Progress of carbonation in chloride contaminated concretes

Yaocheng Wang, P. A M Basheer, S. Nanukuttan, Y. Bai

Research output: Chapter in Book/Report/Conference proceedingConference contribution

3 Citations (Scopus)

Abstract

Concretes used in marine environment are generally under the cyclic effect of CO2 and chloride ions (Cl-). To date, the influence of carbonation on ingress of chloride ions in concretes has been widely studied; in comparison, study on the influence of Cl-on the progress of carbonation is limited. During the study, concretes were exposed to independent and combined mechanisms of carbonation and chloride ingress regimes. Profiles of apparent pH and chloride concentration were used to indicate the progress of carbonation and ingress of Cl-in concretes. From the apparent pH profile, a carbonation front and a carbonation boundary were characterized according to profile of consumed hydroxyl ions (OH-). Results show that carbonation was significantly slowed down due to the existence of Cl-, viz. the depth of carbonation boundary was decreased; the profile of consumed OH-became modest; the carbonation front for different mixes presented slightly different trends. For the sound concretes, carbonation generated microcracks on concrete surface and increased permeation properties; for the chloride contaminated concretes, due to the limited extent of carbonation, permeation properties did not present obvious difference.

Original languageEnglish
Title of host publicationInternational Conference on Durability of Concrete Structures, ICDCS 2016
PublisherPurdue University Press
Pages317-327
Number of pages11
DOIs
Publication statusPublished - 30 Jun 2016
Event5th International Conference on Durability of Concrete Structures, ICDCS 2016 - Shenzhen, Guangdong Province, China
Duration: 30 Jun 201601 Jul 2016

Conference

Conference5th International Conference on Durability of Concrete Structures, ICDCS 2016
CountryChina
CityShenzhen, Guangdong Province
Period30/06/201601/07/2016

Keywords

  • Alkalinity
  • Carbonation
  • Chloride ions
  • Combined mechanism
  • Permeation properties
  • Relative humidity

ASJC Scopus subject areas

  • Building and Construction
  • Mechanics of Materials
  • Safety, Risk, Reliability and Quality
  • Materials Science(all)

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