| Title |
Performance and Compatibility of Lime Mortar for Architectural Heritage Repair and Restoration Based on White Cement Type and Replacement Ratio |
| Authors |
김준하(Kim, Jun-Ha) ; 강성훈(Kang, Sung-hoon) ; 권양희(Kwon, Yang-Hee) |
| DOI |
https://doi.org/10.5659/JAIK.2026.42.10.385 |
| Keywords |
Architectural Heritage; Lime Mortar; White Cement; Replacement Ratio; Freeze-Thaw Resistance; Compatibility |
| Abstract |
This study evaluates the performance and compatibility of lime mortar for architectural heritage repair and restoration according to the type
and replacement ratio of white cement. Lime mortars were prepared by partially replacing lime with exterior or interior white cement at
replacement ratios of 0% (reference mortar), 13%, 25%, 50%, 75%, and 100%. The mortars were evaluated for flowability, weight and length
changes, compressive and flexural strength, freeze-thaw resistance, and color characteristics. As the cement replacement ratio increased, the
water-to-binder ratio required to achieve the target flow decreased, while weight loss and drying shrinkage were reduced. Compressive and
flexural strength, as well as freeze-thaw resistance, improved with increasing replacement ratio, with exterior white cement producing greater
improvements than interior white cement. However, high replacement ratios, particularly 50% or more of exterior white cement, resulted in
strength levels that exceeded those generally considered compatible with heritage repair materials, increasing the risk of incompatibility with
original substrates. At the standard replacement ratio of 13%, exterior white cement provided greater improvements in strength and
freeze-thaw resistance than interior white cement. Color differences from the reference mortar remained relatively small but approached the
threshold of visual perception over time. These findings suggest that the selection of white cement for heritage repair mortar should consider
compatibility with original materials as well as the required mechanical performance, rather than focusing solely on strength enhancement. |