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장기폭로실험에 의한 철근콘크리트 구조물 보수재료 · 공법의 성능평가에 관한 연구
김무한,김용로,김재환,장종호,조봉석,Kim Moo-Han,Kim Yong-Ro,Kim Jae-Hwan,Ho Jang-Jong,Cho Bong-Suk 한국콘크리트학회 2004 콘크리트학회논문집 Vol.16 No.5
본 연구에서는 최근 국내에서 신기술 등으로 인증되어 활용되고 있는 보수재료 공법을 적용한 폭로시험체를 제작한 후, 해양환경 및 일반대기환경 하에서 장기폭로실험에 의한 정량적 폭로실험데이터를 확보함으로서 향후 성능 저하된 철근콘크리트 구조물의 보수재료 공법 성능평가 방법 및 품질관리기준 확립을 위한 기초자료를 제시하고자 하였다. 해양 및 일반대기환경 하에서 폭로재령 18개월까지 폭로실험을 실시한 결과 일부 보수공법에 있어서 표면피복재 및 단면복구재의 미세균열 부풀음, 박리현상과 보수경계부위의 균열 및 보수부위와 비보수부위의 전위차가 다소 발생하고 있는 것으로 나타났으며 향후 폭로시험체의 지속적인 평가 및 파괴에 의한 상세평가를 통하여 정량적인 폭로실험 데이터를 확보함으로서 보수재료 공법의 성능평가방법 및 품질관리기준 확립을 위한 기초 자료를 제시할 수 있을 것으로 판단된다. In this study, for the establishment of the performance evaluation methods and the quality control standard of durability recovery method, the quantitative exposure data by long term exposure test under the coast and air environment is accumulated and analyzed. Investigating and evaluating the result of exposure test during 18 months of exposure age under the coastal and normal atmosphere environment, micro crack, swelling and spatting of surface coating material crack of repair standards of repair material and method through continuous exposure test in the future.
고강도 콘크리트의 수화열 저감에 미치는 혼화재 종류 및 대체율의 영향에 관한 연구
김무한,최세진,오시덕,김용로,이종호,Kim, Moo-Han,Choi, Se-Jin,Oh, Si-Duk,Kim, Yong-Ro,Lee, Jong-Ho 한국건축시공학회 2002 한국건축시공학회지 Vol.2 No.2
The hydration of cement paste occurs when the cement is miked with water. During the hydration, hydration heat causes the thermal stress depending on the site of concrete and the cement content. Especially in the high-strength concrete, we must give care to the concrete due to its large cement content. In this study conduction calorimeter and concrete insulation hydration heat meter were used to investigation the hydration heat characteristics of cement and concrete. To reduce hydration heat of high-strength concrete, several types of replacement of fly-ash and blast-furnace slag powder were used in this experiment. As a result of this study, it was found that hydration heat of high-strength concrete was reduced by replacement of fly-ash and blast-furnace slag powder. In case of high-strength concrete using blast-furnace slag powder, the max-heat arrival time was delayed but an effect of heat reduction was lower than a case of high-strength concrete using fly-ash, because it was considered that the heat-dependence property of blast-furnace slag powder was higher than that of fly-ash.
고강도콘크리트의 압축강도 추정을 위한 비파괴시험식의 적용성에 관한 연구
김무한,최세진,강석표,김재환,장종호,Kim, Moo-Han,Choi, Se-Jin,Kang, Suk-Pyo,Kim, Jae-Hwan,Jang, Jong-Ho 한국건축시공학회 2002 한국건축시공학회지 Vol.2 No.3
Recently, it is being studied on the high strength concrete in many laboratories and being applied to the construction field actually. But non-destruction testing equation that to be proposed about normal strength concrete in Japan has been using because the systematic study results for the estimation of compressive strength of high strength concrete do nit exist. So it is essential to suggest the non-destruction testing equation for the estimation of compressive strength of high strength concrete. This is an experimental study to analyze and investigate the non-destruction testing equation for the estimation of compressive strength of high strength concrete. The results are as follows; The relation between rebound number, pulse velocity and compressive strength of high strength concrete have lower coefficient than combined method of rebound number and pulse velocity. Also new non-destructive testing equation for the estimation on the compressive strength of high strength concrete was suggested in this study, and it is considered that these equations have possibility to be applied in domestic construction field.