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Enhancing corrosion resistance of reinforced concrete structures with hybrid fiber reinforced concrete
Service loads well below the yield strength of steel reinforcing bars lead to cracking of reinforced concrete. This paper investigates whether the crack resistance of Hybrid Fiber Reinforced Concrete (HyFRC) reduces the corrosion rate of steel reinforcing bars in concrete after cyclic flexural loading. The HyFRC that is being utilized in this study was specifically designed to delay dominant crack formation up to strain levels exceeding the yield strain of conventional steel reinforcing bars in composite flexural beams, thus providing it with superior crack resistance in relation to plain concrete. The reinforcing bars were extracted to examine their surface for corrosion and compare microcell and macrocell corrosion mass loss estimates against direct gravimetric measurements. Hybrid fiber reinforced composites are effective in delaying corrosion initiation and in reducing the corrosion rate due to their high propensity for crack resistance. The control specimens on the other hand exhibit high corrosion rates after being subjected to the same cyclic flexural loading due to the formation of flexural and splitting cracks. After the 9 month corrosion period, the influence of cracking resistance with regard to chloride migration was evidenced in the HyFRC chloride concentration profile. At the depths measured, the chloride concentration remained below both that of concrete near the vicinity of the flexural-induced crack and at 76 mm away from the crack location. This improvement is brought about by the ability of fiber reinforcement within the cover concrete to resist not only the flexural cracks formed during mechanical loading but also the development of splitting cracks. Over the course of the 9 month corrosion period, galvanic corrosion measurements underestimated the rebar mass loss by an order of magnitude. Hence, there may be a danger in relying only on macrocell measurements to determine the onset and extent of corrosion. Polarization resistance measurements, taking into account the contribution of microcell corrosion, provided a more accurate estimate of mass loss.
Enhancing corrosion resistance of reinforced concrete structures with hybrid fiber reinforced concrete
Service loads well below the yield strength of steel reinforcing bars lead to cracking of reinforced concrete. This paper investigates whether the crack resistance of Hybrid Fiber Reinforced Concrete (HyFRC) reduces the corrosion rate of steel reinforcing bars in concrete after cyclic flexural loading. The HyFRC that is being utilized in this study was specifically designed to delay dominant crack formation up to strain levels exceeding the yield strain of conventional steel reinforcing bars in composite flexural beams, thus providing it with superior crack resistance in relation to plain concrete. The reinforcing bars were extracted to examine their surface for corrosion and compare microcell and macrocell corrosion mass loss estimates against direct gravimetric measurements. Hybrid fiber reinforced composites are effective in delaying corrosion initiation and in reducing the corrosion rate due to their high propensity for crack resistance. The control specimens on the other hand exhibit high corrosion rates after being subjected to the same cyclic flexural loading due to the formation of flexural and splitting cracks. After the 9 month corrosion period, the influence of cracking resistance with regard to chloride migration was evidenced in the HyFRC chloride concentration profile. At the depths measured, the chloride concentration remained below both that of concrete near the vicinity of the flexural-induced crack and at 76 mm away from the crack location. This improvement is brought about by the ability of fiber reinforcement within the cover concrete to resist not only the flexural cracks formed during mechanical loading but also the development of splitting cracks. Over the course of the 9 month corrosion period, galvanic corrosion measurements underestimated the rebar mass loss by an order of magnitude. Hence, there may be a danger in relying only on macrocell measurements to determine the onset and extent of corrosion. Polarization resistance measurements, taking into account the contribution of microcell corrosion, provided a more accurate estimate of mass loss.
Enhancing corrosion resistance of reinforced concrete structures with hybrid fiber reinforced concrete
Verbesserung der Korrosionsbeständigkeit im Stahlbetonbau mit hybridfaserverstärktem Beton
Blunt, J. (author) / Jen, G. (author) / Ostertag, C.P. (author)
Corrosion Science ; 92 ; 182-191
2015
10 Seiten, 13 Bilder, 5 Tabellen, 41 Quellen
Article (Journal)
English
| British Library Online Contents | 2015
| British Library Online Contents | 2015
| European Patent Office | 2023
HYBRID FIBER REINFORCED CONCRETE
| Springer Verlag | 2006
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| British Library Conference Proceedings | 2006