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주거현장에서 창호 결로저항 성능을 확인하기 위한 다양한 실험 방법에 대한 고찰
장덕배(Jang, Duk-Bae),홍구표(Hong, Goo-Pyo) 대한건축학회 2012 대한건축학회논문집 Vol.28 No.6
Condensation has been a persistent and often misunderstood problem associated with windows. The purpose of this study was to analyze the tests about the condensation resistance for windows. We tested the condensation by Computer Simulation (WINDOW & THERM), Mock-up Test and Field Test. First, We conducted the simulation as pre-analysis. Second, We did Mock-up Test in the official approval laboratory, and last we made same condition in the residential building and measured the window surface’s temperatures. TDR values were calculated by measured temperatures and We observed the condensation of windows. It is possible that we could use three methods(Simulation, Mock-up Test and Field Test) to analyze the condensation resistance. Analyzing the condensation resistance result from the Field Test, we can verify the level of air tightness and quality of construction finish and also possible to improve it.
한중 콘크리트의 가열보온 양생막용 개량형 버블시트의 현장시공적용을 통한 성능평가
장덕배(Jang, Duk-Bae),최현규(Choi, Hyun-Kyu) 대한건축학회 2011 大韓建築學會論文集 : 構造系 Vol.27 No.11
Using cold weather concrete, you should know that how to maintain curing temperatures for its initial curing is very important, because it can cause frost damage at the beginning. So they mostly apply heating-insulation curing method for retaining curing temperatures of cold weather concrete in the domestic construction site. And thetent fabrics as curing sheet for heating-insulation curing are prevalent in the domestic construction site due to low price and easiness to handle. But the material is very low in insulative efficiencyand high in heat-loss coefficiency; moreover, it is easily torn off and a successive rupture phenomenon arises due to its low tensile performance, which makes it difficult to maintain the temperatures fit for curing, so frequently they have trouble in preventing the frost damage at the beginning due to the low efficiency in heating-insulation curing process. Accordingly, this study aims at verifying the efficiency in the use of the imporved bubble sheet for heating-insulation curing sheet through the analysis of concrete structure, temperature history of the space for installing the curing sheet, and strength property of concrete by applying the improved bubble sheet, which is created by reinforcing the tensileness of the bubble sheet excellence in insulative performance with mesh-tarpaulin as heating ?insulation curing sheet for cold weather concrete, to a field in the cold weather. As a result, it is verified that when you use improved bubble sheet as a substitution for the tent fabric, it is very efficient in the control of cold weather concrete quality and has great effectiveness in securing strength because of high tensileness and excellent insulativeness in the cold weather environment.
조분시멘트에 의한 개량2성분계 저발열시멘트를 활용한 매트기초 매스 콘크리트의 현장시공 적용
장덕배(Jang, Duk-Bae) 대한건축학회 2011 大韓建築學會論文集 : 構造系 Vol.27 No.10
This paper is to validate the effect of the application of improvement binary blended cement with the combination of OPC, FA and coarse particle cement on the reduction of hydration heat for field application. Mat foundation at the basement floor of steel reinforced concrete building constructed at Seoul OO project is considered for field application of the improvement binary blended cement. Slump, air content and chloride content met the target values. Compressive strength also satisfied the design strength at 28 days. According to temperature history, crack occurrence index at the center section in A, B and D placement zones had over 1.5, which can be protected from crack, while crack occurrence index at C placement zone had around 1.2∼1.5, which requires proper crack prevention measures. However, there are no significant crack induced by excessive hydration heat to be observed at the concrete after placement based on visual survey. Accordingly, it is thought that the application of improvement binary blended cement studied in this paper is valid to control the hydration heat of the mass concrete.
굵은입자 시멘트와 광물질 혼화재를 조합 사용하는 콘크리트의 기초적 특성
한천구,장덕배,Han, Cheon-Goo,Jang, Duk-Bae 한국건설순환자원학회 2010 한국건설순환자원학회지 Vol.5 No.1
본 연구에서는 보통포틀랜드 시멘트(이하 OPC)제조과정의 분쇄공정 중 밀출구에서 배출되는 비교적 가격이 저렴하면서, 수화열면으로도 효과일 것으로 예상되는 입자분포를 갖는 시멘트(이하 CC)를 대상으로 플라이애시(이하 FA)와 고로슬래그 미분말(이하 BS)를 복합치환하는 3성분계 저발열 시멘트로의 개발 가능성을 검토하기 위하여 유동성, 강도, 간이단열온도 상승량 등 기초적인 특성에 대하여 분석하고자 한다. 실험결과로 유동성은 CC의 치환율이 증가함에 따라 저하하는 경향을 보였고, FA+BS의 치환율이 늘어남에 따라 증가하는 경향을 나타냈다. 공기량은 CC의 치환율이 증가함에 따라 미소하게 감소하는 경향을 나타냈고, FA+BS의 치환율이 증가함에 따라 감소하였다. 응결특성으로 CC 및 FA+BS의 치환율이 증가 할수록 응결 시간은 지연되었다. 간이 단열에 의한 온도 상승량은 전반적으로 CC 치환율이 증가할수록, FA+BS의 치환율이 증가할수록 피크온도는 감소하였고, 이후 온도저하가 완만해 지는 경향을 나타냈다. 압축강도는 CC 및 FA+BS 치환율이 증가할수록 저하하였는데, 재령이 경과함에 따라 장기강도는 Plain과 동등하거나 동등 이상의 강도를 발현 하였다. 종합적으로 CC에 FA+BS를 치환하였을 때 유동성 및 공기량은 저하하는 경향을 나타냈으나, 수화열 면에서 양호한 저감효과를 보여 3성분계 저발열 시멘트로의 개발이 가능성할 것으로 사료된다. This research intends to analyze the basic characteristics of cements(hereinafter "CC") with affordable price and particle distribution effective as hydration heat face which are discharged at the outlet of smashing process of ordinary portland cement(hereinafter "OPC") manufacturing process such as fluidity, rigidity, temporary insulation temperature increase amount etc to review the potential of developing "CC" to 3 ingredients low heat cement that substitutes fly ash and blast furnace slag(hereinafter "BS"). As a result of experiment, fluidity tended to decrease with increase in CC substitution rate, and increase with increase in FA+BS substitution rate. Air amount tended to slightly decrease with increase in CC substitution rate, and decrease with increase in FA+BS substitution rate. Condensation characteristics were such that condensation time was delayed with increase in CC and FA+BS substitution rate. As for the temperature rising amount by temporary insulation, peak temperature decreased with increase in CC substitution rate and increase in FA+BS substitution rate in general, and thereafter, temperature tended to decrease slowly. Compressive strength decreased with increase in CC and FA+BS substitution rate, and as aging goes on, long term strength was equivalent to plain or higher. By and large, when FA+BS was substituted to CC, fluidity and air amount tended to decrease, but hydration heat face showed good reduction effects, suggesting possibility of development to 3 ingredients low heat cement.
RC 라멘조에 SMART Frame 적용 시 효용성 분석
조원현 ( Wonhyun Cho ),임채연 ( Chaeyeon Lim ),장덕배 ( Duk Bea Jang ),김선국 ( Sunkuk Kim ) 한국건축시공학회 2015 한국건축시공학회 학술발표대회 논문집 Vol.15 No.2
SMART Frame is a composite precast concrete structure system to deliver the advantages of both steel frame and reinforced concrete. Many studies have established to date that SMART Frame is more advantageous than conventional frame-type structure in terms of structural stability, constructability, economic viability as well as reduction of construction schedule. However, such studies have focused primarily on wall-type or flat slab-type apartment housing structures, failing to include Rahmen structures in their scope. Accordingly, this study aims to analyze the benefits of potential application of SMART Frame to RC Rahmen structures. As the structural stability and constructability of SMART Frame is already proven, this study reviews its benefits from the perspective of cost reduction. Conclusion of this study will be used subsequently in predicting the benefits of SMART Frame when it is adapted to RC Rahmen structures.