Journal of the Architectural Institute of Korea Structure & Construction (대한건축학회논문집:구조계)

Architectural Institute of Korea (대한건축학회)
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Effects of Amount of Slaking Water on Physical and Chemical Properties of Handmade Hydrated Lime used for Preservation of Architectural Heritage

소화에 사용되는 물의 양이 건축 문화재 보존용 수제 소석회의 물리 및 화학적 특성에 미치는 영향

  • 강성훈 (서울대학교 건축학과 및 공학연구원) ;
  • 황종국 (한국전통문화대학교 전통건축학과) ;
  • 권양희 (한국전통문화대학교 전통건축학과)
  • Received : 2018.12.15
  • Accepted : 2019.01.28
  • Published : 2019.02.28
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Abstract

Handmade hydrated lime has been used for preservation and repair of architectural heritage in Korea. However, the effect of the amount of water used for slaking quicklime on the physical and chemical properties of the hydrated lime, which is the result of the slaking process, has not been clearly understood. In this study, particle size distribution, chemical composition and crystalline phases of the hydrated lime are investigated by varying the amount of water used for the slaking. In addition, temperature history during the slaking process is examined. For this, various experiments, such as laser diffraction analysis, X-ray fluorescence, X-ray diffraction, thermogravimetric analysis, and temperature recording using a thermocouple, were performed. When the quicklime came into contact with water, its temperature reached $100^{\circ}C$ within 10 min due to sudden exothermic reaction of calcium oxide, and this temperature was maintained for about 30 min. The water to lime ratio influenced the cooling rate during the slaking process; that is, the more water was used, the longer it took to reach an ambient temperature. The amount of water for the slaking did not have a noticeable effect on the contents of major components of the hydrated lime such as calcium hydroxide and calcium carbonate, but when slaked with more amount of water, average particle size of the lime tended to decrease. The experimental results in this study can be used as references for developing guidelines on the safety or appropriate amount of water in the lime slaking process.

Keywords

Acknowledgement

Supported by : 한국전통문화대학교 대학원

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