Concrete structures built by 3D printing technology is formed as the several concrete layers. Thus, 3D printing technology for concrete structure could have less strength than the design. In this study, fracture energy (fracture toughness) tests for layered concrete in various condition was performed. depending on required time for stacking new layer. Based on the results of performed tests, it was found that fracture energy was decreased due to increased non-bonded time

• 이재하(한국해양대학교 건설공학과 부교수, 공학박사) | Lee, Jaeha
• 정의석(한국해양대학교 토목환경공학과 석사과정) | Jeong, Euiseok
• 박상민(한국해양대학교 토목환경공학과 석사과정) | Park, Sangmin
• 김경진(한국해양대학교 토목환경공학과 박사과정) | Kim, Kyeongjin
• 김우석(충남대학교 토목공학과 부교수, 공학박사) | Kim, Wooseok 교신저자