Impact of leaching on chloride ingress profiles in concrete

Alisa Machner, Marie Bjørndal, Aljoša Šajna, Nikola Mikanovic, Klaartje De Weerdt

Research output: Contribution to journalArticlepeer-review

12 Scopus citations

Abstract

To investigate the effect of leaching on chloride ingress profiles in concrete and mortar, we exposed concrete and mortar specimens for 90 and 180 days to two different exposure solutions: 3% NaCl, and 3% NaCl with KOH added to limit leaching. The solutions were replaced weekly. After exposure, we determined total chloride profiles to investigate the chloride ingress, and portlandite profiles to assess the extent of leaching. The results showed that leaching during exposure greatly affects the chloride ingress profiles in mortar and concrete. We found that leaching leads to considerably higher maximum total chloride content and deeper chloride penetration into the concrete than in the specimens where leaching was limited. We recommend therefore that leaching should be taken into account in standard laboratory testing and that more mechanistic service life models should be used to take into account the impact of leaching.

Original languageEnglish
Article number8
JournalMaterials and Structures/Materiaux et Constructions
Volume55
Issue number1
DOIs
StatePublished - Jan 2022

Keywords

  • Chloride ingress
  • Concrete
  • Leaching
  • Portlandite
  • Service life prediction

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