In response to the global interest and efforts towards reducing plastic use and promoting resource recycling, there is a growing need to establish methods for recycling discarded fishing gear. In Korea, various technologies are being developed to recycle discarded fishing gear, but significant technical and policy challenges still remain. In particular, biodegradable gill nets require a pre-treatment process to separate biodegradable materials from other substances and to remove salt before recycling. Therefore, this study aims to develop a pre-treatment device for recycling biodegradable gill nets and to evaluate the feasibility of recycling them.

The structural stability of the recycled concrete disposal container was evaluated and compared the applicability of the current design standards for recycled concrete of nuclear power plant. The structural stability requirement for concrete disposal containers is 37.7 MPa or more. As a result of the compressive strength test on recycled concrete, 50% of coarse aggregates of recycled concrete was 42.1 MPa. In addition, it was found that the bending strength and shear strength of recycled reinforced concrete beam exceeded the current design standard. Therefore, it is judged that recycled concrete containing coarse aggregates can be sufficiently utilized. It was possible to ensure the structural stability of the concrete container without changing the design specifications and reinforcing bars when recycled concrete is applied.

The use of recycled materials, such as the fine recycled aggregate made from concrete waste and carbon fiber (CF) product of industrial waste, for the manufacture of conductive recycled mortars (CRM), transforms the mortar base cement normally made with cement:sand in a sustainable multifunctional material, conferring satisfactory mechanical and electrical properties for non-structural uses. This action provides ecological benefits, reducing the use of natural fine aggregates from rivers and the amount of concrete waste deposited in landfills resulting from construction waste. In this investigation the effect of the addition of CF on electrical properties in hardened, wet and dry state, electric percolation in dry state and fluidity of the wet mixture of a cement based CRM was evaluated: fine recycled aggregate: graphite powder, CRM specimens with dimensions of 4 × 4 × 16 cm. were manufactured for 3, 7 and 28 days of age and sand/cement ratios = 1.00, graphite/cement = 1.00, water/cement = 0.60 and CF = 0.1, 0.3, 0.5, 1.0, 1.5, 2.0, 2.5 and 3.0% compared to the weight of cement. The results demonstrated the effect of the addition of CF in CRM, reducing fluidity of the mixtures due to the opposition generated by its physical interaction of CF with recycled sand or recycled fine aggregate and graphite powder (GP), in its case, placing the electric percolation percolation at 0.30% and 0.45% of CF for CRM with and without GP, respectively. Increases in electrical conductivity (EC) without the presence of GP are defined by the contact between the CF and the conductive paths formed. In contrast, with the presence of GP, the EC is defined by the contact between the CF and the GP simultaneously, forming conductive routes with greater performance in its EC.

Antioxidant agent, 1,1,3-tris(2-methyl-4-hydroxy-5-tert-butylphenyl)butane were prepared and investigated the antioxidant activity on recycled rubber mat manufactured with waste tire powder. Mechanical properties of rubber mat are influenced by many factor such as compounding ingredients and state of cure, process of rubber, and fillers. Our study aim is to investigate influence of antioxidant activities on ozone cracking and the thermal aging time. In this work, the degradation of recycled rubber mat was studied and suggested mechanism to involve two-type of degradation, thermal aging and cracking both of which can be contained antioxidant or non-antioxidant agent.

[ ] a cathode material for lithium rechargeable batteries, was prepared using recycled . First, the cobalt hydroxide powders were separated from waste WC-Co hard metal with acid-base chemical treatment, and then the impurities were eliminated by centrifuge method. Subsequently, powders were prepared by thermal treatment of resulting . By adding a certain amount of and , the was obtained by sintering for 10 h in air at . The synthesized particles were characterized by X-ray diffraction (XRD) and Scanning Electron Microscope (SEM) analysis.

본 연구는 판유리 등의 생산 기초 원료인 소다회 (Na2CO3) 생산 과정에서 발생되는 산업 부산물인 부산석회를 아스팔트 혼합물의 채움재로서 재활용 가능성을 검토하여 부산석회의 실질적인 활용 방안을 제시하고자 한다. 이를 위하여 부산석회를 기존의 석회석분 채움재에서 중량 대비 25%, 50%, 75%, 100%로 대체하여 제조한 아스팔트 혼합물에 대해 간접인장강도 시험, 회복탄성계수 시험, 수분 민감성 시험, 반복하중 간접인장 시험, 휠트래킹 시험을 실시하여 부산석회의 채움재 활용 가능성을 파악하였다. 또한 기존 석회석분 채움재를 사용한 아스팔트 혼합물과 소석회 (Hydrated Lime)를 사용한 아스팔트 혼합물의 공학적 특성을 비교 분석하여 부산석회를 재활용한 아스팔트 혼합물의 성능 증진 효과를 평가하고 본 기술의 실용화 가능성을 판단하였다.

건설폐기물의 재활용방법 중 하나는 폐콘크리트 재생골재를 도로포장재료로 활용하는 것이다. 하지만 재생골재에 대한 많은 연구와 기술개발에도 불구하고 생산공정에 포함된 이물질 때문에 실제 도로포장재료로의 적용은 미비한 실정이다. 본 연구에서는 재생골재내에 포함된 이물질의 특성에 따라 무기이물질과 유기이물질로 구분하였으며 , 각 이물질이 포장 공용성에 미치는 영향을 제시하였다. 또한 재생골재내에 포함된 무기이물질 함유량과 압축강도와의 관계, 유기이물질 함유량과 수정 CBR과의 상관관계를 통하여 도로포장층인 린콘크리트 기층과 보조기층에 적용 가능한 이물질 함량기준을 제시하였다. 린콘크리트 기층에는 무기이물질 함유량 질량비 10% 이하, 입상재료 보조기층에는 유기이물질 함유량 부피비 2% 이하일 때 재생골재를 포장에 적용 가능한 것으로 나타났다.

To evaluate the remediation performance of recycled oyster shell powders to control nutrients release from polluted sediments. Different types of recycled oyster shell powder were applied on separated bottom sediments. The first type of oyster shell powder is Calcined Oyster Shell Powder (COSP) and another consist of ultrasonicated oyster shell powder (SOSP) which were composed of calcium peroxide. The recycled oyster shell powders were improving the water quality as slow oxygen releasing compound. The experimental results indicated that the Dissolved Oxygen (DO) in the treated columns were higher than the control column. pH was increased in the both experimental columns due to the hydrolysis of CaO2. Meanwhile, recycled oyster shell powders could prevent the nutrients (nitrogen and phosphorus) release from sediments into the overlying water. In addition, the total nitrogen and total phosphorus concentrations of the COSP applied column were decreased 27% and 20% compared to the control column respectively and the SOSP applied column were decreased 33% and 27% compared to control in the overlying water. It was proved that, COSP and SOSP can effectively adsorb phosphorus from sediments and prevent phosphorus release into overlying water from bottom sediments. In conclusion, COSP and SOSP applications was increased DO in the overlying water and nutrient released controlled effectively from the sediment.

The purpose of this study is to investigate the field application of Permeability recycled asphalt using Waste Asphalt Concrete and Resin. After the test construction, it was not cause problem, such as this stripping, falling and crack of pavement. Also, it was confirmed to be performance of equal or higher than of existing technology.

The current study is a basic research to review the possibility of using steel wire from waste tires as recycled steel fiber for construction purposes. It analyzes preexisting waste tire-related data before processing and selecting waste steel wires to compare their composition and three quality standards if appearance as defined by concrete steel fiber regulations (KS F 2564), tensile strength, and flexibility, in order to review the feasibility of reusing waste steel wires. The results showed that the waste steel wires satisfy quality standards stated in the concrete steel fiber regulation (KS F 2564), indicating that they may be reused as recycled steel fiber for concrete.

Based on the study of chloride migration coefficient and hydration heat evolution, it was found that the use of ternary blended cement was effective to achieve desired service life and minimum crack index. On the other hand, a high level of compressive strength is required for marine concrete mix design.

In this study, Analyzed characteristic about permeability cold-mixed recycled asphalt concrete using waste asphalt concrete and MMA. As a result, porosity was 19.4% and permeability coefficient was 0.4cm/sec. Marshall stability test had the highest MMA 4% and a hardener 3%.

The purpose of this study is to examine whether cementitious powder separated from waste concrete can be used as the alternative raw material for limestone and reducing the usage of natural resource (limestone) and CO2emission based on recycling cementitious powder from waste concrete. Therefore, to reduce waste and CO2 emission in the cement industry and develop recycled cement, mix design was deducted by multi-objective optimization.