Early-age Strength of CO2 Cured Alkali-activated Blast Furnace Slag Pastes

Author

Yubin Jun
Seong Ho Han, Missouri University of Science and TechnologyFollow
Jae Hong Kim

Abstract

The effect of CO₂ curing including pre-conditioning on alkali-activated slags, activated by different alkaline activators (NaOH, Na₂SiO₃, and KOH solution), is studied. While dry pre-conditioning before the CO₂ curing increases the strengths of all mixtures, the effect of pre-conditioning time is dependent on the alkali activator used to produce samples. The CO₃-bearing reaction product in samples also depends on the alkali activator. Gaylussite, pirssonite, hydrotalcite, and calcite are observed in the NaOH activator, and calcite, hydrotalcite, and C₄AcH₁₁ are detected in the NaOH and Na₂SiO₃ (9:1) mixture. The NaOH and Na₂SiO₃ (5:5) mixture yielded only calcite, and the KOH mixture produced calcite, hydrotalcite, and hydrocalumite. The most significant benefit of the CO₂ curing, in terms of the strength gain, of the samples is confirmed by the NaOH and Na₂SiO₃ mixture (5:5).

Recommended Citation

Y. Jun et al., "Early-age Strength of CO2 Cured Alkali-activated Blast Furnace Slag Pastes," Construction and Building Materials, vol. 288, article no. 123075, Elsevier, Jun 2021.

The definitive version is available at https://doi.org/10.1016/j.conbuildmat.2021.123075

Department(s)

Civil, Architectural and Environmental Engineering

Publication Status

Full Text Access

Comments

Ministry of Trade, Industry and Energy, Grant 20188550000580

Keywords and Phrases

Alkali-activated slag; Calcite; CO curing 2; CO -bearing phase 3; Pre-conditioning

International Standard Serial Number (ISSN)

0950-0618

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2025 Elsevier, All rights reserved.

Publication Date

21 Jun 2021