• Title/Summary/Keyword: blast furnace slag

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Effect of Blast Furnace Slag, Hwang-toh and Reinforcing Fibers on The Physical and Mechanical Properties of Porous Concrete Using Blast Furnace Slag Coarse Aggregate (고로슬래그 골재를 사용한 다공성 콘크리트의 물리·역학적 특성에 미치는 고로슬래그 미분말, 황토 및 보강섬유의 효과)

  • Lee, Jin-Hyung;Park, Chan-Gi
    • Journal of The Korean Society of Agricultural Engineers
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    • v.52 no.5
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    • pp.53-60
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    • 2010
  • The effects of blast furnace slag, hwang-toh, and reinforcing fiber on the physical and mechanical properties of porous concrete using blast furnace slag coarse aggregates have been evaluated in this study. The effect of the depending on replacement ratio of blast furnace slag to cement was investigated such that the replacement ratio was varied to 0 %, 25 % and 50 %. Also, the replacement ratios of hwang-toh were 0, 20 and 30 %. The polyvinyl alcohol fiber was used for the reinforcing fiber. A series of pH, unit mass, and void ratio tests have been performed to study the physical properties of the porous concrete using blast furnace slag coarse aggregates with the polyvinyl alcohol fiber and the replacement ratios of blast furnace slag, hwang-toh, while a series of compressive tests have been performed to evaluate the strength property depending on polyvinyl alcohol fiber and the replacement ratios of blast furnace slag, hwang-toh. The test results indicated that the physical and mechanical properties of porous concrete using blast furnace slag coarse aggregates is affected by the replacement ratio of blast furnace slag, and the fiber contents. According to the tests with polyvinyl alcohol fiber contents, the void ratio was decreased and the compressive strength was upgraded.

Experimental Study on Frost Resistance of High-Strength Concrete Using Granulated Blast-Furnace Slag (고로슬래그 미분말을 흔입한 고강도콘크리트의 내동해성에 관한 실험적 연구)

  • 김무한;권영진;강석표;박선규
    • Journal of the Korea Concrete Institute
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    • v.12 no.4
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    • pp.41-48
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    • 2000
  • This study is to investigate for the frost resistance of high-strength concrete using finely ground granulated blast-furnace slag with experimental parameters, such as water/binder ratio, replacement proportion of granulated blast-furnace slag, air content and methods of curing. The high-strength concrete using granulated blast-furnace slag is effective to resist frost and decrease scaling. The more increasable replacement proportion of granulated blast-furnace slag is, the better the effect is. The high-strength concrete using granulated blast-furnace slag needs hydrating adequately to prevent deterioration by drying in the early curing period. The micro structure of high-strength concrete, increased to the pore number with diameter of 0.03~0.1mm, is changed by using granulated blast-furnace slag, but is presented differently according to water/binder ration and replacement proportion of granulated blast-furnace slag.

Engineering properties of mortar with the variation of blast furnace slag from different production areas (고로슬래그 미분말의 산지별 치환율 변화에 따른 모르타르의 공학적 특성)

  • Park, Jae-Yong;Zhao, Yang;Jung, Sang-Woon;Jo, Man-Ki;Han, Min-Cheol;Han, Cheon-Goo
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2014.05a
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    • pp.206-207
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    • 2014
  • Blast furnace slag is one kind of industrial by-product and was utilized with recycled fine aggregates for the manufacture of zero cement mortar. As the blast furnace slag was from different areas, the strength of the specimen using blast furnace slag showed different performances. In this study, blast furnace slag generated in different areas in Korea has been chosen, fundamental performances of the blast furnace slag blended mortar has been tested to evaluate the quality of the blast furnace slag. Results showed that difference for flowability is limited. As the alkali activation of the blast furnace slag, the compressive strength showed different results. The flexural strength showed little difference when the aggregates and types of blast furnace slag changed.

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The Experimental study on the property of concrete which used Blast furnace slag aggregate (고로슬래그 골재를 사용한 콘크리트 특성에 대한 실험적 연구)

  • 박정우;김상미;김광기;임남기;정상진
    • Proceedings of the Korea Concrete Institute Conference
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    • 2001.05a
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    • pp.489-494
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    • 2001
  • Several studies have reported that Granulated Blast-Furnace Slag improved the properties of concrete. The Granulated Blast-Furnace Slag could be a good alternative in the shortage of aggregate situation. Slag shows the possibility of influential aggregate and effect of environment preservation. This study presents that the basic properties of fresh concrete using Air-cooled Blast-furnace slag aggregate and Water-cooled Blast-furnace slag aggregate. Testing Factors of this study are concrete slump, slump loss, bleeding, and air contents. The result of this study is below. 1) In case of proportion slag and grave is 50 to 50, the biggest slump value is measured. 2) In the concrete using of air-cooled Blast-furnace slag aggregate, the bleeding capacity is a little. In the concrete using of Water-cooled Blast-furnace slag aggregate, the bleeding capacity goes up to 50% increase. 3) As substitution rate of the granulated blast-furnace slag goes up, air content is increased.

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Durability of Alkali-Activated Blast Furnace Slag Concrete: Chloride Ions Diffusion (알칼리 활성 슬래그 콘크리트의 내구성: 콘크리트의 염소이온 확산)

  • Nam, Hong Ki;Kyu, Park Jae;San, Jung Kyu;Hun, Han Sang;Hyun, Kim Jae
    • Journal of the Korean Society of Safety
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    • v.30 no.4
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    • pp.120-127
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    • 2015
  • The aim of the present study is to investigate some characteristics of concrete according to addition of blast furnace slag and alkali-activator dosages. Blast furnace slag was used at 30%, 50% replacement by weight of cement, and liquid sulfur having NaOH additives was chosen as the alkaline activator. In order to evaluate characteristics of blast furnace slag concrete with sulfur alkali activators, compressive strength test, total porosity, chloride ions diffusion coefficient test were performed. The early-compressive strength characteristics of blast furnace slag concrete using a sulufr-alkali activators was compared with those of reference concrete and added 30, 50% blast furnace slag concrete. Also, Blast furnace slag concrete using sulfur-alkali activators enhanced the total porosity, chloride ions diffusion coefficient than two standard concrete. Alkali-activated blast furnace slag concrete was related to total porosity, compressive strength and chloride ions diffusion coefficient each others. As a result, it should be noted that the sulfur-alkali activators can not only solve the demerit of blast furnace slag concrete but also offer the chloride resistance of blast furnace slag concrete using sulfur alkali activators to normal concrete.

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

  • Kim, Sun-A;Kim, Hyeon-Sung;Park, Sun-Gyu
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2018.05a
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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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A Study on the Improvement of an Early-age Quality of Blast-Furnace Slag Concrete (고로슬래그 콘크리트의 초기 품질 하락 극복을 위한 연구)

  • 반성수;최봉주;유득현;전영환;조현태
    • Proceedings of the Korea Concrete Institute Conference
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    • 2000.10b
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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.

A Study on the Surface Activation and Quick-setting Characteristics of Blast Furnace Slag (Blast furnace slag의 표면 활성화 특성 및 quick-setting 특성에 관한 연구)

  • Lee, Woong-Geol;Song, Yung-Sin;Kang, Hyun-Ju;Choi, Hun;Song, Yong-Jin
    • Proceedings of the Korea Concrete Institute Conference
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    • 2010.05a
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    • pp.273-274
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    • 2010
  • This study investigated on the early hydration and physical characteristics of blast furnace slag through pH variation. The pH values applied to the experiments were, 12.0 and 13.0 which are the pH values of OPC, and type 3 of pH 14.0 which is a strong alkali condition. A paste and mortar method was used to test blast furnace slag and blast furnace slag containing 2wt% of gypsum. It was found that CAH and CSH phases were formed as key hydrates during the early hydration of blast furnace slag, and ettringites were produced extra during the early hydration of blast furnace slag containing 2wt% of gypsum.

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

  • Kim, Moo-Han;Kim, Jae-Hwan;Cho, Bong-Suk;Na, Chul-Sung;Kim, Young-Duck
    • Journal of the Korea Institute of Building Construction
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    • v.5 no.1 s.15
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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.

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

  • 김은겸;박천세;전찬기;이호석;최재진
    • Proceedings of the Korea Concrete Institute Conference
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    • 2002.10a
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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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