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Carbonation of Blended Binders Containing Metakaolin

  • R. BucherEmail author
  • M. Cyr
  • G. Escadeillas
Conference paper
Part of the RILEM Bookseries book series (RILEM, volume 10)

Abstract

The pozzolanic materials are often recommended for their very good durability in aggressive environment. Unfortunately, this is not always true and particularly in the case of carbonation by the atmospheric CO2. Although cement replacement by pozzolanic materials causes a decrease in pore size, the pozzolanic reaction consumes portlandite and decreases the protection potential against CO2 ingress. This is the case for most pozzolanic materials, including metakaolin. The aim of this study is first to confirm the literature results of carbonation by using flash metakaolin in partial replacement of cements (CEM I, CEM II A-LL and CEM II A-V). Then the concretes with a metakaolin are compared with concretes based on standardized cement in order to assess the carbonation depth of metakaolin-based concretes and concretes used today in the building construction. Even though the cement replacement of CEM I and CEM II A-V by metakaolin increases the carbonation depth, results are not the same with the CEM II A-LL cement. The interaction of metakaolin with the cement limestone filler can explain this better performance, certainly because the hemicarboaluminate allows slowing down the CO2 propagation through the matrix.

Keywords

Pozzolanic Reaction Blended Cement Natural Carbonation Carbonation Depth Cement Replacement 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© RILEM 2015

Authors and Affiliations

  1. 1.LMDCUPS—INSA ToulouseToulouseFrance

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