A modified pullout tester using a post-installable break-off bolt is presented. For the purpose of the this research, a test was conducted on normal concrete(24MPa) to measure the compressive strength and pullout load. It was found that the correlation between compressive strength and pullout load is very obvious and the modified pullout tester is a useful method to evaluate concrete strength.

• 고훈범(인하공업전문대학 건축과 교수, 공학박사) | Ko, Hune Bum
• 차은호(인하대학교 건축공학과, 석사과정) | Cha, Eun Ho
• 오강환(인하대학교 건축공학과, 석사과정) | Oh, Kang Hwan