The core is extracted to evaluate the concrete compressive strength of the actual structure. However, the core strength can vary in the core size due to two reasons - size effect in fracture mechanics and effect of coring damage. Therefore, the purpose of this study was to assess quantitatively the difference in strength due to these effects. The core damage tended to increase relatively as the core section was smaller. The strength difference due to the size effect in fracture mechanics did not show any significant difference according to the curing condition and was measured to be similar to the previous study.

Abstract
 1. 서 론
 2. 실험 계획
 3. 실험 결과 및 분석
 4. 결 론

• 조선두(명지대학교 토목환경공학과) | Jo Seon Doo
• 권승희(명지대학교 토목환경공학과) | Kwon Seung Hee
• 김철영(명지대학교 토목환경공학과) | Kim Chul Young
• 박영석(명지대학교 토목환경공학과) | Park Young suk