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물시멘트비에 따른 콘크리트의 중성화 진행 예측에 관한 연구
조봉석 ( Cho Bong-suk ),김재환 ( Kim Jae-hwan ),강석표 ( Kang Suk-pyo ),임정수 ( Lim Jung-soo ),김무한 ( Kim Moo-han ),김용로 ( Kim Yong-ro ),최세진 ( Choi Se-jin ) 한국구조물진단유지관리공학회 2002 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.6 No.1
The 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, especially carbonation velocity is effected by CO<sub>2</sub> environment and W/C ratio. This study is to propose a carbonation prediction model by considering CO<sub>2</sub> concentration and finishing materials rerated diffusion coefficient. The model is based on the diffusions of CO<sub>2</sub> and its reaction with Ca(OH)<sub>2</sub> in carbonation progressing region. Finding out suitable diffusion coefficient and comparing experimental data with analytical data, it seems that the result is nearly identical. As a results of this study, the model can predict carbonation process of exposed concrete according to W/C ratio in the atmosphere.
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) 한국구조물진단유지관리학회 2005 한국구조물진단학회 학술발표회논문집 Vol.- No.-
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.