Influence of the Type of Cement on the Formation of Calcium Carbonate Polymorphs due to Carbonation of Cement Materials

Abstract:

The objective of this study was to examine the influence of the type of cement on the formation of calcium carbonate CaCO₃ polymorphs after carbonation of cement materials. Thermogravimetric analysis and X-ray diffraction were used to follow mineralogical changes of CEM I and CEM II mortars and pastes which were submitted to an accelerated carbonation at 20% CO₂, 20°C and 65% relative humidity. The results indicated that aragonite and vaterite are formed from the carbonation of CEM II materials while these metastable polymorphs are not present in carbonated CEM I materials. It is likely that aragonite and vaterite are formed only at an advanced level of carbonation when pH is smaller than 9, which is the case of CEM I mortar and paste.

• Periodical: Applied Mechanics and Materials (Volume 529)
• Pages: 49-53
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.529.49
• Online since: June 2014
• Authors: Son Tung Pham*, William Prince
• Keywords: Calcium Carbonate, Carbonation, Thermogravimetric Analysis, X-Ray Diffraction (XRD)

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