질산은을 활용한 시멘트 염소이온 저감 혼화 재료 개발을 위한 기초 실험 연구

초록

This study aims to conduct preliminary experiments to support the development of chloride-reducing admixtures for cementitious materials. Silver nitrate (AgNO3) was used not as an actual admixture but as a chemical probe to explore chloride binding mechanisms. Initially, Potentiometric titration were conducted to quantify the reduction of chloride ions when AgNO3 was added to a 1000 ppm NaCl solution. Based on these results, paste and mortar specimens were prepared with mixing water replaced by a 500 ppm NaCl solution, and various amounts of AgNO3 were added to simulate binding conditions. Chloride content in paste was analyzed using acid- and water-soluble extraction methods, and the flexural and compressive strengths of mortar were measured at 3 and 7 days. Results showed that increasing AgNO3 content led to a notable decrease in chloride ions. While flexural strength tended to decline slightly, compressive strength at 7 days remained relatively stable. Future research will focus on long-term strength development, SEM/EDS microstructural analysis, and durability testing under chloride exposure. These findings suggest that AgNO3 can serve as an effective experimental probe for developing chloride-fixing admixtures.

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