http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
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.
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.
심학보,박순전,고주환,Shim, Hak-Bo,Park, Soon-Joen,Ko, Joo-Hwan 대한건축학회 2011 대한건축학회논문집 Vol.27 No.8
A lot of push-out tests of shear studs embedded in normal strength concrete were conducted. So current design code methods of the shear studs are based on the test results of studs embedded in normal strength concrete. It also appeared that the strength of connector and the concrete strength are the main factors affecting the behavior of shear connections. But push-out test data of studs embedded in high strength concrete is insufficient until today. So it is necessary to evaluate the load-slip behavior and the shear capacity of studs embedded in high strength concrete for the appropriate design code. In this paper, it was performed push-out tests of shear studs embedded in high strength concrete and fiber reinforced concrete used widely in high-rise building. Experimental push-out tests were used to evaluate both the shear stud capacity and the load-slip curve of the connector. And the results of the finite element model are compared with push-out tests and the values given in current codes of practice.
LED와 유리관 스위치 센서를 이용한 스마트 콘크리트의 개발
김이성(Kim Ie-Sung),이수곤(Lee Soo-Gon),고주환(Ko Joo-Hwan),김동혁(Kim Dong-Hyeok),김화중(Kim Wha-Jung) 대한건축학회 2008 大韓建築學會論文集 : 構造系 Vol.24 No.11
Today, peoples have much interest about safety while an abnormal weather phenomenon is weighted increased. R.C buildings are consisting of main loaded members. Concrete are brittle materials and they are which come to brittle fracture rapidly by progress of cracks. If a research trend present in and outside the country is often seen, the structure measurement method of having used PZT and the optical fiber (FBG) will be the actual condition which has accomplished the stock. In order to manage such cracks, time, efforts and expense are required. Such a method has many difficulties in application of a structure by the difficult problem of the measurement range, and the expensive sensor price. Progressive cracks were generated by fracture of glass pipe sensor. Moreover, the experiment which can detect damage propriety by external Light Emitting Diode by damaging a glass pipe by load change with the application of switch using strain gage of a glass pipe was conducted.