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중성화된 콘크리트의 알카리성 회복을 위한 알카리성 부여제 활용기술
유재강 ( Yoo Jae-kang ),이강우 ( Lee Kang-woo ),최성우 ( Choi Sung-woo ),김용로 ( Kim Yong-ro ),권영진 ( Kwon Young-jin ),김무한 ( Kim Moo-han ) 한국구조물진단유지관리공학회 2000 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.4 No.1
Recently, according to the increase of carbonic acid gas by industrial development, a carbonation brings about the serious problem of durability in reinforced concrete structures. So, it is required the repair system for deteriorated concrete by carbonation. In this paper, we investigate recovery performance by impregnating alkalization agent in carbonated concrete, then we evaluate alkali maintenance performance by pH survey in each kind of finishing materials.
촉진 및 침지시험에 의한 혼화재 혼입 콘크리트의 내염성능 평가연구
유재강 ( Yoo Jae-kang ),김동석 ( Kim Dong-seuk ),박상준 ( Park Sang-joon ),원철 ( Won Chul ) 한국구조물진단유지관리공학회 2004 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.8 No.2
This paper investigate that the effect of the concretes containing mineral admixture(fly ash, ground granulated blast furnace slag, silica fume, meta-kaolin) on the resistance properties to chloride ion invasion by the Rapid Chloride Migration Test(RCMT) and the long term immersing test. The purposed testing procedure was applied to the concrete mixed mineral admixtures for 3~4 replacement ratios under W/B ratios ranged from 0.40 to 0.55. For the RCMT, Tang and Nilsson's method was used to estimate the migration coefficient of chloride ion. The results could be summarized as follows; ① The addition of mineral admixtures by mass enhanced the resistance of the concrete to chloride penetration compared with the plain concrete. (2) The optimal replacement ratios of admixture had a limitation for each admixtures. ③ Chloride migration coefficient estimated at 28 days by the RCMT had a well establishment with the chloride diffusion coefficient estimated by the immersion test at 330days.
요소의 침식을 받은 철근콘크리트구조물의 진단 및 내구성개선에 관한 사례연구
유재강 ( Yoo Jae-kang ),강석표 ( Kang Suk-puo ),정원각 ( Jung Won-gak ),권영진 ( Kwon Young-jin ),김무한 ( Kim Moo-han ) 한국구조물진단유지관리공학회 1999 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.3 No.1
The Reinforced concrete structure is deteriorated rapidly by the salt damage, carbonation, frost action, alkali-silica reaction, chemical attack and etc. Since numerous physical and chemical causes of deterioration are simultaneously and complexly at work, so, it is the most important to cut off the mechanisms of deterioration in order to prevent serious deterioration in reinforced concrete structure. But in case of chemical attack, they appear not to occur frequently. So there is not so much investigation about chemical attack and repair system. Therefore, it is the aim of this study to suggest elementary data for the reinforced concrete structure deteriorated by the chemical attack.
지하철 구조물의 성능저하 현황 및 내구성 향상을 위한 보수공법
유재강 ( Yoo¸ Jae-kang ),이강우 ( Lee¸ Kang-woo ),강석표 ( Kang¸ Suk-pyo ),권영진 ( Kwon¸ Young-jin ),김무한 ( Kim¸ Moo-han ) 한국구조물진단유지관리공학회 2000 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.4 No.2
In the city life, the subway is the main core-traffic network. Because many people use the subway, the subway structure required high security and long-term durability. As time elapsed, the concrete structure become deteriorated by the many of deterioration factors and the environmental conditions. So, it is important that the diagnosis and the repair on time for increasing durability. This paper shows the deteriorated condition of Seoul subway structures, and present the repair method which was suggested by the Architectural Institute of Japan.
촉진 및 침지시험에 의한 혼화재 혼입 콘크리트의 내염성능 평가연구
유재강(Yoo Jae-Kang),김동석(Kim Dong-Seuk),박상준(Park Sang-Joon),원철(Won Chul) 한국구조물진단유지관리학회 2004 한국구조물진단학회 학술발표회논문집 Vol.- No.-
This paper Investigate that the effect of the concretes containing mineral admixture(fly ash, ground granulated blast furnace slag, silica fume, meta-kaolin) on the resistance properties to chloride Ion invasion by the Rapid Chloride Migration Test(RCMT) and the long tenn Immersing test The purposed testing procedure was applied to the concrete mixed mineral admixtures for 3~4 replacement ratios under W/B ratios ranged from 0.40 to 055 For the RCMT, Tang and Nilsson's method was used to estimate the migration coefficient of chloride ion The results could be summarized as follows, ① The addition of mineral admixtures by mass enhanced the resistance of the concrete to chloride penetration compared With the plain concrete. ② The optimal replacement ratios of admixture had a limitation for each admixtures. ③ Chloride migration coefficient estimated at 28 days by the RCMT had a well establishment With the chloride diffusion coefficient estimated by the immersion test at 330days.