For the purpose of evaluating the strength of high-strength concrete, the strength of small diameter core was compared with 100, 50, and 30 mm cores. In case of high strength concrete, the smaller the core diameter, the lower the strength was. It is probably due to the disturbance of specimen during coring. Therefore, it is considered that it is difficult to apply in the field.

• 오광진(한국시설안전공단, 건설안전실 건설평가팀) | Oh, KwangChin
• 윤국현(한국시설안전공단, 건설안전실 건설평가팀) | Yun, KukHyun
• 신주열(한국시설안전공단, 건설안전실 건설평가팀) | Shin, juyeoul
• 오홍섭(경남과학기술대학교, 토목공학과 교수, 공학박사) | Oh, Hongseob