Chloride Ingress in Concrete with Different Age at Time of First Chloride Exposure

Esben Østergaard Hansen, Martin Riis Iskau, Marianne Tange Hasholt

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Abstract

Concrete structures cast in spring have longer time to hydrate and are therefore denser and more resistant to chloride ingress when first subjected to deicing salts in winter than structures cast in autumn. Consequently, it is expected that a spring casting will have a longer service life.
This hypothesis is investigated in the present study by testing drilled cores from concrete cast in 2012 and 2013 on the Svendborgsund Bridge. The cores are subject to petrographic examination and mapping of chloride profiles. Moreover, chloride migration coefficients have been measured. The study shows that the effect of the extra time of hydration obtained when casting in spring increases the expected service life of the concrete structure significantly.
Original languageEnglish
JournalNordic Concrete Research
Volume55
Issue number2
ISSN0800-6377
Publication statusPublished - 2016

Keywords

  • Chloride ingress
  • Age-dependent chloride diffusion coefficient
  • Field exposure
  • Service life

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