• Title/Summary/Keyword: $CO_2$ fixation material

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Characterization of Controlled Low Strength Materials Utilizing CO2-fixation Steel Slag and Power Plant Bottom Ash (CO2고정화한 제강슬래그와 발전소 바닥재를 활용한 저강도 고유동 채움재의 특성)

  • Cho, Yong-Kwang;Kim, Chun-Sik;Nam, Seong-Young;Cho, Sung-Hyun;Lee, Hyoung-Woo;Ahn, Ji-Whan
    • Journal of Energy Engineering
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    • v.27 no.2
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    • pp.55-60
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    • 2018
  • In this study investigated the Controlled Low Strength Materials using coal ash and steel slag(KR slag) as the main material in the thermal power plant classified as waste resource. Bottom ash and KR slag are mixed at a ratio of 7: 3 to expand the use of industrial by-products through carbonate($CO_2$-fixation) reactions and inhibit the exudation of heavy metals. The results showed that the water content increased as the content of bottom ash increased. It was confirmed that as the powder content increased, the bleeding ratio decreased. Also, as the content of one kind of ordinary portland cement (OPC) decreased, activation of hydration reaction decreased and compressive strength decreased. However, when the mixed composition is appropriately adjusted, the compressive strength of 2.0 MPa required for the controlled low-strength material can be satisfied.

Photo-autotrophic Behavior of Engineered Living Building Materials (Living Building Material의 광합성 작용을 통한 CO2 흡수 능력 평가)

  • Jang, Indong;Yi, Chongku
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2022.11a
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    • pp.31-32
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    • 2022
  • Unlike conventional building materials, the living building material (LBM) cube is composed of sand, gelatin, and cyanobacteria without cement. The surface of the LBM cube absorbs CO2 from the atmosphere by photosynthesis and is deposited in the form of CaCO3. In addition, the crystals generated in this process strengthened the gelatin-sand structure to enhance the compressive strength.

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An experimental study on carbonation resistance of Mg(OH)2 mixed cement paste (Mg(OH)2 혼입 시멘트 페이스트의 탄산화 저항성에 관한 실험적 연구)

  • Chen, Zheng-Xin;Lee, Yun-Su;Lee, Han-Seung
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2017.05a
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    • pp.165-166
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    • 2017
  • Corrosion of reinforcement is the main factors affecting the durability of reinforced concrete in the world which lead to the failure of structures of reinforced concrete buildings. In this research, mixed brucite(Mg(OH)2) into ordinary portland cement paste in ratio of 5, 10 and 15% as a kind of CO2 fixation material. Samples were exposed to an accelerated carbonation enslavement of 20% CO2 concentration, 60% relative humidity, and a temperature of 20℃ until tested at 3d, 7d, 14d and 28d. After 28d CO2 accelerated curing, in the paste containing MH megnesian calcite was found by XRD and SEM-EDX. Meanwhile, paste containing Mg(OH)2 exhibit the better pore distribution than ordinary portland cement paste and relatively good compressive strength.

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Study on Emission Control for Precursors Causing Acid Rain (VI) : Suitability of Aquatic Plant Biomass as a Co-combustion Material with Coal

  • Hauazawa, Atsushi;Gao, Shidong;Sakamoto, Kazuhiko
    • Asian Journal of Atmospheric Environment
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    • v.2 no.2
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    • pp.102-108
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    • 2008
  • In China, energy and environmental problems are becoming serious owing to rapid economic development. Coal is the most problematic energy source because it causes indoor and outdoor air pollution, acid rain, and global warming. One type of clean coal technology that has been developed is the coal-biomass briquette (or bio-briquette, BB) technique. BBs, which are produced from pulverized coal, biomass (typically, agricultural waste), and a sulfur fixation agent (slaked lime, $Ca(OH)_2$) under high pressure without any binder, have a high sulfur-fixation effect. In addition, BB combustion ash, that is, the waste material, can be used as a neutralization agent for acidic soil because of its high alkalinity, which originates from the added slaked lime. In this study, we evaluated the suitability of alternative biomass sources, namely, aquatic plants, as a BB constituent from the perspective of their use as a source of energy. We selected three types of aquatic plants for use in BB preparation and compared the fuel, handling, and environmental characteristics of the new BBs with those of conventional BBs. Our results showed that air-dried aquatic plants had a higher calorific value, which was in proportion to their carbon content, than agricultural waste biomass; the compressive strength of the new BBs, which depends on the lignin content of the biomass, was high enough to bear long-range intracontinental transport in China; and the new BBs had the same emission control capacity as the conventional BBs.

Pore Structure and Fractal Characters of Cement Mortar Containing γ-C2S (γ-C2S 혼입 시멘트 모르타르의 공극구조 및 Fractal특성)

  • Chen, Zheng-Xin;Lee, Han-Seung
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2017.11a
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    • pp.24-25
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    • 2017
  • Gamma-C2S (γ-C2S) is a substance that is difficult to react with water under normal temperature but can absorb a large amount of CO2 in the air. The addition of γ-C2S to cementitious materials through the curing of CO2 can improve the pore structure and improve the durability of the material. In this study, three kind of Ca-bearing materials : CaO, Ca(OH)2, CaCO3, were calcined 2.5h at 1450℃ to synthesize γ-C2S after mixing with SiO2 respectively. Among them, Ca(OH)2 mixed with SiO2 after calcining shows highest content. Synthesized γ-C2S was added to the cement mortar, after water curing for 1 month, accelerated carbonation test was experimented. After 28d accelerated carbonation test, pore structure will be detectived by MIP. Based on the MIP result, following the calculation method of Fractal theory, the pore structure will be quantitative described.

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Physicochemical Properties of Cement Paste Containing Mg(OH)2 Cured by CO2 curing Method (CO2 양생을 이용한 Mg(OH)2 혼입 시멘트 페이스트의 물리화학적 특성)

  • Chen, Zheng-Xin;Lee, Han-Seung
    • Journal of the Korea Institute of Building Construction
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    • v.18 no.3
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    • pp.203-210
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    • 2018
  • Corrosion of the rebar is one of the main factors affecting the durability of reinforced concrete in the world which lead to the failure of the reinforced concrete structures. In this research, a new method of fixing $CO_2$ is practiced to improve the carbonation resistance of the concrete. Brucite($Mg(OH)_2$), a kind of common $CO_2$ fixation materials, was added into ordinary Portland cement paste. Samples containing 0%, 5%, 10%, and 15% $Mg(OH)_2$ were exposed to an accelerated carbonation curing regime with 20% concentration of $CO_2$, 60% relative humidity, and a temperature of $20^{\circ}C$ until tested at 3d, 7d, 14d and 28d. After 28d of $CO_2$ accelerated curing, in the paste containing $Mg(OH)_2$, magnesian calcite was detected by SEM-EDX. Meanwhile, the paste containing $Mg(OH)_2$ exhibit the better pore distribution than ordinary Portland cement paste and the compressive strength of the cement paste containing $Mg(OH)_2$ were more than 50Mpa.

An Experimental Study on the Resistance to Penetration of Harmful Ions in Surface Coatings Material Containing Organic Corrosion inhibitor (유기계 방청제를 혼입한 표면피복재의 유해이온 침투저항에 관한 실험적 연구)

  • Ryu, Hwa-Sung;Shin, Sang-Heon;Lee, Han-Seung
    • Journal of the Korea Institute of Building Construction
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    • v.17 no.2
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    • pp.157-166
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    • 2017
  • In general, carbonation and chlorine ions are the most harmful causes of deterioration of concrete structures. Recently, a method has been developed to control the corrosion of rebar in concrete containing chloride by impregnating a Surface coating material with a inhibitor. In this study, accelerated carbonation and differential thermogravimetric analysis (TG-DTA) and CASS tests were carried out to evaluate the characteristics of Surface coatings containing Organic Corrosion inhibitors which are excellent in corrosion inhibition and fix degradation causes $CO_2$ and $Cl^-$. As a result of the experiment, TG-DTA analysis and accelerated carbonation showed that $CO_2$ was directly reacted with amine derivative in concrete by the incorporation of Organic Corrosion inhibitor. In other words, $CO_2$ was immobilized and carbonation inhibition effect was confirmed. In addition, in the CASS test, the specimen coated with the Surface coating material containing the Organic Corrosion inhibitor with $Cl^-$ fixing property showed no corrosion until the 28th day and had excellent performance in preventing corrosion of a rebar by the chloride ion.

CO2 Fixation by Magnesium Hydroxide from Ferro-Nickel Slag (페로니켈 슬래그로 부터 제조된 Mg(OH)2를 이용한 CO2 고정화)

  • Song, Hao-Yang;Seo, Jong-Beom;Kang, Seong-Kuy;Kim, In-Deuk;Choi, Bong-Wook;Oh, Kwang-Joong
    • Clean Technology
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    • v.20 no.1
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    • pp.42-50
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    • 2014
  • In this study, the $Mg(OH)_2$ slurry was made form ferro-nickel slag and then used for $CO_2$ sequestration. The experiments were in the order as leaching step, precipitation, carbonation experiments. According to the leaching results, the optimal leaching conditions were $H_2SO_4$ concentration of 1 M and the temperature of 333 K. In the $Mg(OH)_2$ manufacturing step, NaOH was added to increase the pH upto 8, the first precipitation was confirmed as $Fe_2O_3$. After removal the first precipitation, the pH was upto 11, the $Mg(OH)_2$ was generated by XRD analysis. The $Mg(OH)_2$ slurry was used for $CO_2$ sequestration. The pseudo-second-order carbonation model was used to apply for $CO_2$ sequestration. The $CO_2$ sequestration rate was increased by the $CO_2$ partial pressure and temperature. However, $CO_2$ sequestration rate was decreased when temperature upto 323 K. After $CO_2$ sequestrated by $Mg(OH)_2$, the $CO_2$ can be sequestrated stable as $MgCO_3$. This study also presented optimal sequestration condition was the pH upto 8.38, the maximum $MgCO_3$ can be generated. This study can be used as the basic material for $CO_2$ sequestration by ferro-nickel slag at pilot scale in the future.

Mechanical Properties Characteristics according to Heat Treatment Conditions of Medical Bone Plates by 3D Printing (3D프린팅 제조기반 골절합용 금속판의 열처리 조건에 따른 기계적 성능 특성)

  • Jung, Hyunwoo;Park, Sung Jun;Woo, Heon
    • Journal of Biomedical Engineering Research
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    • v.43 no.2
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    • pp.116-123
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    • 2022
  • This study analyzes the Mechanical properties of a medical bone plate by 3D printing. With the recent development of 3D printing technology, it is being applied in various fields. In particular, in the medical field, the use of 3D printing technology, which was limited to the existing orthosis and surgical simulation, has recently been used to replacement bones lost due to orthopedic implants using metal 3D printing. The field of application is increasing, such as replacement. However, due to the manufacturing characteristics of 3D printing, micro pores are generated inside the metal printing output, and it is necessary to reduce the pores and the loss of mechanical properties through post-processing such as heat treatment. Accordingly, the purpose of this study is to analyze the change in mechanical performance characteristics of medical metal plates manufactured by metal 3D printing under various conditions and to find efficient metal printing results. The specimen to be used in the experiment is a metal plate for trauma fixation applied to the human phalanx, and it was manufactured using the 'DMP Flex 100(3D Systems, USA), a metal 3D printer of DMLS (Direct Metal Laser Sintering) method. It was manufactured using the PBF(Powder Bed Fusion) method using Ti6Al4V ELI powder material.

Synthesis and Biocompatibility Study of Hydrogel for Patch Sensor in Non-invasive Glucose Monitoring System (무채혈 혈당 측정시스템의 Patch Sensor용 수화젤의 합성 및 생체적합성에 관한 연구)

  • Kwon, Jeong-Woo;Kim, Dong-Chul;Yoon, In-Joon;Jeong, Yoon-Na;Jeong, Ji-Young;Hwang, In-Sik
    • Polymer(Korea)
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    • v.33 no.2
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    • pp.111-117
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    • 2009
  • This study aims to verify for humans the suitability of the enzyme-fixed hydrogel used for the patch sensor of the blood sugar testing system without blood sampling, which utilizes reverse iontophoresis. Using acrylate monomers, hydrogel was synthesized to which a certain unit of enzyme is fixed. In order to analyze the material property of the synthesized hydrogel, a structural analysis was performed using FT-IR spectroscopy, while the DSC was used to verify the thermal stability. In addition, with the UV-Vis spectrophotometer, it was verified that the degree of active enzyme is at least 50% greater than the standard product. The SEM was used to verify secure fixation of the enzyme onto the surface. As a result, it was observed that the enzyme is successfully fixed to the surface. Since the hydrogel makes direct contact with a patient's skin, it is essential to evaluate the toxicity when making direct contact with the skin. For that purpose, various sets of tests were undertaken according to the ISO 10993-cytotoxicity, intracutaneous reactivity, skin irritation test and maximization sensitization. Consequently, it was successfully verified that the enzyme-fixed hydrogel have bioavailability.