This research evaluated the environmental impact of waste film used in the farming industry which is subject to voluntary agreement by Waste Charge System using Life Cycle Assessment (LCA). When analyzing the environmental scores applying weighted values, production of raw materials, production of goods and disposal had nearly 73%, 15% and 11% of contribution to the environmental impact and also, amongst impact categories, resource depletion and global warming had 63% and 32% of contribution respectively. For resource depletion which had the highest contribution, production of raw materials, production of goods and disposal occupied around 86%, 9% and 4% of it, and the impact category of resource depletion that belongs to production of raw materials, accounted for about 54% of the whole environmental score. Here, over 95% of it was caused by crude oil. When investigating the contribution of each phase to global warming that is the key issue of low carbon green growth, production of raw materials, production of goods and disposal had respectively, 45%, 28% and 27% of contribution. As the result, production of goods and disposal had higher contributions than resource depletion. The entire contribution of production of goods and disposal to global warming was about 17%, and it is predicted that it would bring a huge impact, considering the possibility of establishing improvement plans. In the production of goods, electricity consumed was the main cause of global warming, and electricity used in the recycling process and incineration occupied approximately 52% and 42% of the disposal stage. In conclusion, we should pay attention to energy used in the production of goods and recycling for improving an environmental competitiveness of goods, and reduction of energy would be able to satisfy economic feasibility and environmental efficiency of the whole process of agricultural PE film.

This research evaluated the environmental impact of polyethylene water supply pipe which is a target of voluntary agreement by Waste Charge System using Life Cycle Assessment (LCA). When analyzing the contribution of each impact category to the environmental score, resource depletion had the highest contribution at 57% and it was followed by global warming with 35% of contribution. Amongst the entire process and stage, production of raw materials, production of goods and disposal had about 60%, 18% and 18% of contribution, respectively. For resource depletion which was found to have the highest contribution, production of raw materials, production of goods and disposal accounted for nearly 77%, 11% and 7% of it, and the impact category of resource depletion which belongs to production of raw materials accounted for nearly 44% of the whole environmental score. Here, it was found that 88% of it resulted from crude oil. When analyzing the contribution of each stage to global warming that is the key issue of low carbon green growth, then, production of raw materials, production of goods and disposal showed around 38%, 29% and 28% of contribution, respectively. As the result, production of goods and disposal had higher contributions than resource depletion. Electricity used for production of goods is the major cause of global warming, and electricity used in the recycling process and incineration occupied about 65% and 36% of the disposal stage. In conclusion, we need to seek for plans to reduce the use of electricity through optimization of energy use during the production of goods and disposal, in order to establish an environmental and economical competitiveness of PE-related enterprises that are operated on a small scale.

링 형태의 강섬유 (Ring-type steel fibers: 이하 RSF)는 원형의 폐곡선 형태를 갖는 강섬유로서 선형강섬유와는 다른 저항 메카니즘을 가지며 폐곡선으로 둘러싸인 평면에 대하여 동일한 방향성을 가지는 특성을 갖는다. 이 연구에서는 섬유의 단위투입량 15kg/㎥과 30kg/㎥의 RSF 및 선형 강섬유를 혼입한 콘크리트 패널의 휨인성을 실험, 비교하였다. 파단면에서의 RSF의 저항 형태를 규명하였으며 RSF를 혼입한 패널이 선형 강섬유를 혼입한 패널에 비하여 우수한 인성값을 나타냄이 관찰되었다. RSF에 대한 방향성을 제시하였으며 RSF를 혼입한 실험체의 경우, 보 실험체에 비하여 두께가 상대적으로 얇은 패널 실험체에서 RSF가 더 효율적으로 인성 증가에 기여함이 관찰되었다.