• 한국건축시공학회지
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• 제18권5호
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• pp.479-488
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• 2018

폐기물 및 이의 재활용 문제는 전 세계적인 환경문제로 인식되고 있으며, 플라스틱 폐기물은 인류의 목숨을 위협하는 가장 큰 사회적 문제로 인식되고 있다. 수직보호망도 플라시틱 수지를 사용하여 제조되는 것으로서 건설현장에서는 거푸집 공법 시공시 바깥면에 설치하여 낙하물 및 먼지의 비산 등을 방지하기 위하여 수직으로 설치하는 것으로서 본 연구에서는 건설현장에서의 수직보호망의 사용실태 파악과 최근 강화되고 있는 건설현장에서의 환경관련 규정의 변화와 이에 따른 현장기술자들의 인식을 제고하기 위함을 목적으로 진행하였다. 그리고 이를 바탕으로 건설현장에서 플라스틱수지를 사용하여 제조되어 무분별하게 사용되고 있는 수직보호망의 재질에 따른 합리적이고 친환경적인 자재의 사용과 이에 따른 수직보호망의 재활용을 촉진하기 위한 방안을 제시하고자 한다.

• Nuclear Engineering and Technology
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• 제54권11호
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• pp.4146-4158
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• 2022

Ultra-high performance concrete (UHPC) has been widely utilized in military and civil protective structures to resist intensive loadings attributed to its excellent properties, e.g., high tensile/compressive strength, high dynamic toughness and impact resistance. At present, aiming to improve the defects of the traditional vertical concrete cask (VCC), i.e., the external storage facility of spent fuel, with normal strength concrete (NSC) shield, e.g., heavy weight and difficult to fabricate/transform, the feasibility of UHPC applied in the shield of VCC is numerically examined considering its high radiation and corrosion resistance. Firstly, the finite element (FE) analyses approach and material model parameters of NSC and UHPC are verified based on the 1/3 scaled VCC tip-over test and drop hammer test on UHPC members, respectively. Then, the refined FE model of prototypical VCC is established and utilized to examine its dynamic behaviors and damage distribution in accidental tip-over and end-drop events, in which the various influential factors, e.g., UHPC shield thickness, concrete ground thickness, and sealing methods of steel container are considered. In conclusion, by quantitatively evaluating the safety of VCC in terms of the shield damage and vibrations, it is found that adopting the 300 mm-thick UHPC shield instead of the conventional 650 mm-thick NSC shield can reduce about 1/3 of the total weight of VCC, i.e., about 50 t, and 37% floor space, as well as guarantee the structural integrity of VCC during the accidental drop simultaneously. Besides, based on the parametric analyses, the thickness of concrete ground in the VCC storage site is recommended as less than 500 mm, and the welded connection is recommended for the sealing method of steel containers.