In case of measuring strength of concrete using ultrasonic pulse testing, setting reasonable range of limitations to get reliable strength data results is highly recommended. To resolve this issue, ultrasonic testings were performed on several concrete specimens ,randomly selected and contain strength ranged from 20 to 200MPa, to measure values of ultra sonic velocity and actual strength. Then advanced data analyses were performed based on the results from the experimental works.

• 박성우(삼성물산(주) 건설부문 기술연구센터 수석 연구원) | Park, Sung Woo
• 강동수(삼성물산(주) 건설부문 기술연구센터 시험동 연구원) | Kang, Dong Su