CHARACTERISTICS OF THE TRADITIONAL KOREAN LIME PLASTER AFTER AN ADDITION OF PERILLA OIL
Authors: Kang Sanha , Kang Soyeong 
Published: October 2022

Ancient Kor

Ancient Korean records indicate that a variety of organic materials (straw, hanji, sticky rice, oil, etc.) used to be added to lime for different purposes, including the preservation and repair of monuments. In this study, aerial lime plaster with perilla oil was produced. Before the sample preparation, a flow test was performed: lime was kneaded at various ratios of mixing water and perilla oil to better understand the physical transformation of the material. After perilla oil was added, the fluidity of the lime putty was decreased, allowing adjustments in the workability. Using the Uigwe as the reference, lime samples with perilla oil were prepared. As even a small amount of perilla oil can cause color changes in the lime material, it is important to control the amount of perilla oil added to the lime putty. Furthermore, the material became resistant to moisture. As freezing and thawing due to the moisture content are the main causes of damage to lime materials, it was believed that the addition of perilla oil can improve their performance. Neutralization tests, µ-CT imaging and an XRD analysis were performed to investigate the carbonation of the lime materials. The test results revealed that when perilla oil was added to the material, the carbonation was delayed; furthermore, the strength of the material decreased initially but increased gradually as the curing progressed. This study suggests that perilla oil can be added to lime to improve its freeze-thaw resistance, which will be helpful in the maintenance of monuments.

an records indicate that a variety of organic materials (straw, hanji, sticky rice, oil, etc.) have been added to lime for different purposes, including the preservation and repair of monuments. In this study, an aerial lime plaster sample with perilla oil was produced. Before sample preparation, a flow test was performed, lime was kneaded under various ratios of mixing water and perilla oil to better understand the physical transformation of the material. After perilla oil was added, fluidity of the lime putty was decreased, which allowed for adjustments in the workability. Using the Uigwe as a reference, lime samples with perilla oil were prepared. As even a small amount of perilla oil can cause color changes in the lime material, thus it is important to control the amount of perilla oil added to the lime putty.  Furthermore, the material became resistant to moisture. As freezing and thawing due to moisture content are the main causes of damage to lime materials, it was believed that the addition of perilla oil can improve their performance. Neutralization tests, μ-CT imaging, and XRD analysis were performed to investigate the carbonation of the lime materials. The test results revealed that when perilla oil was added to the material, the carbonation was delayed; furthermore, the strength of the material decreased initially but increased gradually as curing progressed. This study suggests that perilla oil can be added to lime to improve the freeze-thaw resistance of the lime, which will be helpful in the maintenance of monuments.