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해양 환경하에 의한 철근콘크리트구조물의 보수공법 종류에 따른 철근부식특성
조봉석 ( Cho Bong Suk ),김영선 ( Kim Young Sun ),장재봉 ( Jang Jae Bong ),김영덕 ( Kim Young Duck ),김재환 ( Kim Jae Hwan ),김무한 ( Kim Moo Han ) 한국구조물진단유지관리공학회 2005 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.9 No.1
In this study, for the establishment of the performance evaluation methods and the quality control standards of durability recovery method, the quantitative exposure data by long term exposure test under the coast is accumulated and analyzed. Investigating and evaluating the result of exposure test at 24 month of exposure age under the coastal environment,carbonation and salt damage are not happened at all but the difference in electric potential are found. Therefore, it is considered to be applied as the fundamental data on the performance evaluation and quality control standards of repair material and method through continuous exposure test in the future.
고로슬래그 혼합 시멘트 페이스트의 응결시간 경과에 따른 레올로지 특성
조봉석 ( Cho Bong-suk ),안재철 ( Ahn Jae-cheol ),박동천 ( Park Dong-cheon ) 한국건축시공학회 2016 한국건축시공학회지 Vol.16 No.6
Even though high performance concrete was developed according to the trend of bigger and higher of reinforced concrete building, the rheological evaluations such as viscosity, yield stress are not enough to use as input data to accomplish the numerical analysis for the construction design. So there are many problems in the harden concrete such as poor compaction, rock pocket and crack, etc. in the field. In this study, consistency curves were measured by the viscometer as hydration reaction time passed. At the same time the slump flow test and Vicat setting test were carried out for comparing with the results of rheological properties. The fluidity of the W/B 30% decreased as the increase of replacement ratio of blast furnace slag. But in case of W/B 40%, the replacement ration did not significantly influenced to the slump flow value with the passage of hydration time. By the replacement of blast furnace slag to cement, initial setting was delayed and the time gap between initial and final setting became shorten. Through the regression analysis using Bingham model, there are a sudden changes of viscosity and yield stress around initial setting in case of low W/B 30%. The increase of workability by the change of free water in cement paste was offset by the coating effect of impermeable layer in case of W/B 40%.
철근콘크리트구조물의 중성화에 영향을 미치는 투기계수와 CO<sub>2</sub>확산계수의 관계
조봉석 ( Cho Bong Suk ),윤종기 ( Yoon Jong Kee ),이태희 ( Lee Tae Hee ),장종호 ( Chang Jong Ho ),강석표 ( Kang Suk Pyo ),김무한 ( Kim Moo Han ) 한국구조물진단유지관리공학회 2002 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.6 No.2
Among durability of concrete, the carbonation process corrodes bar makes progress slowly by the diffusions of CO<sub>2</sub> from surface of concrete. This carbonation process is affected by both the concrete factors such as W/C ratio, types of cement and aggregate, admixture types and the environmental factors such as CO<sub>2</sub> concentration, temperature, humidity and so forth. especially the carbonation process is closely related to CO<sub>2</sub> concentration and Air permeability. therefore This study is to examinis affected by relationship with Air permeability Coefficient and CO<sub>2</sub> diffusion Coefficient Have an Effect on carbonation in reinforced concrete As a results of this study, we have come to make a sense of an available correlation with Air permeability Coefficient and CO<sub>2</sub> diffusion Coefficient.