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J. Korean Ceram. Soc. > Volume 51(2); 2014 > Article
Journal of the Korean Ceramic Society 2014;51(2): 72.
doi: https://doi.org/10.4191/kcers.2014.51.2.72
수경성석회 종류에 따른 수황 및 탄산화 특성
문기연, 최문관, 조계홍, 조진상, 안지환1, 연규석2
한국석회석신소재연구소 연구개발실
1한국지질자원연구원 광물자원본부
2강원대학교 지역건설공학과
Hydration and Carbonation Properties of Different Hydraulic Lime
Ki-Yeon Moon, Moon-Kwan Choi, Kye-Hong Cho, Jin-Sang Cho, Ji-Whan Ahn1, Kyu-Seok Yeon2
Department of Research and Development, Korea Institute of Limestone and Advanced Materials
1Mineral Resources Research Division, Korea Institute of Geoscience and Mineral Resources
2Department of Regional Infrastructure Engineering, Kangwon National University
The main mineral phases of natural hydraulic lime (NHL) as a hydraulic lime binderare $Ca(OH)_2$, $C_2S$, $C_3S$, $C_3A$, and $SiO_2$ residues. Also, NHL has the characteristic of setting and hardening by a hydration reaction with water and by carbonation reactions with carbon dioxide from the air. In this study, in an effort to investigate changes of the mineral phases by NHL hydration and carbonation reactions, transitions of mineral phases and the microstructures of hardened pastes were analyzed by XRD, DSC, SEM, and by pore size distributions using domestic and foreign-sourced NHL pastes after curing at 1, 3, 7, and 28 days. On the basis of the analysis results, it was confirmed that domestic low-grade limestone can be used for the manufacturing of NHL. The main hydration mineral phases were $Ca(OH)_2$, $CaCO_3$, $C_2S$, and $SiO_2$ residues, while in the case of foreign-sourced NHL, a small amount of an aluminium hydration phase formed. Also, the $CaCO_3$ content after the carbonation reaction increased with an increase in the curing time. After hydration for 28 days, NHL containing considerable amounts of $C_2S$ and $C_3S$ showed higher carbonation ratios than others types.
Key words: Natural hydraulic lime, Hydration properties, Carbonation, Low grade limestone
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