| Title |
Effects of Amount of Slaking Water on Physical and Chemical Properties of Handmade Hydrated Lime used for Preservation of Architectural Heritage |
| Authors |
Kang, Sung-Hoon ; Hwang, Jong-Kook ; Kwon, Yang-Hee |
| DOI |
https://doi.org/10.5659/JAIK_SC.2019.35.2.21 |
| Keywords |
Quicklime ; Hydrated lime ; Slaking method ; Architectural heritage ; Calcium hydroxide ; Thermogravimetric analysis |
| 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 ℃ 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. |