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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.
-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.
남경용 ( Nam Kyung-yong ),양근혁 ( Yang Keun-hyeok ),이영도 ( Lee Young-do ) 한국건축시공학회 2020 한국건축시공학회지 Vol.20 No.3
합성수지 거푸집은 내부식성이 우수한 경량의 고밀도 폴리에틸렌(HDPE)를 재료로 사용한다. 합성수지 거푸집의 전과정 평가를 위하여 ISO FDIS 13352에서 요구하는 시스템 경계를 만족하도록 공정 흐름도를 고려하였다. 이에 따라 고려된 시스템 경계는 Cradle-to- Product shipmen이다. 고려된 시스템 경계에서 투입 에너지원, 사용재료, 운송수단, 제작공정 등으로부터 산정한 전과정 목록(LCI) 데이터베이스를 분석하였다. 합성수지 거푸집의 LCI 데이터 분석으로부터 환경부의 환경영향평가지수 방법론에 기반하여 분류화, 정규화, 특성화 및 가중치 과정을 거쳐 환경영향평가를 수행하고, 그 결과는 유로폼의 환경영향 평가값과 비교하였다. 실험결과, 전용횟수를 고려한 CO<sub>2</sub> 배출량은 유로폼 대비 2배 이상의 전용성을 갖는 합성수지 거푸집이 약 32 % 가량 낮았다. 이는 합성수지 거푸집 사용은 유로폼 대비 자재 생산을 1/2로 줄일 수 있으며, CO<sub>2</sub> 배출량 저감으로 이어질 수 있다. 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.
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.
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.