• 제목/요약/키워드: blast furnace

검색결과 1,374건 처리시간 0.033초

아크방전에 의해 표면개질 된 고로슬래그를 사용한 시멘트 경화체의 수화 특성 (Hydration Properties of Cement Matrix using Surface Treatment Blast Furnace Slag by Arc Discharge)

  • 김선아;김현성;박선규
    • 한국건축시공학회:학술대회논문집
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    • 한국건축시공학회 2018년도 춘계 학술논문 발표대회
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    • pp.91-92
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    • 2018
  • A glassy thin film was formed on the surface of the blast furnace slag. When blast furnace slag is used as an admixture of concrete, addition of alkali activators were required. However, alkali activators are not only dangerous as chemical products, but they are also difficult to use as expensive materials. Therefore, it is necessary to study the way of removal of the glassy thin film of blast furnace slag without the risk and cost increase. In this study, to solve this problem, experiment was carried out to improve the hydration reactivity by treatment the surface of blast furnace slag using arc discharge. Experimental results show that when the surface of the blast furnace slag was tratmented by arc discharge, the glassy thin film was destroyed. And the hydration reactivity was improved, the compressive strength was increased.

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고로슬래그 콘크리트의 초기 품질 하락 극복을 위한 연구 (A Study on the Improvement of an Early-age Quality of Blast-Furnace Slag Concrete)

  • 반성수;최봉주;유득현;전영환;조현태
    • 한국콘크리트학회:학술대회논문집
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    • 한국콘크리트학회 2000년도 가을 학술발표회 논문집(II)
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    • pp.1215-1220
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    • 2000
  • Blast-Furnace Slag, a by-product of the iron or steel industry, has potential sa a cementitious material. The addition of a Blast-Furnace Slag generally reduces the heat of hydration and can confer significant improvements in resistance to sulfate attack and alkali-aggregate reaction, as well as increases in ultimate strength. But it also reduces early-age strength. In this study, for the purpose of improvement of early-age quality of Blast-Furnace Slag concrete, we choose blaine fineness of $6, 000~8, 000cm^2/g$ of Blast-Furnace Slag, and investigate the various properties of concrete. As a result, workability and early-age strength of Blast-Furnace Slag concrete were improved according to the increase of blaine fineness of Blast-Furnace Slag.

Injection of Waste Plastics into the Blast Furnace and Its Effect on Furnace Conditions

  • Heo, Nam-Hwan;Baek, Chan-Yeong;Yim, Chang-Hee
    • 대한전자공학회:학술대회논문집
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    • 대한전자공학회 2001년도 The 6th International Symposium of East Asian Resources Recycling Technology
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    • pp.755-758
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    • 2001
  • Most of the waste plastics are incinerated and landfilled now, leading to much environmental problems. The technology of injection into the blast furnace was developed as a useful recycling method of waste plastics, and applied to the actual operation in several ironmaking companies. We carried out the test operation to inject continuously the two kinds of waste plastics through four tuyeres of the Foundry blast furnace in POSCO by 130 ton of total amount. From this test operation, we analyzed the coke replacement ratio, the permeability, the heat load and other changes of furnace conditions with the injection of waste plastics into the blast furnace. Some trials based upon the theoretical approaches were applied to examine the efficiencies of blast furnace.

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고로슬래그미분말의 분말도 및 대체율에 따른 콘크리트의 공학적 특성 및 내구특성에 관한 실험적 연구 (An Experimental Study on the Engineering Properties and Durability of Concrete According to the Fineness and Replacement Ratio of Blast-Furnace Slag)

  • 김무한;김재환;조봉석;나철성;김영덕
    • 한국건축시공학회지
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    • 제5권1호
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    • pp.81-88
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    • 2005
  • As a part of efforts for conformity of demand to high quality of concrete and for solution of economic problem, blast-furnace slag has been utilized by means of cement replacement. With utilization of blast-furnace slag, superior performance can be ensured, environmental pollution can be prevented and economical advantage can be obtained. But blast-furnace slag has a lot of disadvantages like retardation of strength manifestation etc. in field construction, so properties examination of concrete using blast-furnace slag instead of cement is necessary. For upper necessity, it is planed that basic data for utilization and performance management of blast-furnace slag by means of cement replacement is presented with experimental comparison and investigation of engineering properties of concrete according to the replacement ratio and fineness of blast-furnace slag.

Numerical Modelling of Temperature Distribution and Pressure Drop through the Layered Burden Loading in a Blast Furnace

  • Yang, Kwang-Heok;Choi, Sang-Min;Chung, Jin-Kyung
    • 한국연소학회지
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    • 제14권4호
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    • pp.1-6
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    • 2009
  • Analysis of the internal state of the blast furnace is necessary to predict and to control the operating conditions. Especially, it is important to develop models of the blast furnace to predict the cohesive zone because shape of the cohesive zone influences overall operating conditions of blast furnace such as gas flow, chemical reactions and temperature. Because many previous blast furnace models have assumed cohesive zone to be fixed, it was not possible to evaluate the shape change of cohesive zone in relation with operating conditions such as PCR, blast condition, and production rate. In this study, an axi-symmetric 2-dimensional steady state model is proposed to simulate blast furnace processes. In this model, cohesive zone is determined by the solid temperature. Finite volume method is employed for numerical simulation. To find location of the cohesive zone, entire calculation procedure is iterated until converged. Through this approach, shape of the cohesive zone, velocity and temperature within the furnace are predicted from the model.

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Application of artificial intelligence to blast furnace operating control system

  • Yoshikawa, Hajime;Ukai, Tsuyoshi
    • 제어로봇시스템학회:학술대회논문집
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    • 제어로봇시스템학회 1993년도 한국자동제어학술회의논문집(국제학술편); Seoul National University, Seoul; 20-22 Oct. 1993
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    • pp.115-120
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    • 1993
  • It is difficult to establish a mathematical furnace model and automatic-fumace control because of the difficulty in direct measurement of the inner condition of a blast furnace. To solve this problem, we has developed and actually operated a blast furnace operation control system using artificial intelligence tool to be applied to the blast furnace process computer system. Since this system has a function of automatic Treat level control, higher practicality has been proved than the previous guidance-level expert system. This paper introduces an outline of the system and the result of application.

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고로슬래그를 이용한 고강도콘크리트의 내동해성에 관한 실험적 연구 (An Experimental Study on the Frost Resistance of High-Strength Concrete using Blast-Furnace Slag)

  • 박선규;유재강;강석표;권영진;김무한
    • 한국콘크리트학회:학술대회논문집
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    • 한국콘크리트학회 1999년도 학회창립 10주년 기념 1999년도 가을 학술발표회 논문집
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    • pp.671-674
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    • 1999
  • With increasing content of granulated blase furnace slag in cement, the content of capillary pores in the mortar decreases and later age strength of the concrete. Therefore, this provides greater reserves study is carried out to estimate frost resistance of high-strength concrete specimens with water cement ratios using blast-furnace slag. 1. Blast furnace concrete is comparatively more good frost resistance than normal concrete. 2. As the blast furnace slag increases, the quantity of pores with a radius of more than 30nanometer decreses.

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고로슬래그미분말을 사용한 고유동콘크리트의 특성 (Properties of Self Compacting Concrete Using Ground Granulated Blast Furnace Slag)

  • 김은겸;박천세;전찬기;이호석;최재진
    • 한국콘크리트학회:학술대회논문집
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    • 한국콘크리트학회 2002년도 가을 학술발표회 논문집
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    • pp.579-584
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    • 2002
  • In this research, the physical properties of self compacting concrete using ground granulated blast furnace slag as a part of cement were investigated. Concrete using ground granulated blast furnace slag was prepared with various ground granulated blast furnace slag replacement(20~80 volume %) for cement and the quantities of coarse aggregate in concrete were 50%, 55% and 60% of ratio of absolute volume of coarse aggregate. The workability, flowing characteristics, air content and compressive strength of concrete using ground granulated blast furnace slag were tested and the results were compared with those of ordinary portland cement concrete. In the experiment, we acquired satisfactory results at the point of flowing characteristics and strengths of concrete using ground granulated blast furnace slag within tile replacement ratio of 50% and the optimum quantity of coarse aggregate in concrete was found to be 50%~55% of ratio of absolute volume of coarse aggregate.

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고로슬래그 미분말을 다량 치환한 모르타르의 압축강도 평가 (Evaluation of Compressive Strength of Mortar Replaced to High Volume Blast Furnace Slag)

  • 이보경;김규용;이세범;이병천;신경수;김홍섭
    • 한국건축시공학회:학술대회논문집
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    • 한국건축시공학회 2012년도 추계 학술논문 발표대회
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    • pp.103-105
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    • 2012
  • With blast-furnace slag is a by-product generated when pig iron is produced. It has been used as the concrete admixture due to high reactivity. However, It causes low strength development during early age. In order to make up for this drawback, in this study, we evaluated compressive strength of mortar replaced with high volume blast-furnace slag. Experimental results, Compressive strength of mortar based on blast-furnace slag is affected by cement type, substitution rate of blast-furnace slag and pH after mixing.

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슬래그모래를 사용한 모르터의 압축강도특성 비교에 관한 실험적 연구 (A Experimental Study on the Comparison of the Compression Strength Characteristics of Mortar using the Blast-Furnace Slag Sand)

  • 김종락;김성식;이복만;임남기;정상진
    • 한국콘크리트학회:학술대회논문집
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    • 한국콘크리트학회 1999년도 봄 학술발표회 논문집(I)
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    • pp.40-45
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    • 1999
  • This experimental study presents the strength properties of mortar using the blast-furnace slag sand. The mix disign of this study is based on the each three classes of unit water; (250, 275, 300)kg/㎥ and four classes of W/C; (45, 50, 55, 60)% and substitution rate(0, 25, 50, 75, 100)%. It gives following result. As W/C ratio increase, the strength is decrease. In case of mortar using air-cooled blast-furnace slag sand, the 3-days and 7-days compression strength is increase as substitution rate is higher. But in case of the mortar using the quenched blast-furnace slag sand, the compression strength is decrease as substitution rate is higher.

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