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http://dx.doi.org/10.4191/kcers.2014.51.2.72

Hydration and Carbonation Properties of Different Hydraulic Lime  

Moon, Ki-Yeon (Department of Research and Development, Korea Institute of Limestone and Advanced Materials)
Choi, Moon-Kwan (Department of Research and Development, Korea Institute of Limestone and Advanced Materials)
Cho, Kye-Hong (Department of Research and Development, Korea Institute of Limestone and Advanced Materials)
Cho, Jin-Sang (Department of Research and Development, Korea Institute of Limestone and Advanced Materials)
Ahn, Ji-Whan (Mineral Resources Research Division, Korea Institute of Geoscience and Mineral Resources)
Yeon, Kyu-Seok (Department of Regional Infrastructure Engineering, Kangwon National University)
Publication Information
Journal of the Korean Ceramic Society / v.51, no.2, 2014 , pp. 72-81 More about this Journal
Abstract
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.
Keywords
Natural hydraulic lime; Hydration properties; Carbonation; Low grade limestone;
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