Comparison between natural and accelerated carbonation (3% CO2): Impact on mineralogy, microstructure, water retention and cracking

The consequences of accelerated carbonation at 3% CO2 were compared with those of natural carbonation (0.04%). Cement pastes (CEM I and CEM V/A) as well as the three major constitutive phases (C-S-H of different C/S ratios, portlandite and ettringite) were used and changes in the mineralogy, microst...

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Bibliographic Details
Published in:Cement and concrete research 2018-07, Vol.109, p.64-80
Main Authors: Auroy, Martin, Poyet, Stéphane, Le Bescop, Patrick, Torrenti, Jean-Michel, Charpentier, Thibault, Moskura, Mélanie, Bourbon, Xavier
Format: Article
Language:English
Subjects:
Acceleration (A)
ARAGONITE
CALCITE
Calcium carbonate
CALCIUM CARBONATES
Carbon
CARBON DIOXIDE
Carbonation
Carbonation (C)
Cement paste
CEMENTS
Characterization (B)
Chemical Sciences
Corrosion
CRACKS
Ettringite
Material chemistry
MATERIALS SCIENCE
MICROSTRUCTURE
Microstructure (B)
MINERALOGY
RETENTION
WATER
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Summary:The consequences of accelerated carbonation at 3% CO2 were compared with those of natural carbonation (0.04%). Cement pastes (CEM I and CEM V/A) as well as the three major constitutive phases (C-S-H of different C/S ratios, portlandite and ettringite) were used and changes in the mineralogy, microstructure, water retention and cracking were investigated. The main conclusion was that accelerated carbonation at 3% CO2 was representative of natural carbonation although it promoted the precipitation of metastable calcium carbonate (aragonite and vaterite) in place of calcite. The results also showed that the presence of aragonite and vaterite were characteristic of the carbonation of ettringite and C-S-H respectively.
ISSN:0008-8846
1873-3948
DOI:10.1016/j.cemconres.2018.04.012