Influence of Silica Fume (SF) Content on Passive Film Formation of Steel Reinforcement Inside Hardened Concrete
Corrosion is one of the causes of failure in reinforced concrete structures, and forming a passive film on the steel is essential for protection. Although several studies have looked at passive film formation in concrete pore solutions, few have considered its formation in hardened concrete and the...
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| Format: | Article |
| Language: | English |
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MDPI AG
2025-01-01
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| Series: | Corrosion and Materials Degradation |
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| Online Access: | https://www.mdpi.com/2624-5558/6/1/3 |
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| author | Marcella Amaral Isaac Aguiar Oliveira Diogo Henrique de Bem Giovana Costa Réus Gustavo Macioski Marcelo Miranda Farias Marcelo Henrique Farias de Medeiros |
| author_facet | Marcella Amaral Isaac Aguiar Oliveira Diogo Henrique de Bem Giovana Costa Réus Gustavo Macioski Marcelo Miranda Farias Marcelo Henrique Farias de Medeiros |
| author_sort | Marcella Amaral |
| collection | DOAJ |
| description | Corrosion is one of the causes of failure in reinforced concrete structures, and forming a passive film on the steel is essential for protection. Although several studies have looked at passive film formation in concrete pore solutions, few have considered its formation in hardened concrete and the influence of silica fume (SF) in the binder composition. This study aims to evaluate the influence of the SF content on passive film formation time in concrete. Periodic measurements assessed the electrical resistivity and corrosion current density of concrete samples containing 5%, 10%, 15%, and 20% SF. The alkalinity of the mixtures and the kinetics of the pozzolanic reaction were also monitored by XRD and titration tests. The control mixtures exhibited susceptibility to corrosion, regardless of the curing age evaluated. In contrast, the partial replacement of cement with SF accelerated the formation of the passive film on the steel surface, suggesting a delayed onset of corrosion due to modifications in the physical properties of the concrete. Also, the portlandite content and pH can predict passive film formation, with SF significantly accelerating this process. |
| format | Article |
| id | doaj-art-1ee01147fc524c4da94e768ba8e2d25a |
| institution | Kabale University |
| issn | 2624-5558 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Corrosion and Materials Degradation |
| spelling | doaj-art-1ee01147fc524c4da94e768ba8e2d25a2025-08-20T03:43:21ZengMDPI AGCorrosion and Materials Degradation2624-55582025-01-0161310.3390/cmd6010003Influence of Silica Fume (SF) Content on Passive Film Formation of Steel Reinforcement Inside Hardened ConcreteMarcella Amaral0Isaac Aguiar Oliveira1Diogo Henrique de Bem2Giovana Costa Réus3Gustavo Macioski4Marcelo Miranda Farias5Marcelo Henrique Farias de Medeiros6Center for Studies in Civil Engineering (CESEC), Department of Civil Engineering, Federal University of Paraná, Curitiba 81531-980, PR, BrazilCenter for Studies in Civil Engineering (CESEC), Department of Civil Engineering, Federal University of Paraná, Curitiba 81531-980, PR, BrazilCenter for Studies in Civil Engineering (CESEC), Department of Civil Engineering, Federal University of Paraná, Curitiba 81531-980, PR, BrazilCenter for Studies in Civil Engineering (CESEC), Department of Civil Engineering, Federal University of Paraná, Curitiba 81531-980, PR, BrazilCenter for Studies in Civil Engineering (CESEC), Department of Civil Engineering, Federal University of Paraná, Curitiba 81531-980, PR, BrazilCenter for Studies in Civil Engineering (CESEC), Department of Civil Engineering, Federal University of Paraná, Curitiba 81531-980, PR, BrazilCenter for Studies in Civil Engineering (CESEC), Department of Civil Engineering, Federal University of Paraná, Curitiba 81531-980, PR, BrazilCorrosion is one of the causes of failure in reinforced concrete structures, and forming a passive film on the steel is essential for protection. Although several studies have looked at passive film formation in concrete pore solutions, few have considered its formation in hardened concrete and the influence of silica fume (SF) in the binder composition. This study aims to evaluate the influence of the SF content on passive film formation time in concrete. Periodic measurements assessed the electrical resistivity and corrosion current density of concrete samples containing 5%, 10%, 15%, and 20% SF. The alkalinity of the mixtures and the kinetics of the pozzolanic reaction were also monitored by XRD and titration tests. The control mixtures exhibited susceptibility to corrosion, regardless of the curing age evaluated. In contrast, the partial replacement of cement with SF accelerated the formation of the passive film on the steel surface, suggesting a delayed onset of corrosion due to modifications in the physical properties of the concrete. Also, the portlandite content and pH can predict passive film formation, with SF significantly accelerating this process.https://www.mdpi.com/2624-5558/6/1/3silica fumepassive film formationcorrosion current densityelectrical resistivityportlandite content |
| spellingShingle | Marcella Amaral Isaac Aguiar Oliveira Diogo Henrique de Bem Giovana Costa Réus Gustavo Macioski Marcelo Miranda Farias Marcelo Henrique Farias de Medeiros Influence of Silica Fume (SF) Content on Passive Film Formation of Steel Reinforcement Inside Hardened Concrete Corrosion and Materials Degradation silica fume passive film formation corrosion current density electrical resistivity portlandite content |
| title | Influence of Silica Fume (SF) Content on Passive Film Formation of Steel Reinforcement Inside Hardened Concrete |
| title_full | Influence of Silica Fume (SF) Content on Passive Film Formation of Steel Reinforcement Inside Hardened Concrete |
| title_fullStr | Influence of Silica Fume (SF) Content on Passive Film Formation of Steel Reinforcement Inside Hardened Concrete |
| title_full_unstemmed | Influence of Silica Fume (SF) Content on Passive Film Formation of Steel Reinforcement Inside Hardened Concrete |
| title_short | Influence of Silica Fume (SF) Content on Passive Film Formation of Steel Reinforcement Inside Hardened Concrete |
| title_sort | influence of silica fume sf content on passive film formation of steel reinforcement inside hardened concrete |
| topic | silica fume passive film formation corrosion current density electrical resistivity portlandite content |
| url | https://www.mdpi.com/2624-5558/6/1/3 |
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