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김호림(Jin Hu-Lin),한민철(Han Min Cheol),고경택(Koh Kyoung-Taek),김도겸(Kim Do Gyum),한천구(Han Cheon-Goo) 한국구조물진단유지관리학회 2004 한국구조물진단학회 학술발표회논문집 Vol.- No.-
This paper reported the results of the fundamental properties and the effect of steel bar constraint using control mixture high performance concrete and mixture adjusted high performance concrete (HPC) For fresh concrete properties, both mixture met the target slump flow and air contents. Segregation reducing ratio exhibited more than 90%. Setting tune of HPC shortened by 6 hours compared with control concrete mixture HPC had higher compressive strength than control mixture concrete For HPC, stram with free shrinkage and constraint strain With reinforcing bar with Dl9mm and D25mm exhibited less than control mixture concrete by as much as 66%, 68% and 70%, respectively. Autogenous shrinkage stress had larger values With increase in contact area between bars and concrete. Autogenous shrinkage stress of HPC specimens constrained with reinforcing bars with diameter of Dl9mm and D25mm was reduced to 68% and 70%. respectively compared with control mixture concrete.
金虎林 ( Jin Hu-lin ),한민철 ( Han Min Cheol ),고경택 ( Koh Kyoung-taek ),김도겸 ( Kim Do Gyum ),한천구 ( Han Cheon-goo ) 한국구조물진단유지관리공학회 2004 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.8 No.2
This paper reported the results of the fundamental properties and the effect of steel bar constraint using control mixture high performance concrete and mixture adjusted high performance concrete (HPC). For fresh concrete properties, both mixture met the target slump flow and air contents. Segregation reducing ratio exhibited more than 90%. Setting time of HPC shortened by 6 hours compared with control concrete mixture. HPC had higher compressive strength than control mixture concrete. For HPC, strain with free shrinkage and constraint strain with reinforcing bar with D19mm and D25mm exhibited less than control mixture concrete by as much as 66%, 68% and 70%, respectively. Autogenous shrinkage stress had larger values with increase in contact area between bars and concrete. Autogenous shrinkage stress of HPC specimens constrained with reinforcing bars with diameter of D19mm and D25mm was reduced to 68% and 70%, respectively compared with control mixture concrete.
조명석 ( Cho Myung Suk ),송영철 ( Song Young-chul ),노재명 ( Noh Jea-myoung ),김도겸 ( Kim Do-gyum ) 한국구조물진단유지관리공학회 2006 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.10 No.2
It was proved of the performance and applicability of the organic and inorganic surface penetration supplement developed for aging prevention and durability performance by the used years of concrete structure through experimental method. This article synthesized an inorganic material, TEOS (tetra-ethoxyorthosilicate) and organic material, Acrylate monomer in a way of solution poly-condensation method, induced the performance betterment effect of concrete through the endurance performance improvement of silicate by sol-gel process, and the formation of a soft and flexible impact buffer layer by an organic monomer, and improved aging inhibition performance after concrete penetration by adding Isobutyl-orthosilicate as a performance improvement substance. The developed organic and inorganic surface penetration supplement refills concrete internal gap with physically, chemically stable compounds after penetration, has a high effect in increasing pressure strength by concrete reinforcement, improving durability to use environmental aging factors such as damage from sea wind, carbonation, freezing and fusing and multiple aging, so it is available as the effective life management technique of concrete structure.