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Durability of steel fibre reinforced concrete in corrosive environments
Steel Fibre Reinforced Concrete (SFRC) is increasingly used worldwide for the construction of civil infrastructure under aggressive exposure conditions. The use of carbon-steel fibres in concrete as partial or total replacement of conventional steel reinforcement bars is becoming an attractive solution to the industry, considering its simplified production processes, cost-effectiveness and overall durability in compressed elements subject to corrosive exposures. However, the durability aspect is still under discussion when addressing the corrosion of carbon-steel fibres bridging cracks in concrete under some exposures, such as wet-dry conditions. Contradictions in design guidelines and in former studies regarding the durability of cracked SFRC under these exposures hampers further development of SFRC infrastructure. In particular, the deterioration mechanisms affecting cracked SFRC under wet-dry cyclic exposures are not well-understood. This thesis presents an experimentally-focused multiscale investigation that aims at identifying the main variables influencing steel fibre corrosion in concrete subject to wet-dry cycles and quantifying the effect of fibre corrosion on the mechanical performance of SFRC. The experimental campaign covered studies of SFRC exposed to wet-dry cycles under chloride and carbon-dioxide exposure, at the composite and single-fibre level, with focus on the deterioration inside cracks. Experiments at the composite level confirmed that corrosion damage in uncracked SFRC is negligible and does not entail damage to the mechanical performance of the uncracked material. Corrosion damage of steel fibres inside cracks narrower than 0.3 mm occurred at the outermost 20 – 40 mm of the crack and had a limited impact on the mechanical performance of the cracked SFRC over a period of two years. Significant increases of the residual tensile strength of the cracked SFRC after exposure were observed at the composite and single fibre level. A semi-empirical multiscale model based on the fibre bundle ...
Durability of steel fibre reinforced concrete in corrosive environments
Steel Fibre Reinforced Concrete (SFRC) is increasingly used worldwide for the construction of civil infrastructure under aggressive exposure conditions. The use of carbon-steel fibres in concrete as partial or total replacement of conventional steel reinforcement bars is becoming an attractive solution to the industry, considering its simplified production processes, cost-effectiveness and overall durability in compressed elements subject to corrosive exposures. However, the durability aspect is still under discussion when addressing the corrosion of carbon-steel fibres bridging cracks in concrete under some exposures, such as wet-dry conditions. Contradictions in design guidelines and in former studies regarding the durability of cracked SFRC under these exposures hampers further development of SFRC infrastructure. In particular, the deterioration mechanisms affecting cracked SFRC under wet-dry cyclic exposures are not well-understood. This thesis presents an experimentally-focused multiscale investigation that aims at identifying the main variables influencing steel fibre corrosion in concrete subject to wet-dry cycles and quantifying the effect of fibre corrosion on the mechanical performance of SFRC. The experimental campaign covered studies of SFRC exposed to wet-dry cycles under chloride and carbon-dioxide exposure, at the composite and single-fibre level, with focus on the deterioration inside cracks. Experiments at the composite level confirmed that corrosion damage in uncracked SFRC is negligible and does not entail damage to the mechanical performance of the uncracked material. Corrosion damage of steel fibres inside cracks narrower than 0.3 mm occurred at the outermost 20 – 40 mm of the crack and had a limited impact on the mechanical performance of the cracked SFRC over a period of two years. Significant increases of the residual tensile strength of the cracked SFRC after exposure were observed at the composite and single fibre level. A semi-empirical multiscale model based on the fibre bundle ...
Durability of steel fibre reinforced concrete in corrosive environments
Marcos Meson, Victor (author)
2019-01-01
Marcos Meson , V 2019 , Durability of steel fibre reinforced concrete in corrosive environments . Technical University of Denmark, Department of Civil Engineering .
Book
Electronic Resource
English
DDC:
621
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