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Influence of steel-concrete interface defects induced by top-casting on development of chloride-induced corrosion in RC beams under sustained loading

Abstract : This paper discusses the effect of defects in a steel-concrete interface under horizontal top-cast steel bars on the development of corrosion in reinforced concrete beams under sustained loading exposed to a chloride environment. The work was based on four beams exposed to climate accelerated natural corrosion for 29 months. The corrosion-induced cracking patterns were drawn after 8 and 24 months of exposure to the chloride environment, and cracking maps with crack widths were recorded at 29 months. The experimental results show that corrosion-induced cracks always developed much more quickly along the top-cast steel bars due to the existence of top-casting-induced defects. Such defects formed at the steel-concrete interface under horizontal top-cast bars due to bleeding, segregation and settlement of fresh concrete, and they were favorable to both initiation and propagation of corrosion.
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https://hal.insa-toulouse.fr/hal-01849720
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Submitted on : Thursday, July 26, 2018 - 2:40:25 PM
Last modification on : Friday, January 10, 2020 - 9:09:32 PM

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Linwen Yu, Raoul Francois, Richard Gagne. Influence of steel-concrete interface defects induced by top-casting on development of chloride-induced corrosion in RC beams under sustained loading. Materials and Structures, Springer Verlag, 2016, 49 (12), pp.5169--5181. ⟨10.1617/s11527-016-0852-2⟩. ⟨hal-01849720⟩

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