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건설재료로서 고밀도 폴리에틸렌(HDPE)의 역학적 특성평가
남경용 ( Nam Kyung-yong ),이재욱 ( Lee Jae-uk ),최석 ( Choi Suk ),양근혁 ( Yang Keun-hyeok ) 한국건축시공학회 2019 한국건축시공학회 학술발표대회 논문집 Vol.19 No.2
The strengths and elastic modulus of high-density polyethylene in compression and tension met the minimum requirements of precast concrete products.
남경용(Nam, Kyung-Yong),이혜진(Lee, Hye-Jin),양근혁(Yang, Keun-Hyeok),문주현(Mun, Ju-Hyun) 대한건축학회 2020 대한건축학회논문집 Vol.36 No.8
The objective of this study is to examine the flexural behavior of the developed synthetic resin formwork and propose a simple model for their stiffness (K) for straightforwardly determining a thickness of form to achieve the minimum requirements specified in KS F 5651. The deflection of the synthetic resin formworks was commonly greater than that of the euro form, indicating a lower flexural stiffness for the former than the latter. As a result, all synthetic resin formwork tested did not meet the deflection requirement of KS F 5651. The stiffness model was derived from strain compatibility, force equilibrium, and curvature distributions along the form length on the basis of the elasticity theorem, considering the tie-holes given in the form. The proposed model predicts accurately the slope of the load-displacement curve obtained from the foams under flexure. Using the proposed K model, design chart is developed for determining the thickness of formwork with different sizes and material properties.
남경용 ( Nam¸ Kyung-yong ),김성덕 ( Kim¸ Seong-deok ),최석 ( Choi¸ Suk ),유정일 ( Yoo¸ Jung-il ) 한국건축시공학회 2021 한국건축시공학회 학술발표대회 논문집 Vol.21 No.2
This paper aims to quantitatively evaluate concrete quality factors according to the application of thermal insulated gang form. As a result of the experiment, it was found that the amount of calcium hydroxide produced increased in the insulated gang form than in the general gang form, and the thicker the insulation of the insulated gang form, the greater the amount of calcium hydroxide produced.
단열갱폼 적용에 따른 동절기 보양비 사용량 및 발열량 검토에 관한 실험적 연구
남경용 ( Nam Kyung-yong ),최석 ( Choi Suk ),안성진 ( Ahn Sung-jin ),임명관 ( Lim Myung-kwan ) 한국건축시공학회 2020 한국건축시공학회지 Vol.20 No.1
본 논문은 동절기 콘크리트 보양 시 투입되는 에너지(전력) 소비량과 콘크리트 발열량 변화를 통해 단열갱폼의 단열성능을 검토하고자 하였다. 실험결과에 따르면, 일반갱폼은 콘크리트 타설 이후 12시간동안 에너지(전력) 소비가 3회 발생하게 된다. 반면 단열갱폼은 콘크리트 타설 후 21시간 동안 에너지(전력) 소비가 발생되지 않았다. 최종 전력 소비량은 일반갱폼이 단열갱폼보다 3.7배 높게 나타나 에너지(전력) 소비에서 단열갱폼의 우수한 성능을 확인할 수 있었다. 발열량 검토결과는 일반갱폼에서 콘크리트 타설 후 외기온도변화에 따라 발열량이 크게 변하는 것을 알 수 있었다. 하지만 단열갱폼의 경우 프레임 일부에서 미비한 열손실이 발생했을 뿐 콘크리트 타설 직후부터 거푸집 탈형까지 일정한 발열패턴을 보여주고 있었다. This paper aims to examine the insulation performance of insulated gang form by changing the energy (power) consumption and concrete calorific value to assist in concrete protection in cold weather. According to the test results, the general gang form will generate three times the energy (power) consumption for 12 hours after the concrete is poured. In contrast, insulated gang foam consumed no energy (power) for 21 hours after pouring. The final power consumption was 3.7 times higher than that of the general gang form, confirming the improved performance of insulated gang form with regard to energy (power) consumption. The calorific value examination shows that the calorific value changes significantly according to the change of outside temperature after concrete placement in the case of the general gang form. However, in the case of the insulated gang form, only a slight heat loss occurred in the part of the frame, and it showed a constant heating pattern from the concrete casting to the demolding of the mold.
경질우레탄 보드를 접착한 갱폼 사용에 따른 콘크리트의 온도이력 및 강도발현 특성
남경용(Nam, Kyung-Yong),원준연(Won, Joon-Yuen),전재열(Chun, Jae-Youl),정상진(Jung, Sang-Jin) 대한건축학회 2012 大韓建築學會論文集 : 構造系 Vol.28 No.7
This paper has fabricated insulation gang-form adhering general gang-form to the polyisocyanurate board and analyzed type of members, temperature record by locations and strength development after placing the concrete, in order to ensure efficient concrete quality under cold weather. According to our test, we can see that general gang-form member with curing under the same conditions as the actual field has a trend of constantly decreasing concrete temperature regardless to surface or central area due to rapid outdoor air temperature reduction, while in the case of insulation gang-from I and II, temperature increased up to around 25℃ after 12 hours under rapid outdoor air temperature change and temperature distribution did not appear large separation according to hydration reaction measurement locations. In addition, results of measurement for temperature records on weak insulation area by types of gang-forms showed that the temperature record distribution on the form tie surface and horizontal bar surface of angle bar has generally similar trend as the temperature records on the surface of the insulation gang-form, while corner area of the insulation gang-form did not have large insulation effect. It is determined that it requires additional curing measure for the weak corner area of the insulation gang-form in the future.
-20℃ 혹한기 조건에서 단열갱폼 사용에 따른 콘크리트 온도이력 및 미세공극 특성
남경용(Nam, Kyung-Yong),하정수(Ha, Jung-Soo),이동하(Lee, Dong-Ha),박태원(Park, Tae-Won),원준연(Won, Joon-Yuen) 대한건축학회 2016 大韓建築學會論文集 : 構造系 Vol.32 No.1
This paper is about a test performed to concrete form work in -20℃ cold weather conditions on climate change by global warming Furthermore, this paper examines limitations in application insulation gang form and analysis temperature history, strength development and characteristic of micropore of concrete placed in abnormal winter weather. According to the test result, concrete temperature dropped below 0℃ in the case of general gang form 12 hours after concrete placement. However, we could find excellent insulating effect rather than general gang form in the case of insulation gang form because temperature of outer surface and core of concrete has not dropped below 7℃ and highest temperatures was recorded 8~10℃ within 12 hours despite drastic ambient temperature conditions after concrete placing. In comparison of temperature record of surface portion of insulation gang form and that with or without wales by temperature record of insulation weak point, with wales is not as good as that on surface portion of insulation gang form. The reason for this is thought to be the decline in hydration reaction of concrete due to the decreases of ambient temperature and lack of insulation effect by wale protection made of pvc. As concrete got aged, the number of micropores less than 1㎛ has increased and it of the large voids has decreased. Also, more small pore were observed in concrete placed with insulation gang form than with general gang form.