Internal carbonation of belite-rich Portland cement: An in-depth observation at the interaction of the belite phase with sodium bicarbonate

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The potential for the internal carbonation of belite-rich Portland cement with the addition of sodium bicarbonate is proposed in the present study with a particular observation of the microstructural evolution of the belite phase. Cement paste samples having additional dosages of NaHCO3 of 0, 1, 2, and 5 wt% were fabricated and characterized by means of X-ray diffractometry, pH measurements, thermogravimetry analyses, isothermal calorimetry, and solid-state 29Si nuclear magnetic resonance spectroscopy. The test results indicated that the CO2 released from the added NaHCO3 was uniformly dissolved in the matrix, facilitating internal carbonation. In addition, the formation of C–S–H was further promoted upon the incorporation of NaHCO3, signifying a reaction of belite with the NaHCO3. Isothermal calorimetry results confirmed that the NaHCO3 enhanced the early reaction kinetics. Meanwhile, the pH value of the samples increased due to the anion exchange between the NaHCO3 and Ca(OH)2.
Publisher
ELSEVIER
Issue Date
2021-12
Language
English
Citation

JOURNAL OF BUILDING ENGINEERING, v.44, pp.102907

ISSN
2352-7102
DOI
10.1016/j.jobe.2021.102907
URI
http://hdl.handle.net/10203/287110
Appears in Collection
CE-Journal Papers(저널논문)
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