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논문 기본 정보

자료유형
학술저널
저자정보
Yubin Jun (Korea Advanced Institute of Science and Technology) Seong Ho Han (Korea Advanced Institute of Science and Technology) Jae Hong Kim (Korea Advanced Institute of Science and Technology)
저널정보
한국콘크리트학회 International Journal of Concrete Structures and Materials International Journal of Concrete Structures and Materials Vol.17 No.2
발행연도
2023.3
수록면
345 - 355 (11page)

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초록· 키워드

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This study investigated the efficiency of CO₂ curing in blast-furnace slag pastes activated with three concentrations of KOH solution (3, 4, and 5 M). The CO₂ curing was applied into the alkali-activated slag paste for 3 days. The CO₂-cured pastes were subjected to subsequent curing in a water bath or exposed to seawater. The mechanical properties and characteristics of the reaction products were compared. Full strength can be obtained within 3 days of the early CO₂ curing. The strength remained almost constant regardless of the activator concentration. The CO₂-cured samples produced more CaCO₃ after exposure to the seawater. The carbonates filled the micropores of the samples, and no strength reduction was observed. The hydrates Ca(OH)₂ and C–S–H(I) are carbonated, forming calcite and amorphous CaCO₃ during the subsequent curing and exposure to seawater as well as the CO₂ curing. A less dense matrix with a lower activator concentration facilitated the diffusion of CO₂ and promoted early carbonation in the paste. The polymerization of C–S–H(I) was relatively slow with low activity, and within the period of CO₂ curing, more carbonates were produced in the sample prepared at a low activator concentration.

목차

Abstract
1 Introduction
2 Experimental Program
3 Results and Discussion
4 Conclusions
References

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