In this study, it was evaluated the early-strength of mock-up concrete by replacement of the flyash after it was ground by vibration mill and was modified chemically. Also, the early-strength of the specimens for maintaining structure was evaluated on the first, second, third day separately.

• 정상현((주)포스코건설 기술연구소 인프라연구그룹, 선임연구원) | Cheong, Sang Hyeon
• 안상구((주)포스코건설 기술연구소 인프라연구그룹, 수석연구원) | Ahn, Sang Ku
• 강현진((주)삼표, 혼화제사업부, 대리) | Kang, Hyun Jin
• 안태호((주)삼표, 혼화제사업부, 사원) | An, Tae Ho
• 전용수((주)삼표, 혼화제사업부, 부장(공장장)) | Jeon, Young Su