나노실리카 혼입 OPC 시멘트 페이스트의 촉진 탄산화 양생 특성 평가

초록

This study investigated the effects of nanosilica(NS, 1–5wt%) on the accelerated carbonation curing (ACC) characteristics of Ordinary Portland Cement(OPC) paste. Compressive strength and carbonation depth were measured, and thermogravimetric analysis(TGA), X-ray diffraction(XRD), and scanning electron microscopy(SEM) image analyses were performed. The NS3 specimen showed the highest compressive strength, carbonation depth, CaCO3 formation, and calcite content, indicating effective pore-filling and microstructural densification. In contrast, NS5 showed reduced carbonation reactivity and relatively high levels of residual hydration products and porosity. Therefore, the optimal NS dosage under ACC conditions was determined to be 3wt%.

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