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- Title
Performance of Geopolymer Concrete as an Innovative Repair Material for Reinforced Concrete Structures.
- Authors
Khalifa, Ashraf J.; El-Thakeb, Abo El-Wafa M.; El-Sebai, Ahmed M.; Elmannaey, Ahmed S.
- Abstract
Geopolymer concrete (GPC) is recently drawing the attention of the research community as it represents a durable and eco-friendly alternative to normal concrete. However, its use with steel fibres as a repair material for concrete substrates is a new area that requires further investigation. In this study, a mixture of fly ash, slag, and undensified silica fume was activated using a potassium-based activator. Then, the highest compressive strength blend was adopted. The effect of the curing regime, either partial saturation or wrap in plastic films, and the fibres ratio on the mechanical properties of GPC was studied. Adding fibres to GPC by volume ratios of 1, 2, and 3% enhanced its ductility and boosted the compression, tension, shear, flexural, and pull-out capacity of the fibrous GPC. Therefore, GPC with 2% steel fibres was selected as an innovative repair material for concrete substrates from practical and economical points of view. The durability of this repair material was evaluated using permeability and fire resistance tests. It showed lower permeability by 39% compared to normal concrete and withstood elevated temperatures up to 600 °C. Moreover, its interfacial bond and shear compatibility with concrete were found to be utterly high.
- Subjects
REINFORCED concrete; CONCRETE; FLY ash; PLASTIC films; SILICA fume
- Publication
Arabian Journal for Science & Engineering (Springer Science & Business Media B.V. ), 2024, Vol 49, Issue 4, p6145
- ISSN
2193-567X
- Publication type
Article
- DOI
10.1007/s13369-023-08548-4