| Title |
Mechanical Properties of Lime Mortars for Cultural Heritage Restoration Under Varying Mixing Ratios and Room Curing Conditions |
| Authors |
남병직(Nam, Byeong-Jik) ; 강소영(Kang, So-Yeong) |
| DOI |
https://doi.org/10.5659/JAIK.2025.41.5.263 |
| Keywords |
Room Curing; Lime Mortar; Mixing Ratio; Elastic Modulus; Yield Strength; Compressive Strength |
| Abstract |
This study examined the mechanical properties of lime mortar based on different mixing ratios, using various types of hydrated lime: lump,
powder, and commercial, under room curing conditions of 20°C, 60 percent. These materials are commonly used in the repair and restoration
of cultural heritage structures. Compressive strength increased over time, from initial curing to 8,736 hours or 364 days. As the aggregate
content increased, lime:sand ratios from 1:1 to 1:3, and cement was added, the slope of the regression line, based on a linear model,
decreased. After 8,736 hours of curing, the elastic modulus, yield strength, and compressive strength followed the order: lump, powder,
commercial hydrated lime. Higher sand-to-lime ratios resulted in lower mechanical performance. Analysis of the average compressive strength
ratio, lime mortar or standard strength, after 8,736 hours showed that lump hydrated lime corresponded to hydraulic lime classification, BS
EN 453.9-1:NHL 2, powder hydrated lime to BS EN 459-1:NHL 3.5, and commercial hydrated lime met the standard for BS EN 459-1:NHL
5. Additionally, the average strength ratio, yield strength or compressive strength indicated that the yield strength, representing the elastic
limit, ranged between 79 percent and 100 percent of the compressive strength. These findings can help predict the mechanical performance of
lime mortar used in masonry, supporting more accurate planning for future cultural heritage restoration projects. |