Carbonation reactivity of wollastonite enhanced by incorporating sodium-based alkali additives

초록

The carbonation of wollastonite presents a promising approach for CO2 sequestration and the development of sustainable cementitious materials. This study investigates the enhancement of wollastonite carbonation through the incorporation of sodium-based additives (Na2CO3 and NaHCO3) under carbonation curing conditions. X-ray diffraction analysis revealed that increasing the dosage of Na₂CO₃ and NaHCO₃ facilitated wollastonite dissolution and promoted calcite formation. Thermogravimetric analysis confirmed that bound CO2 content was significantly high in carbonated samples, especially when containing NaHCO3 at dosages of 3%. Thermodynamic modeling further indicated that wollastonite carbonation led to the formation of calcium-silicate-hydrate alongside minor phases such as magnesium-silicate-hydrate and hydrotalcite. These findings suggest that sodium-based alkali additives are an effective promoter of wollastonite dissolution and carbonation, enhancing CO2 sequestration efficiency and contributing to the development of low-carbon cementitious materials.

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