Accurate cover crack modelling of reinforced concrete structures subjected to non-uniform corrosion

Xun Xi, Shangtong Yang, Chun-Qing Li

Research output: Contribution to journalArticle

Abstract

Concrete cover cracking caused by reinforcement corrosion is a significant durability problem of reinforced concrete structures. Extensive research has been carried out in the last few decades while most were focused on corrosion of a single reinforcing bar. Very little research has examined the whole cover cracking of reinforced concrete structures due to multiple reinforcement corrosion. This paper develops a numerical model to predict the structural failure of the whole cover of concrete induced by corrosion of multiple reinforcing bars. Moreover, a non-uniform corrosion model is established based on experimental results, in contrast to conventional uniform assumption. Two typical cover failure modes under the non-uniform corrosion of multiple reinforcing bars are identified and discussed. The effects of cover thickness, reinforcement spacing, fracture energy of concrete, etc., on cover cracking patterns and crack width are also investigated. The derived numerical model is verified by comparing the results with those from experiments in literature. Accurate prediction of concrete cover cracking can allow timely maintenance of existing structures and rational design for new buildings which prolongs the service life of the reinforced concrete structures.
LanguageEnglish
Pages1628-1640
Number of pages23
JournalStructure and Infrastructure Engineering
Volume14
Issue number12
Early online date12 Oct 2018
DOIs
Publication statusPublished - 1 Dec 2018

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concrete structure
reinforced concrete
Concrete construction
Reinforced concrete
corrosion
crack
Corrosion
Cracks
Concretes
reinforcement
modeling
Reinforcement
Numerical models
Fracture energy
durability
Service life
Failure modes
Durability
spacing
cracking (fracture)

Keywords

  • durability
  • corrosion
  • reinforcement
  • concrete structures
  • simulation models
  • finite element method
  • reinforced concrete

Cite this

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abstract = "Concrete cover cracking caused by reinforcement corrosion is a significant durability problem of reinforced concrete structures. Extensive research has been carried out in the last few decades while most were focused on corrosion of a single reinforcing bar. Very little research has examined the whole cover cracking of reinforced concrete structures due to multiple reinforcement corrosion. This paper develops a numerical model to predict the structural failure of the whole cover of concrete induced by corrosion of multiple reinforcing bars. Moreover, a non-uniform corrosion model is established based on experimental results, in contrast to conventional uniform assumption. Two typical cover failure modes under the non-uniform corrosion of multiple reinforcing bars are identified and discussed. The effects of cover thickness, reinforcement spacing, fracture energy of concrete, etc., on cover cracking patterns and crack width are also investigated. The derived numerical model is verified by comparing the results with those from experiments in literature. Accurate prediction of concrete cover cracking can allow timely maintenance of existing structures and rational design for new buildings which prolongs the service life of the reinforced concrete structures.",
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Accurate cover crack modelling of reinforced concrete structures subjected to non-uniform corrosion. / Xi, Xun; Yang, Shangtong; Li, Chun-Qing.

In: Structure and Infrastructure Engineering, Vol. 14, No. 12, 01.12.2018, p. 1628-1640.

Research output: Contribution to journalArticle

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AU - Yang, Shangtong

AU - Li, Chun-Qing

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N2 - Concrete cover cracking caused by reinforcement corrosion is a significant durability problem of reinforced concrete structures. Extensive research has been carried out in the last few decades while most were focused on corrosion of a single reinforcing bar. Very little research has examined the whole cover cracking of reinforced concrete structures due to multiple reinforcement corrosion. This paper develops a numerical model to predict the structural failure of the whole cover of concrete induced by corrosion of multiple reinforcing bars. Moreover, a non-uniform corrosion model is established based on experimental results, in contrast to conventional uniform assumption. Two typical cover failure modes under the non-uniform corrosion of multiple reinforcing bars are identified and discussed. The effects of cover thickness, reinforcement spacing, fracture energy of concrete, etc., on cover cracking patterns and crack width are also investigated. The derived numerical model is verified by comparing the results with those from experiments in literature. Accurate prediction of concrete cover cracking can allow timely maintenance of existing structures and rational design for new buildings which prolongs the service life of the reinforced concrete structures.

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KW - corrosion

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