Effect of alkalis on enforced carbonation of cement paste: Mechanism of reaction

Maciej Zajac; Jørgen Skibsted; Mohsen Ben Haha

doi:10.1111/jace.17481

journal article Oct 26, 2020

Effect of alkalis on enforced carbonation of cement paste: Mechanism of reaction

Maciej Zajac

Jørgen Skibsted Mohsen Ben Haha

Journal of the American Ceramic Society Vol. 104 No. 2 pp. 1076-1087 · Wiley

View at Publisher Save 10.1111/jace.17481

Abstract

Abstract
In the present research, an alternative approach to produce supplementary cementitious materials (SCMs) based on the carbon capture and utilization is developed. The approach focuses on enforced carbonation of cement pastes obtained from recycled concrete and its application as SCM. This work focuses on the effect of alkalis in the starting solution on the carbonation mechanism of ground hydrated cement pastes in a wet reactor. The enforced carbonation of cement paste is a rapid process at ambient temperature and pressure being close to complete reaction within a few hours of carbonation, independently on alkali concentration. However, alkalis have a complex impact on the carbonation reaction as they accelerate the initial stages of the carbonation reaction, while the kinetics of the middle stages is retarded. The final degree of carbonation is only slightly affected by the alkali concentration in the solution. The origin of these effects can be explained by relating them to the evolution of solid and solution properties. Additionally, the alkali concentration has an impact on the morphology of the main carbonation products, that is, calcite and the alumina‐silica gel.

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References

Details

Published: Oct 26, 2020
Vol/Issue: 104(2)
Pages: 1076-1087
License: View

Authors

M

Maciej Zajac

Global R&D HeidelbergCement AG Leimen Germany

J

Jørgen Skibsted

Department of Chemistry and Interdisciplinary Nanoscience Center (iNANO) Aarhus University Aarhus C Denmark

M

Mohsen Ben Haha

Global R&D HeidelbergCement AG Leimen Germany

Cite This Article

Maciej Zajac, Jørgen Skibsted, Mohsen Ben Haha (2020). Effect of alkalis on enforced carbonation of cement paste: Mechanism of reaction. Journal of the American Ceramic Society, 104(2), 1076-1087. https://doi.org/10.1111/jace.17481

Effect of alkalis on enforced carbonation of cement paste: Mechanism of reaction

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