Influence of steel-concrete interface defects induced by top-casting on development of chloride-induced corrosion in RC beams under sustained loading - INSA Toulouse - Institut National des Sciences Appliquées de Toulouse Access content directly
Journal Articles Materials and structures Year : 2016

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

Linwen Yu
  • Function : Author
Richard Gagne
  • Function : Author

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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Dates and versions

hal-01849720 , version 1 (26-07-2018)

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Linwen Yu, Raoul François, 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, 2016, 49 (12), pp.5169--5181. ⟨10.1617/s11527-016-0852-2⟩. ⟨hal-01849720⟩
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