• Journal of the Korea institute for structural maintenance and inspection
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• v.17 no.5
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• pp.40-48
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• 2013

Eco deck plate system is a construction method that deconstruction of galvanized steel sheets is possible by integrating steel-wire-integrated girders and the galvanized steel sheets with bolts. Therefore, compared with previous steel-wire-integrated deck plates which were joined by welding, the system is acknowledged as the construction method possible management and repair. This study conducted an experimental research by manufacturing total 24 full size specimens in a same condition for 12-shape specimens by two parts to evaluate structural behaviors of the eco deck plates. In the results after the test, permissible deflection for the construction load action was shown to be values under design values and satisfactory. The processing of lattice steel wires was presented to be structurally advantageous in being manufactured by cutting downward. Also, in case of a specimen that D13 as a steel wire was used, destruction occurred at the welding part of the bottom steel wire and the lattice steel wire, so improvement measures for the welding in factory manufacture are necessary.

• Journal of the Society of Disaster Information
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• v.9 no.1
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• pp.22-29
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• 2013

Warm mix asphalt(WMA), which is produced at lower temperatures than hot mix asphalt, has advantages in reductions of fuel consumption and greenhouse-gas emission. In this study, field tests such as skid resistance, rutting(permanent deformation), and roughness were conducted for analysis of long-term field performance of modified warm mix asphalt pavement. Skid resistance after 20 months represents the result similar to initial performance results but rutting and roughness decreased somewhat depending on the period of performance. Measurement results of permanent deformation and roughness could be acceptable because measured pavement location is bus lane that a lot of buses pass and stop. There were no cracks after 11 months, but some minor cracks were observed after 20 months. These results were influenced by increased crack resistance due to fiber addition.

• Proceedings of the Korea Water Resources Association Conference
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• 2018.05a
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• pp.79-79
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• 2018

하천시설물 설계, 시공 및 관리에 재료에 따른 호안이나 제방의 보호능력이 저하되어 설계 시 예상하지 못한 조건에서 쉽게 파손될 수 있으며, 하천환경의 변화를 야기시킬 수 있다. 제방 표면재료는 제외 비탈면의 침식 방지를 목적으로 사용되는 재료로 주로 호안블록. 식생 매트, 사석, 돌망태, 식생등이 주로 사용되며 국내에서는 2000년대 이전에는 자연 흙사면의 식생, 돌망태, 단순 돌기형 콘크리트 블록 등이 주로 사용되었으며 2000년대 이후에는 하천환경을 고려하여 식생의 생장이 가능한 친환경 호안 블록 및 식생 매트의 적용이 일반적인 실정이다. 제방의 수리적 설계를 위해서는 표면 재료의 수리 특성, 즉, 조도계수 및 한계 유속, 한계 소류력이 제시되어야 하는데 이는 실험을 통해서 결정되어야 한다. 때문에 본 연구에서는 자연형 하상재료를 이용하여 바이오 폴리머 첨가시 증가하는 방어능력에 대한 향상도를 평가하는 실험적 평가 방법을 제안하기위해 홍수시 수리조건을 반영하여 상류에서부터 사류까지 다양한 유속범위에 따른 세굴 및 침식에 대한 실험을 진행하였다. 본 연구에서는 실험연구를 통해 연구에 사용된 재료 외 추가적인 재료에 대해서도 평가방법이 적용될 수 있도록 제방 재료의 안정성 평가시스템을 개발하였고, 안정성 평가를 위한 실험진행은 기 개발된 바닥응력을 직접측정하는 장치와 PIV시스템을 이용하여 수리특성을 측정하였다.(Park J.H. et al. 2016, Flow Measurment and instrumentation.) 이러한 측정 장치를 이용하여 바이오폴리머의 첨가에 유무에 따라 세굴에 대한 방어능력의 향상정도를 측정하고자 세굴 및 침식에 대한 평가 방법을 제시하고 있다.

• Journal of the Korean Geosynthetics Society
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• v.21 no.3
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• pp.21-27
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• 2022

For carbon neutrality, interest in R&D and infrastructure construction for hydrogen energy, an eco-friendly energy source, is growing worldwide. In particular, for hydrogen stations installed in downtown areas, underground hydrogen infrastructure are being considered to increase a safety distance from hydrogen tank explosions to adjacent structures. In order to design an appropriate location and depth of the underground hydrogen infrastructure, it is necessary to evaluate the impact of the explosion of the underground hydrogen infrastructure on adjacent structures. In this paper, a numerical model was developed to analyze the effect of the underground hydrogen infrastructure explosion on adjacent structures, and the over pressure of the hydrogen tank was evaluated using the equivalent TNT (Trinitrotoluene) model. In addition, parametric analysis was performed to estimate the stability of adjacent structures according to the construction conditions of the underground hydrogen infrastructure.

• Journal of the Korean Recycled Construction Resources Institute
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• v.11 no.3
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• pp.251-259
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• 2023

In this study, as a foundational research aimed at promoting the efficient recycling and environmentally friendly disposal of construction waste through the activation of a selective dismantling system, our primary objective was to analyze the economic feasibility of implementing selective dismantling. To achieve this, we conducted an assessment on a 5-story residential building with a construction area of 2,400 m² as a case study. When considering the additional cost of dismantling construction ① the reduction in waste disposal costs due to decreased mixed waste, ② and the potential revenue from recycling through the separation and sorting of waste materials, and ③ we were able to comprehensively confirm that there is an expected cost-saving effect totaling 34,727,000 KRW when compared to conventional demolition methods.

• Explosives and Blasting
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• v.28 no.2
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• pp.99-107
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• 2010

Domestic explosive demolition techniques have been developed and applied for low-rise structures up to now. However, the demand for the development of those techniques that can be applied economically, safely and environment-friendly rapidly increases because the old high-rise RC rahmen structures that were built since around 1970s are now required to rebuild. As a result, element technologies of explosive demolition for low-rise structures were applied to take advantage of technology in high-rise structures that performed application testing at Chungang Department demolition field in Daejeon city. It could judge elements technology establishment for high-rise structure demolition and field application and suggest the improvements when the problems occurred to develop High-rise building demolition techniques for method of protection a field test and the dust reduction test. The water cannon test was applied to reduce the dust site and the drilling tests are performed to select the best components for explosives demolition elements techniques of the reliability. This paper shows that we have the ability to remove a high-rise building using environmentally friendly safe and economical explosives demolition method. It would contribute to prevent a foreign company from entering the domestic market and should contribute to acquire competitiveness of domestic demolition industry.

• Journal of the Korean Society for Marine Environment & Energy
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• v.16 no.4
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• pp.290-298
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• 2013

A Saemangeum Development Project, which is a national project in South Korea, has started with the objective of developing the reclaimed area mainly agricultural land use since the mid'80s. To develop a model of the global eco-reclamation, constructions of the eco-friendly counter facilities such as sluice gates and inner dikes, as well as environmental preservation measures for an estuary reservoir, have been carried out. However, reasonable measures of the water quality management for the Saemangeum area are required. Thus, the purpose of this study is to rigorously analyze and quantitatively evaluate the environmental problems due to the water level management associated with inner dike constructions. To achieve these objectives, the affecting factors on determination of water level management are described and a series of calibrated transient-state numerical simulations was performed to demonstrate the salinity distribution difference in the estuary before and after the construction of inner dikes. The overall salinity reduced about 2~5 psu, and the seawater intrusion was weakened by a well-regulated waterway after construction of the inner dikes compared to before construction of them.

• Korean Journal of Construction Engineering and Management
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• v.8 no.4
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• pp.128-136
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• 2007

As the international-level concern has been focused on the environmental sustainability in recent years, many researches emphasized the needs for methods and techniques that would facilitate sustainability assessment at the various project level interfaces. As part of methods and techniques to facilitate sustainability assessment, this paper provides 'Computerized Waste Management Performance Evaluation Tool' for the purpose of assessing the level of management system in dealing with the onsite construction wastes. This tool applies twenty-three waste management performance factors for the purpose of evaluating the level of waste management performance by scoring those factors which were identified in the previous research. These twenty-three factors are classified into four categories: manpower, material, method, and management based on their characteristics. In order to quantitatively evaluate the effectiveness of waste management performance, the levels of actions executed in a site by each waste management performance factor were identified and their weight were analyzed throughout the expert interview and survey. Furthermore, an excel-based computerized tool was developed in order to facilitate the evaluation process. If this tool can be developed in more detail and be used as the method to control waste management at a project level for the future, it is expected that this tool can play an important role in the body of knowledge of environmental management in construction industry.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2010.04a
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• pp.231-233
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• 2010

최근 어항에도 친환경항만을 건설하기 위한 노력이 국제적으로 확산되고 있으며, 우리나라에서도 어항의 정비 및 재개발부분에서 적극적으로 수질개선을 위한 기술 적용이 본격화 되고 있다. 본 연구는 우리나라 남해의 소규모 어항 및 해수욕장에 슬릿형 해안 구조물이 시공된 실해역의 실측자료와 수치해석을 통해 현장적용성의 분석을 수행하였다. 수치실험으로는 파랑작용 평형방정식을 이용하는 SWAN 모델을 구성하고 수리모형실험에서 분석된 실린더 슬릿형 방파제의 반사와 투과계수를 모텔에 도입하였다. 수치실험은 한국해양연구원의 전해역 심해설계파 추정 보고서 II (2005)중의 심해설계파 제원을 사용하였으며, 대상해역의 1970년~2006년 (37년간) 관측된 연최대 풍속자료를 이용하여 모델에 반영하였다. 설리항에서 S, SSE, SE계열의 파랑의 내습에 대한 분석을 수행하였으며, 그 결과 구조물이 항내에서 정온도가 유지되며 해수순환에도 이점이 있음을 현장관측 자료분석과 수치실험결과를 통하여 확인할 수 있었다.

• Proceedings of the Korean Institute of Building Construction Conference
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• 2023.05a
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• pp.111-112
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• 2023

With the development of cities, the density of the population is continuously increasing as buildings become larger and more high-rise, but since the Haeundae residential complex fire in Busan in 2010, there has been a growing need to meet the fire protection performance of buildings as large-scale fires continue to occur every year. On the other hand, fire doors, which are one of the fire protection performance of buildings, have been judged unqualified in 82% of cases when fire doors constructed on the actual site were inspected after completion. The reason for this is that paper honeycomb and glasswool, which are used as core materials for fire doors, absorb moisture, reducing thermal insulation performance, and sagging due to increased weight, leading to performance degradation due to warping in empty spaces. To overcome these problems, research is underway to apply lightweight aerated concrete, an inorganic material, as a core material. Therefore, in order to select a blowing agent that produces stable bubbles prior to the production of lightweight bubble concrete for application as a fire door inner core, this study examined the physical performance according to the type of blowing agent and dilution concentration, and the following conclusions were drawn. Compared to vegetable bubbles and independent bubbles, synthetic bubbles have 3~8% higher thermal conductivity than independent bubbles, but 3~6% lower slurry density than vegetable bubbles, and 2~13% higher compressive strength, which is thought to be an improvement of synthetic bubbles.