As environmental concerns become a critical issue in the sustainability of the steel industry, manufacturing of various kinds of glass-ceramics and related functional materials recycled from post-mortem slags has become an important topic of research. The slag composition, which was reduced and cooled using this secondary treatment is affected by the operating parameters and thermo-physical properties of the slag, and thus can provide the potential for utilization in highly value-added products such as Portland cement and high-alumina cement. To increase the applications of the reduced slag product, a new cement material as well as slag aggregates from the EAF slags were developed by controlling the composition and morphology through novel methods.

Recently, the use of eco-friendly deicer is recommended for solving problem of chloride deicing salts. The laboratory tests are often used to evaluate deicer performance, but they have been shown to correlate poorly to actual field performance. Thus, we would like to introduce the field test method for improving the performance qualification of anti-icing materials.

This study is to introduce the results of root resistance test on the sheet type domestic root resistance materials according to the test method by the Korea Conformity Laboratories(KCL) & KS F 4938.

In this study, the chemical resistance of polyurea resin waterproofing and anti-corrosion materials that is applied to the social infrastructure was analyzed. Mostly, there are three the main materials which is polyurea resin waterproofing and anti-corrosion, polyurea resin waterproofing and anti-corrosion, polyurethan-polyurea waterproofing and anti-corrosion, and polyurethane waterproofing and anti-corrosion were analyzed as the specimen. As a result of chemically resistant characteristic to three kinds of polyure type materials, it’s polyurethane, polyurea-urethane, and polyurea were arranged in the order. This order is generally predictable order that is expected by any user, but it was settled first by the quantitative evidence of chemical evaluation in this time. And, the result in this study will be utilizing as a basic data for establishing the quality standards which are able to judge the chemically resistant characteristic of polyurea resin waterproofing and anti-corrosion materials.

In this study, EL. 610 test and SHRP H-205.8 test were performed to evaluate the effects of deicing salts on concrete. According to the test results, EL. 610 chemical deicer test method was not enough to evaluate the chemical effects on concrete. On the contrary, the results of SHRP H-205.8 test method showed clear distinction between deicer type A and type B.

본 연구에서는 고경질 도막재로 PET 필름을 접합하는 시공방법에 있어서 PET 필름의 표면처리 조건 및 겹침이음 길이에 따른 접합특성 및 내구특성을 검토하였는데, 그 결과 무처리 보다 코로나 방전 처리에 의해 접촉각, 접합 인장강도, 벗김저항성이 개선되었다. 특히 시험체 E (코로나 방전+프라이머+강접접착제+폴리에스터 부직포)에서 가장 높은 것으로 나타났으며, 특히 겹침 이음길이 15mm 이상일 때 16주간 장기간 열화처리에도 안정적인 접합성능을 확보하는 것으로 나타나 방수재료로서 수밀성을 확보할 것으로 판단된다.

농산물 저온저장고 내부의 온도분포 균일화를 수치해석적으로 분석하기 위해 3차원 CFD 시뮬레이션을 수행하였다. CFD 시뮬레이션 모델은 속도벡터 및 온도분포 측정치와 비교를 통해 검증하였으며, 온도분포 균일화 향상을 위한 적정 팬용량 및 적재방법을 설정하기 위해 몇 가지 팬풍속 및 저장물과 벽체간의 거리 등에 대해 기류패턴과 온도 분포를 분석하였다. CFD 시뮬레이션의 검증에서 속도벡터 분포는 PIV시스템에 의한 측정치와 비교했을 때 표준 k-모

본 연구에서는 농산물 수집용으로 사용되는 팔레트 빈의 활용도를 높일 수 있도록 팔레트 빈의 구조를 차압통풍 예냉과 저온저장에 적용할 수 있도록 개선하였다. 감자, 양파, 감귤에 대한 팔레트 빈 밑면의 통기공 개공율에 따른 송풍저항을 측정하였으며, 팔레트 빈과 차압통풍식 냉각장치를 제작하였다. 감자, 양파, 감귤의 개공율, 퇴적높이, 송풍량 변화의 실험자료를 회귀식으로 나타내었으며, 비교적 높은 결정계수를 얻을 수 있었다. 감자, 양파, 감귤의 팔