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Hwang D.J.,Korea Institute of Limestone and Advanced Materials | Hwang D.J.,Chungbuk National University | Yu Y.H.,Korea Institute of Limestone and Advanced Materials | Lee S.K.,Korea Institute of Limestone and Advanced Materials | And 5 more authors.
Korean Journal of Chemical Engineering | Year: 2012

Environment-friendly lime paints were prepared from 38 wt% slurries of hydrated lime (Ca(OH) 2) and hydrated light burned dolomite (Ca(OH) 2·Mg(OH) 2). These materials and the resulting paints' antibacterial and antimold properties were investigated. The hydrated lime used in this study contained 97 wt% Ca(OH) 2, which implies a 71. 85 wt% equivalence of CaO. This 71. 85 wt% CaO content was responsible for the antibacterial and anti-mold characteristics. The antibacterial and anti-mold characteristics of the hydrated light burned dolomite were attributed to its 56 wt% CaO and 44 wt% MgO contents. The antibacterial-reducing activities of 38 wt% hydrated lime and hydrated light burned dolomite slurries were found to be 99%. Their anti-mold activities against mixed strains were outstanding. Lime paints produced from the slurries and various additives also showed 99% antibacterial activity and outstanding anti-mold activity. The paints' low total volatile organic compounds (TVOCs) releases were graded as excellent. Their formaldehyde (HCHO) releases were classed as best through excellent, indicating their suitability as environment-friendly building materials. © 2012 Korean Institute of Chemical Engineers, Seoul, Korea. Source


Cho J.S.,Korea Institute of Limestone and Advanced Materials | Moon K.-Y.,Korea Institute of Limestone and Advanced Materials | Choi M.-K.,Korea Institute of Limestone and Advanced Materials | Cho K.-H.,Korea Institute of Limestone and Advanced Materials | And 2 more authors.
Journal of the Korean Ceramic Society | Year: 2014

Natural hydraulic lime (NHL) is produced by burning a form of low-grade limestone containing silica and alumina which, above certain temperatures, combine with calcium oxide. The resulting silicates and aluminates impart hydraulic properties to the product. This study aims to determine the calcined characteristics of NHL using domestic low-grade limestone with maximized hydraulic properties. Six types of low-grade limestone containing SiO 2 were selected and experiments were carried out with different burning temperatures and holding times. The burning temperature and holding time as the most suitable burning conditions were 1,200°C to 1,300°C and 3 to 7 h, respectively, for the manufacturing of NHL from domestic low-grade limestone. These results demonstrate the feasibility of NHL using domestic low-grade limestone to produce NHL. Source


Moon K.-Y.,Korea Institute of Limestone and Advanced Materials | Choi M.-K.,Korea Institute of Limestone and Advanced Materials | Cho K.-H.,Korea Institute of Limestone and Advanced Materials | Cho J.-S.,Korea Institute of Limestone and Advanced Materials | And 2 more authors.
Journal of the Korean Ceramic Society | Year: 2014

The main mineral phases of natural hydraulic lime (NHL) as a hydraulic lime binderare Ca(OH)2, C2S, C3S, C3A, and SiO2 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, CACO3, C2S, and SiO2 residues, while in the case of foreign-sourced NHL, a small amount of an aluminium hydration phase formed. Also, the CACO3 content after the carbonation reaction increased with an increase in the curing time. After hydration for 28 days, NHL containing considerable amounts of C2S and C3S showed higher carbonation ratios than others types. Source


Moon K.-Y.,Korea Institute of Limestone and Advanced Materials | Choi M.-K.,Korea Institute of Limestone and Advanced Materials | Cho J.-S.,Korea Institute of Limestone and Advanced Materials | Cho K.-H.,Korea Institute of Limestone and Advanced Materials | Ahn J.-W.,Korea Institute of Geoscience and Mineral Resources
Journal of the Korean Ceramic Society | Year: 2016

This study aims to produce dolomitic hydraulic lime (D-NHL) using domestic low grade dolomitic limestone and to determine the effect of adding blast furnace slag (BFS) and gypsum as part of an investigation of the hydration properties of D-NHL to increase the mechanical properties. The main mineral phases of D-NHL as a hydraulic lime binder were Ca(OH)2, Mg(OH)2, C2S, C3S, and MgO residues. Ca(OH)2 transformed into CaCO3 in D-NHL paste over the period of 28 days, but the carbonation of Mg(OH)2 and the hydration of C2S did not occur until hydration, after 28 days. Through an investigation of the hydration properties of D-NHL pastes mixed with BFS and gypsum, Al-based compounds such as calcium aluminate hydrates (C4AH13) and ettringite were observed at early hydration time. The compressive strength was improved due to the increased quantities of these hydration products. These results show that good performance results from the application of dolomitic hydraulic lime and that a high value product can be made from domestic waste materials. © 2012 All Right Reserved. Source


Moon K.-Y.,Korea Institute of Limestone and Advanced Materials | Moon K.-Y.,Korea National University of Transportation | Cho J.-S.,Korea Institute of Limestone and Advanced Materials | Choi M.-K.,Korea Institute of Limestone and Advanced Materials | And 4 more authors.
Journal of Ceramic Processing Research | Year: 2016

Natural hydraulic lime (NHL) has gained a great deal of attention as an eco-friendly construction material, but its application has remained very limited due to its insufficient mechanical properties. The addition of mineral admixture to NHL has been considered as a means of addressing this drawback and improving the mechanical properties for future commercialization. The effects of adding a mineral admixture such as blast furnace slag (BFS) or anhydrite (AH) to NHL on the hydration properties were systematically investigated in this study. Local Korean NHL (K-NHL) was synthesized using domestic lowgrade limestone. The hydration properties of the NHL products were then investigated as a function of the hydration time and the addition ratio of inorganic additives. Through an investigation of the hydration properties of NHL pastes mixed with BFS and AH, Al-based compounds such as calcium aluminate hydrates (C4AH13) and ettringite (3CaO • Al2O3 • 3CaSO4 • 32H2O) were observed at early hydration time. The formation of calcium silicate hydrates (C-S-H) increased with enlargement of the amount of inorganic additives. The compressive strength and setting time were improved due to increased quantities of these hydration products. © 2016, Hanyang University. All rights reserved. Source

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