towards a triphasic Theory of Porous Media-based model for chloride-induced corrosion in reinforced concrete |
| title_short | Towards a triphasic Theory of Porous Media-based model for chloride-induced corrosion in reinforced concrete |
| title_sort | towards a triphasic theory of porous media based model for chloride induced corrosion in reinforced concrete |
| topic | Engineering |
| url | http://hdl.handle.net/11427/31022 |
| work_keys_str_mv | AT ndawulajoanittan towardsatriphasictheoryofporousmediabasedmodelforchlorideinducedcorrosioninreinforcedconcrete |