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남경용 ( Nam Kyung-yong ),김성덕 ( Kim Seong-deok ),최석 ( Choi Suk ),양근혁 ( Yang Keun-hyeok ) 한국건축시공학회 2020 한국건축시공학회 학술발표대회 논문집 Vol.20 No.1
The purpose of this paper is to examine the characteristics of heat and hydration of concrete according to formwork materials. As a result of the experiment, it was found that there were no problems such as concrete heat loss and delay in hydration reaction due to the use of synthetic resin formwork.
남경용 ( Nam Kyung-yong ),김성덕 ( Kim Seong-deok ),최석 ( Choi Suk ),이영도 ( Lee Young-do ) 한국건축시공학회 2019 한국건축시공학회 학술발표대회 논문집 Vol.19 No.1
This study length variation test, shock test were conducted to evaluate the performance of synthetic resin form. Results of both thermal length variation test and shock test satisfied the KS standards. for length variation test, the result of the horizontal and vertical valuse were -0.1% in average.
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
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.
남경용 ( Nam Kyung-yong ),김성덕 ( Kim Seong-deok ),최석 ( Choi Suk ),이영도 ( Lee Young-do ) 한국건축시공학회 2019 한국건축시공학회 학술발표대회 논문집 Vol.19 No.1
This study is a mock-up experiment prior to field application of insulated gang form. In order to investigate concrete Heating cost in winter, pre-comparison was made before application.
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.
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 ),양근혁 ( Yang Keun-hyeok ),이영도 ( Lee Young-do ) 한국건축시공학회 2020 한국건축시공학회지 Vol.20 No.3
Synthetic resin formwork is made of lightweight high-density polyethylene(HDPE). This study used a process flow chart that satisfies the system boundary (such as Cradle-to- Product shipmen ) required by ISO FDIS 13352 to evaluate the entire process of synthetic resin foam using. The entire life cycle inventory (LCI) database calculated from input energy sources, materials used, transportation methods, and manufacturing processes at the system boundary was analyzed. Based on the environmental impact assessment index methodology of the Ministry of Environment from the LCI data analysis of synthetic resin formwork, the environmental impact assessment was carried out through classification, normalization, characterization, and weighting process. The experimental results are as follows the amount of CO<sub>2</sub> (carbon) emission considering the number of conversions was about 32% lower than that of the Euroform. This shows that the use of synthetic resin formwork reduces material production by half compared to Euroform and reduces CO<sub>2</sub> (carbon) emissions.