실내 양생조건에서 석회 종류와 배합비 별 문화유산 수리․복원용 석회 모르타르의 역학적 특성 연구 = Mechanical Properties of Lime Mortars for Cultural Heritage Restoration Under Varying Mixing Ratios and Room Curing Conditions

국문 초록 (Abstract)

본 연구는 문화유산 수리․복원용 소석회(소괴, 분말, 시판)를 대상으로 실내조건(20℃, 60%)에서 배합비별 석회 모르타르의 역학적 특성을 연구하였다. 압축강도는 364일까지 증가하였고, 골재량 증가 및 시멘트 첨가에 따라 회귀선(선형모델)의 기울기가 감소하였다. 양생 364일의 압축강도는 소괴〈 분말〈 시판 소석회 순으로 BS EN 459-1(NHL) 기준에 부합하였고, 배합비(모래/석회)가 증가할수록 역학적 특성(탄성계수, 항복강도, 압축강도)은 감소하였다. 탄성한계 지표인 항복강도는 압축강도의 79∼100% 수준의 범위이다.

다국어 초록 (Multilingual 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 restorationof cultural heritage structures. Compressive strength increased over time, from initial curing to 8,736 hours or 364 days. As the aggregatecontent 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 strengthratio, lime mortar or standard strength, after 8,736 hours showed that lump hydrated lime corresponded to hydraulic lime classification, BSEN 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:NHL5. Additionally, the average strength ratio, yield strength or compressive strength indicated that the yield strength, representing the elasticlimit, ranged between 79 percent and 100 percent of the compressive strength. These findings can help predict the mechanical performance oflime mortar used in masonry, supporting more accurate planning for future cultural heritage restoration projects.