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초고층 현장 적용을 위한 초고강도 콘크리트의 각종 공학적 특성에 따른 관한 실험적 연구
고주환(Ko, Joo-Hwan),유승엽(Yoo, Seung-Yeup),구자술(Koo, Ja-Sul),문형재(Moon, Hyung-Jae),김정진(Kim, Jung-Jin),박순전(Park, Soon-Jeon) 대한건축학회 2012 大韓建築學會論文集 : 構造系 Vol.28 No.1
The aim of this study is to analyze various mechanical properties of 80㎫ high strength concrete developed for the field application of super high-rise building. Expecially, for reducing hydration heat and increasing various mechanical properties, two mixtures by the binder types were mixed and tested. And, as the test item of 80㎫, fresh, hardened, shrinkage and durability properties were tested. The results of study are as follows; Fresh properties of concrete such as flowability and air content are satisfied with targetted standard. Especially slump flow 500㎜ approaching time is lower than 5 seconds because of fine viscosity. The 28day’s compressive strength is higher than design strength regardless of concretes types. Tensile and flexural strength showed 1/15 and 1/8 of compressive strength. And the value of elastic modulus is above 40㎬. Durability properties of high strength concrete is extremely excellent. Three factors make the result like that. One factor is low water/binder ratio and second factor is the increase of hydration caused by high volume binder weight. And the final factor is that C-S-H gel originated by pozzolan reaction and latent hydraulicity of FA and BFS made inner organization closely.
펌프압송성 테스트를 완료한 고강도콘크리트의 1:1 Full Scale Core Wall Mock-up Test 수행에 관한 연구
고주환(Ko Joo-Hwan),문형재(Moon Hyung-Jae),석원균(Seok Won-Kyun),박순전(Park Soon-Jeon),김화중(Kim Hwa-Jung) 대한건축학회 2008 大韓建築學會論文集 : 構造系 Vol.24 No.8
According to the concentration of concerns about super tall builiding, various technologies for constructing super tall building are using nowadays. For constructing super tall building, maintenance properties of remicon slump flow considered a traffic jam and a delivery time of high strength concrete for direct pressure mix until 500m height must be required. And, super tall building above 100 floors is required that each floor's height is more than 4 meters, and each core wall's thickness is more than 60㎝. So, this study is the fundamental technology of direct pumping for high strength concrete to the targeted height during the construction and the full scale mock-up test for the successive accomplishment of super tall building, Test results are as follows; In the result of pumpability test, as pipe friction factor became higher, flow resistance was increased and delivery output was reduced. Before concrete pumping, the aimed fresh concrete properties of high flowable concrete were well satisfied. After concrete pumping, slump flow loss occurred in the case of 70㎫, and compressive strengths were higher than design strength. And, in the result of full scale mock-up test results, real strength of core wall was satisfied with design strength at 28 days regardless of types of strength, and lower part's strength was a little higher than upper part's strength. Lateral force was evaluated with max. 4.5t/m2, and hydration temperature of test was evaluated that maximum heat of central part revealed about 80℃ at 70㎫ and 65℃ at 50㎫, and, the difference between inner and outer part revealed about 30℃ at 70㎫ and 12℃ at 50㎫. Also, no by hydration temperature was not shown on the surface.
초고층용 고강도 콘크리트의 펌프 압송 전후 물성변화에 관한 실험적 연구
고주환(Ko Joo-Whan),김정진(Kim Jung-Jin),이상현(Lee Sang-Hyun),문형재(Moon Hyung-Jae),박순전(Park Soon-Jeon) 대한건축학회 2010 大韓建築學會論文集 : 構造系 Vol.26 No.9
High rise building requires high-strength concrete. These days high strength concrete is placed using concrete pump over 500m building. But high strength concrete pumping has a problem that physical property such as slump flow, air content can be changed after concrete pumping. This phenomenon makes concrete flowability and quality poor. So, in this study, 60, 70, 80MPa high strength concrete is placed over 570, 342, 228m pipeline and then physical property such as workability and air content were tested. As a result, physical property of concrete after pumping can be controlled with concrete mixture such as admixture type and content, And this result may be useful to those people who is going to place high-strength concrete to high-rise building with concrete pump.
철분을 혼입한 모르타르속의 염화물이온 이동 모델에 관한 연구
고주환(Ko Joo-Hwan),김정진(Kim Jeong-Jin),박순전(Park Soon-Jeon) 대한건축학회 2008 大韓建築學會論文集 : 構造系 Vol.24 No.5
In this study the prediction model of Chloride ion progress rate of concrete using steel powder as an addition is developed, in which the reduction of not only the diffusion rate of Cl? but also the amount of Fe<SUP>2+</SUP> by replenishment of pore by corrosion products. The model is based on the diffusions of Cl? and its reaction with Fe<SUP>2+</SUP> in chloride attack progression region. The model can also explain the characteristics of chloride ion permeation resistance of concrete that the matrix is densified due to chloride attack. The prediction by the model agreed well the experimental data in which the concrete using steel powder, and it showed the higher rate at chloride attack in early age and the lower rate in long-term age than the concrete without steel powder. Consequently the model can predict the rate of chloride attack of concrete exposed in the atmosphere regardless of the water-to-cement raito, the amount of the content of steel powder, etc.