The microstructure and strength of carbonated aluminous cements

The effect of carbonation on the microstructure and flexural strength of hardened aluminous cement pastes has been investigated. It is found that pastes containing either C3AH*6 or CAH10 as the major crystalline hydrate phase are readily partially carbonated at a humidity of 72.6%. The carbonation p...

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Bibliographic Details
Published in:Journal of materials science 1997, Vol.32 (23), p.6249-6253
Main Authors: HENRY, B. M, KILMARTIN, B. A, GROVES, G. W
Format: Article
Language:English
Subjects:
Aluminous cements
Aluminum oxide
Applied sciences
Buildings. Public works
Calcite
Carbonation
Cement concrete constituents
Cement paste
Cements
Crystallites
Exact sciences and technology
Flexural strength
Materials
Materials science
Microstructure
Properties and test methods
Properties of anhydrous and hydrated cement, test methods
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Summary:The effect of carbonation on the microstructure and flexural strength of hardened aluminous cement pastes has been investigated. It is found that pastes containing either C3AH*6 or CAH10 as the major crystalline hydrate phase are readily partially carbonated at a humidity of 72.6%. The carbonation products are calcite, vaterite, which is present as 50 nm crystallites, and hydrous alumina, which is always produced in the form of an amorphous gel. Partial carbonation produces a modest increase in the flexural strength for pastes containing either C3AH6 or CAH10.
ISSN:0022-2461
1573-4803
DOI:10.1023/A:1018637127428