• Title/Summary/Keyword: 페로니켈 슬래그

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A Study on Strength and Durability of Vibrated and Rolled Method Mortar Mixed with Desulfurized Gypsum and Ferronickel Slag Fine Powder (탈황석고와 페로니켈슬래그 미분말을 혼합한 진동전압방식 모르타르의 강도 및 내구성에 관한 연구)

  • Yoo, Jeong-Hwan;Park, Sang-Soon
    • Journal of the Korean Recycled Construction Resources Institute
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    • v.9 no.4
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    • pp.545-552
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    • 2021
  • In this study, strength and durability evaluations are performed on vibrated-rolled method mortar mixtures containing desulfurized gypsum and ferronickel slag powder. Desulfurized gypsum and ferronickel slag fine powders were substituted for 25% limestone fine powders u sed in the manu factu re of VR tu bes, and mortar specimens were prepared u sing vibrated-rolled method. Accordingly, flexural and compressive strengths were performed to evaluate the strength, and chlorine ion penetration resistance and sulfuric acid resistance tests were performed to evaluate durability. Flexural and compressive strength were improved in the range 20 to 60% of desu lfu rized gypsu m among admixtu res, and the amou nt of passing charge decreased in the choride ion penetration resistance test in the range of 20 to 80% of desulfurized gypsum. As for the resistance to su lfu ric acid, when the proportion of desu lfu rized in the admixtu re was 40%, the strength and weight change rate according to the immersion period was reduced. Appropriate use of desulfurized gypsum and ferronickel slag powder is expected to improve performance in terms of strength and durability.

Consideration on the Application of Low-Heat Concrete with Ferronickel Slag Aggregate to LNG Storage Tank (페로니켈슬래그 골재를 활용한 저발열 콘크리트의 LNG 저장탱크 적용성 검토)

  • Sang Hyeon Cheong;Sukhoon Pyo;Hyeong-Ki Kim
    • Journal of the Korean Recycled Construction Resources Institute
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    • v.12 no.1
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    • pp.17-24
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    • 2024
  • The characteristics of low-heat concrete, mixed with ground blast furnace slag and ferronickel slag aggregate, were analyzed. Moreover, the applicability of this concrete for mass concrete in LNG storage tanks was examined. Initially, the study investigated the characteristics of fresh and hardened concrete. Subsequently, the temperature rising curve was obtained. Utilizing the obtained parameters from the curves, a series of thermal stress analyses for the LNG storage tank were conducted to assess the risk of cracking. The results confirmed that concrete mixtures incorporating ground blast furnace slag and ferronickel slag aggregate not only exhibited sufficient workability but also achieved a compressive strength of approximately 40 MPa within 28 days. Furthermore, the concrete demonstrated a lower terminal heat rise and a faster heat generation rate compared to low-heat Portland cement concrete. An analysis of thermal stress in various sections of the LNG tank validated a low risk of cracking.

An Experimental Study on Detecting materials of GPR for Maintenance of Restored Cavities (복구된 공동의 유지관리를 위한 GPR 탐사용 탐지물질에 관한 실험적 연구)

  • Park, Jeong Jun;Shin, Eun Chul;Park, Kwang Seok;Shin, Hee Soo;Hong, Gigwon
    • Journal of the Society of Disaster Information
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    • v.14 no.4
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    • pp.430-439
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    • 2018
  • Purpose: The purpose of this study is to verify the effectiveness of maintenance method using GPR exploration by buried detective materials in the ground for efficient maintenance of recovered cavities. Method: EMI sheet, EMI paint, and ferronickel slag were used as the detection materials, and the experiment was conducted by varying the size and depth of the buried detectable material. Results: As a result of the exploration, Detectable influence range by GPR exploration was found depending on the size and depth of buried detectable material in all materials, and the possibility of using it as a detection material was confirmed.

A Study on the Properties of Hwangto Permeable Block Using Ferro Nickel Slag (페로니켈슬래그를 혼입한 황토투수블럭 물성에 관한 연구)

  • Kim, Soon-Ho
    • Journal of the Korea Institute of Building Construction
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    • v.22 no.6
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    • pp.607-618
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    • 2022
  • This study involves the development of a Hwangto permeable block for rainwater storage tanks. The permeable products that form continuous voids between Hwangto binders and aggregates are fine milled slag powder, which is an industrial by-product generated during the production of Hwangto and iron, and ferro nickel slag. The properties of Hwangto permeable blocks were studied using recycled resource aggregates. The target quality is based on KSF 2394. The Hwangto permeable block for a rainwater storage tank is made of water-permeable material, and the permeability of the Hwangto permeable block itself is 0.1mm/sec or higher, with a physical performance of over 5.0MPa in flexural strength and over 20.0MPa in compressive strength. The physical properties of Hwangto permeable block for rainwater storage tanks were researched and developed. In order to prevent flooding due to heavy rain in summer and the urban heat island phenomenon due to depletion of ground water, continuous pores are formed in the block to secure a permeability function to prevent rainwater from accumulating in the pavement of the floor, and to prevent slippage for comfortable and safe storage.

Phosphorus Adsorption Characteristic of Ferronickel and Rapid Cooling Slags (페로니켈슬래그와 제강급랭슬래그의 인 흡착특성)

  • Park, Jong-Hwan;Seo, Dong-Cheol;Kim, Seong-Heon;Park, Min-Gyu;Kang, Byung-Hwa;Lee, Sang-Won;Lee, Seong-Tae;Choi, Ik-Won;Cho, Ju-Sik;Heo, Jong-Soo
    • Korean Journal of Environmental Agriculture
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    • v.33 no.3
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    • pp.169-177
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    • 2014
  • BACKGROUND: The ferronickel and rapid cooling slags used in present study are industrial wastes derived from a steel factory in Korea. These slags are used as almost road construction materials after magnetic separation. However, the use of slag to remove phosphorus from wastewater is still a relatively less explored. The objective of this work was to evaluate the feasibility of ferronickel slag (FNS) and rapid cooling slag (RCS) as sorbents for phosphorus removal in wastewater. METHODS AND RESULTS: Adsorption experiments were conducted to determine the adsorption characteristics of the FNS and RCS for the phosphorus. Adsorption behaviour of the phosphorus by the FNS and RCS was evaluated using both the Freundlich and Langmuir adsorption isotherm equations. FNS and RCS were divided into two sizes as effective sizes. Effective sizes of FNS and RCS were 0.5 and 2.5 mm, respectively. The adsorption capacities (K) of the phosphorus by the FNS and RCS were in the order of RCS 0.5 (0.5105) > RCS 2.5 (0.3572) ${\gg}$ FNS 2.5 (0.0545) ${\fallingdotseq}$ FNS 0.5 (0.0400) based on Freundlich adsorption isotherm. The maximum adsorption capacities (a; mg/kg) of the phosphorus determined by the Langmuir isotherms were in the order of RCS 0.5 (3,582 mg/kg) > RCS 2.5 (2,983 mg/kg) > FNS 0.5 (320 mg/kg) ${\fallingdotseq}$ FNS 2.5 (187 mg/kg). RCS 0.5 represented the best sorbent for the adsorption of phosphorus. In the experiment, the Langmuir model showed better fit with our data than the Freundlich model. CONCLUSION: This study indicate that the use of RCS in constructed wetlands or filter beds is a promising solution for phosphorus removal via adsorption and precipitation mechanisms.

Fluidity and strength characteristics of no-cement composite applied with ferronickel slag powder according to curing temperature (양생온도에 따른 페로니켈슬래그 미분말 적용 무시멘트 복합체의 유동성 및 강도특성)

  • Kim, Chae-Young;Yoon, Joo-Ho;Park, Jeong-Yeon;Park, Gwan-Hong;Lee, Jae-In;Choi, Se-Jin
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2023.11a
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    • pp.193-194
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    • 2023
  • Recently, research is being conducted on geopolymers using industrial by-products as a cement substitute to reduce carbon dioxide emissions from the construction industry. Since geopolymers use industrial by-products, their performance varies depending on the type of alkali activator used, curing temperature, etc. Therefore, as part of a study to reduce carbon dioxide emissions from the construction industry, this study mixed blast furnace slag powder and ferronickel slag powder as cement substitutes, and compared and analyzed the fluidity and compressive strength of no-cement composites according to curing temperature.

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Applicability of Ferro-nickel Slag Sand for Dry Mortar in Floor (페로니켈슬래그 잔골재의 바닥용 건조모르타르 적용성 평가)

  • Cho, Bong-Suk;Kim, Won-Ki;Hwang, Yin-Seong;Koo, Kyung-Mo
    • Journal of the Korea Institute of Building Construction
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    • v.19 no.2
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    • pp.105-112
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    • 2019
  • Fine aggregate made of ferronickel slag(FNS) is similar to natural fine aggregates and is used in concrete structures both domestically and abroad, but its applications and research areas are limited. In this research, in order to expand the availability of FNS and improve the performance of cement mortar products, the applicability of FNS on dry mortar for floor was examined. Experimental results show that FNS improves flow of cement mortar because it has low absorption rate, spherical shape, and glassy surface. Also, the high stiffness of the FNS aggregate itself is considered to contribute to the improvement of cement mortar quality such as crack reduction by improving the compressive strength and shrinkage reducing. In addition, when FNS fine aggregate is applied, it was possible to secure the impact sound insulation performance equal to or higher than that of mortar using natural fine aggregate.

Freeze-Thaw Resistance of Alkali Activated Ternary Blended Cement Incorporated with Ferronickel Slag (알칼리 활성화제를 첨가한 페로니켈슬래그 혼입 삼성분계 콘크리트의 동결융해 저항성)

  • Cho, Won-Jung;Park, Kwang-Pil;Ann, Ki-Yong
    • Journal of the Korean Recycled Construction Resources Institute
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    • v.10 no.2
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    • pp.159-167
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    • 2022
  • The present study assessed the micro structure and durability characteristics of ternary blended cement with different types of alkali activators. Ground granulated blast furnace slag(GGBS) and ferronickel slag(FNS) was replaced until 50 % of the weight of cement. In addition, potassuim hydroxide and sodium hydroxide were used for comparing the properties of different type of alkali activator. Ternary blended cement with alkali activators showed higher peak portlandite peak than that of OPC(Ordinary Portlande Cement) and non activated ternary blended cement. Also, there was no new hydration products in ternary blended cement or/and alkali activators. Based on the mercury intrustion porosimetry(MIP) test result, ternary blended cement increased macro pore while alkali activated ternary blended cement modified pore structure and increased microp pore as compared to OPC as control. Combination with alkali activators is desirable to enhance the compressive strength and freeze thaw resistance.

Application of Ferronickel Slag Aggregate to Improve Workability and Strength of Non-Sintered Cement Mortar (비소성 시멘트 모르타르의 작업성 및 강도 개선을 위한 페로니켈슬래그 골재의 적용방안)

  • Jang, Kyung-Soo;Na, Hyeong-Won;Hyung, Won-Gil
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2023.05a
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    • pp.309-310
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    • 2023
  • Slag and ash generally have a higher powder degree than portland cement, so workability may deteriorate under the same unit quantity condition, and strength and durability decrease when the unit quantity is increased. At this time, if an aggregate having a low water absorption and an appropriate particle size is used to recover the loss of strength, it can contribute to reducing the unit quantity of the binder. Therefore, for the purpose of improving the workability and strength of non-sintered cement mortar using slag and ash, ferro nikel slag whose particle size was adjusted was used as an aggregate and its applicability was identified. In this experimental condition, it was confirmed that non-sintered cement mortar tends to improve workability and secure strength when ferro nikel slag having various particle size distributions is used as an aggregate. This can be analyzed as the effect of ferro nikel slag material properties including glassy properties and mixing conditions with a wide particle size distribution.

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