In this study, specimens were produced to reach design standard strengths 40, 50 and 60MPa on age 28 days to evaluate the usability of high strength recycled aggregate concrete and the applicability of compressive strength by Impact Echo method and numerical analysis, and after 0, 30, 50 and 100% recycled coarse aggregates were substituted and mixed into each combination, totally 12 combinations were set. And, through compressive strength test, Impact Echo method, shock reverberation technique and numerical analysis on 1, 3, 7 and 28 days of age

• 홍성욱(정회원, 한밭대학교 건축공학과 연구교수) | Hong, Seong Uk
• 백상기(정회원, 강산건축사사무소 소장) | Back, Sang Ki
• 조영상(정회원, 한양대학교 건축학부 교수) | Cho, Young Sang
• 김승훈(정회원, 한밭대학교 건축공학과 부교수) | Kim, Seung Hun
• 이용택(정회원, 한밭대학교 건축공학과 교수) | Lee, Yong Taeg