Carbonation of ternary building cementing materials

The carbonation processes of ettringite and calcium aluminate hydrates phases developed by hydration of calcium aluminate cement, fly ash and calcium sulphate ternary mixtures have been studied. The hydrated samples were submitted to 4% of CO2 in a carbonation chamber, and were analysed, previous ca...

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Bibliographic Details
Published in:Cement & concrete composites 2012-11, Vol.34 (10), p.1180-1186
Main Authors: Fernández-Carrasco, Lucia, Torréns-Martín, D., Martínez-Ramírez, S.
Format: Article
Language:English
Subjects:
CAC
Calcium sulphate
Carbon dioxide
Carbonation
Cement
Cements
Ciment
Diffraction
Edificació
Ettringite
Fly ash
Hydration
Materials de construcció
Phases
Àrees temàtiques de la UPC
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Summary:The carbonation processes of ettringite and calcium aluminate hydrates phases developed by hydration of calcium aluminate cement, fly ash and calcium sulphate ternary mixtures have been studied. The hydrated samples were submitted to 4% of CO2 in a carbonation chamber, and were analysed, previous carbonation and after 14 and 90days of carbonation time, by infrared spectroscopy and X-ray diffraction; the developed morphology was performed with the 14days carbonated samples. The results evidenced that ettringite reacts with CO2 after 14days of exposition time and evolves totally at 90days; the developed hydrated phases C3AH6 in samples with major CAC content, also reacts with CO2. Due to carbonation, calcium carbonate – mainly vaterite but also aragonite-, depending on the initial formulation, aluminium hydroxide and gypsum were detected.
ISSN:0958-9465
1873-393X
DOI:10.1016/j.cemconcomp.2012.06.016