고강도 혼합재를 활용한 프리캐스트 콘크리트의 압축강도 특성 = Compressive Strength Characteristics of Precast Concrete Using High-Strength Admixtures

다국어 초록 (Multilingual Abstract)

This study evaluated the mechanical properties of precast concrete incorporating varying replacement ratios of high-strength admixtures. The replacement ratios of the high-strength mixtures were set at 10%, 20%, and 30%. Slump, air content, compressive strength, and drying shrinkage were measured as key performance indicators. Furthermore, microstructure, crystallography, and thermal characteristics were analyzed. As the replacement ratio of the high-strength admixture increased, both the slump and compressive strength increased. In contrast, drying shrinkage decreased with higher replacement levels. When the replacement ratio exceeded 20%, the early-age specimens exhibited expansion behavior, accompanied by the notable formation of ettringite. Moreover, the use of high-strength admixture promoted the development of portlandite and calcium silicate hydrate (C-S-H) phases, resulting in a denser matrix with reduced internal porosity, thereby enhancing compressive strength. The results confirmed that incorporating high-strength admixtures into precast concrete improves both drying shrinkage and compressive strength performance. Therefore, high-strength admixtures show potential for use as eco-friendly components in precast concrete production.