Non-destructive test is using rebound hardness and ultrasonography generally. They generate a difference with Core compressive strength in estimation of compressive strength because they are indirectly. Therefor, Inter-rater Reliability analysis was performed to evaluate the reliability of Non-destructive Method. Reliability analysis, while there is correlation two times only between the rebound hardness method and Core compressive strength in total eight cases but ultrasonography method has six times. so ultrasonography method is more reliable than Rebound hardness method.

• 박진우(한국시설안전공단 사원) | Park, Jin-Woo 교신저자
• 오달수(한국시설안전공단 과장) | Oh, Dal-Su
• 주형석(한국시설안전공단 차장) | Ju, Hyeong-Seok
• 이상철(한국시설안전공단 특수교목포지역센터장) | Lee, Sang-Cheol