• Title/Summary/Keyword: GGBF Slag

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The properties of mortar using ground granulated blast-furnace slag (고로슬래그 미분말을 사용한 모르타르의 물성)

  • 김태형;김종인;최영화
    • Proceedings of the Korea Concrete Institute Conference
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    • 1998.04a
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    • pp.105-110
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    • 1998
  • The propose of this study is to examine the mechanical properties of mortar using ground granulated blast-furnace(GGBF) slag. In this study, the mortar replaced by varying fineness and content of GGBF slag is investigated through the change of compressive strength, chemical resistance and weight loss. As the result, it has been found that GGBF slag increase somewhat higher flow value and compressive strength. In addition, the chemical resistance of motar using GGBF slag shows higher flow that of motar not containing GGBF slag.

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Strength of Alkali-Activated GGBF Slag Mortar (활성제를 사용한 슬래그 미분말 혼합 모르타르의 강도)

  • 문한영;신화철;권태석
    • Proceedings of the Korea Concrete Institute Conference
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    • 2001.05a
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    • pp.481-486
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    • 2001
  • Ground granulated blast-furnace slag shows very high strength when proper alkali-activator exists. This paper deals with setting time, heat evolution rate and the strength development of alkali-activated slag cement activated by KOH, Ca(OH$)_{2}$, $Na_{2}$ $So_{4}$ , and alum(potassium aluminum sulfate). Alkali-activated slag mortar is studied by comparison with GGBF slag cement mortar. The experimental results indicate that for moisture curing at $25^{\circ}C$, the addiction of either 4% $Na_{2}$ $So_{4}$ or 4% alum increases the strength of GGBF slag cement mortar consisting of 50% GGBF slag and 50% portland cement at early age. Strength of activated GGBF slag cement mortars at 1, 3 and 7 days exceeded that of GGBF slag cement mortar. A conduction calorimeter was used to monitor early age hydration.

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A Study on the Fundamental Properties of Mortar Using Ground Granulated Blast Furnace Slag (고로슬래그 미분말을 사용한 모르터의 기초물성에 대한 연구)

  • 문한영;최연왕;류재석
    • Proceedings of the Korea Concrete Institute Conference
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    • 1992.10a
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    • pp.19-24
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    • 1992
  • The purpose of this study is to examine ground granulated blast furnace(GGBF) slag produced in the country for concrete additive through physical and chemical alalysis. In this study, mortar using ordinary portland cement a part of which was replaced with GGBF slag is investigated through fundamental experiment. As the result , it was found that GGBF slag increased to some extent flow value and strength of mortar.

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Properties of Antiwashout Underwater Concrete Using the GGBF Slag (고로슬래그미분말을 활용한 수중불분리성콘크리트)

  • 문한영;김성수;이병덕;이재준
    • Proceedings of the Korea Concrete Institute Conference
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    • 1998.10c
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    • pp.83-86
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    • 1998
  • Recently, underwater concrete constructions are increasing. Therefore it is considered important to control the quality of underwater concrete. In this paper, we have an intention of evaluating fundamental properties of underwater concrete using the Ground Granulated Blast Furnace Slag (GGBF Slag). Thus, it has been investigated that the slump flow of the concrete, pH value and suspended solids in solution, compressive strength on both of specimens made above and below water. Also the percentage of GGBF Slag was found to alter the filling-up in underwater concrete.

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A Study on the Fundamental Properties of High-Strength Concrete Using Ground Granulated Blast-Furnace Slag as an Admixture (고로슬래그 분말을 혼화재로 사용한 고강도콘크리트의 기초적 성질에 대한 연구)

  • 문한영;최연왕;문대중;송용규
    • Proceedings of the Korea Concrete Institute Conference
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    • 1995.04a
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    • pp.30-35
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    • 1995
  • This paper presents fundamental experiment for the properties of high performance concrete in its fresh and hardened state made with ground granulated blast-furnace (GGBF) slag. The result is that the effect of decreasing xoncrete temperature is to the mixing ratio of GGBF slag, but it presents disadvantage in the slump loss phase. In addition to, we know that the splitting tensile strength, compressive strength and elastic modulus of concrete mixed with high fineness GGBF slag are increased at age 28days.

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High-strength Antiwashout Underwater Concrete Containing the GGBF Slag (고로슬래그 미분말을 혼합한 고강도 수중불분리성 콘크리트)

  • 문한영;송용규;전중규;김태욱
    • Proceedings of the Korea Concrete Institute Conference
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    • 1999.10a
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    • pp.199-202
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    • 1999
  • Recently, the antiwahout underwater concrete with an natiwashout admixture has been increasingly used for underwater structures. However, the credibility of antiwahout underwater concrete was brought up as problems because it was seldom applied to fields. In this study, experiments were made on the basic properties of antiwashout underwater concrete replaced with GGBF Slag from 40% to 60% to improve its properties. Resultant to the test, we got the results as follows; the difference of U-type heght was decreased, and the slump flow was increased. Whereas the amount of suspended solids became high as to increasing the replacement ratio of GGBF Slag, pH value became low. Beacause the ratio of compressive strengths (in water compared to in air) at 28days was obtained over 90%, its value is satisfied with 70% of a criterion.

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Early Prediction of Concrete Strength Using Ground Granulated Blast Furnace Slag by Hot-Water Curing Method (열수양생법에 의한 고로슬래그미분말 혼합 콘크리트의 강도 추정)

  • Moon Han-Young;Choi Yun-Wang;Kim Yong-Gic
    • Journal of the Korea Concrete Institute
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    • v.16 no.1 s.79
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    • pp.102-110
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    • 2004
  • Recently, production cost of ready mixed concrete(remicon) has been increased due to the rising cost of raw materials such as cement and aggregate etc. cause by the upturn of oil price and increase of shipping charge. The delivery cost of remicon companies, however, has been decreased owing to their excessive competition in sale. Consequently, remicon companies began to manufacture the concrete by mixing ground granulated blast furnace slag(GGBF) in order to lower the production cost. Therefore, the objective of this study was to predict 28-day strength of GGBF slag concrete by early strength(1 day-strength, 7 day-strength) for the sake of managing with ease the quality of remicon. In experimental results, the prediction equation for 28 day-strength of GGBF slag concrete could be produced through the linear regression analysis of early strength and 28 day-strength. In order to acquire the reliability, all mixture were repeated as 3 times and each mixture order was carried out by random sampling. The prediction equation for 28 day-strength of GGBF slag concrete by 1-day strength(hot-water method) won the good reliability.

Compressive strength prediction of concrete using ground granulated blast furnace slag by accelerated testing (촉진양생법에 의한 고로슬래그 미분말 혼합 콘크리트의 압축강도 예측)

  • Kim, Yong Jic;Kim, Young Jin;Choi, Yun Wang
    • Journal of the Korean Recycled Construction Resources Institute
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    • v.4 no.4
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    • pp.91-98
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    • 2009
  • Recently, production cost of ready mixed concrete has been increased due to the rising cost of raw materials such as cement and aggregate etc. cause by the upturn of oil price and increase of shipping charge. The delivery cost of ready mixed concrete companies, however, has been decreased owing to their excessive competition in sale. Consequently, ready mixed concrete companies began to manufacture the concrete by mixing ground granulated blast furnace slag(GGBF) and fly-ash in order to lower the production cost. Therefore, the objective of this study was to predict 28 days strength of GGBF slag concrete by early strength(warm and hot water curing method) for the sake of managing with ease the quality of ready mixed concrete. In experimental results, the prediction equation for 28 days compressive strength of GGBF slag concrete could be produced through the linear regression analysis of early strength and 28 days strength. In order to acquire the reliability, all mixture were repeated as 3 times and each mixture order was carried out by random sampling. The prediction equation for 28 days strength of GGBF slag concrete by 1 day compressive strength(accelerated testing) according to warm and hot water curing method won the good reliability.

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Mechanical Properties of Early Strength Mortar with Ground Granulated Blast Furnace Slag and Expansive Additive (고로슬래그미분말 및 팽창재를 혼입한 조강형 모르타르의 역학적 특성)

  • Koo, Kyung-Mo;Choi, Jae-Won;You, Byeong-Know;Cha, Wan-Ho;Kang, Bong-Hee
    • Journal of the Korean Recycled Construction Resources Institute
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    • v.9 no.2
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    • pp.177-184
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    • 2021
  • In this study, the effects of ground granulated blast furnace slag(GGBFS) and expansive additive(EA) on early strength mortar were examined for the purpose of reducing carbon and improving cement performance. As a result, ealry strength Portland cement(EPC) tended to decrease in flow compared to ordinary Portland cement(OPC), but binder with EPC and GGBFS was possible to obtain higher liquidity than OPC. EPC showed higher compressive strength and shrinkage than OPC. The compressive strength of specimen with EPC and GGBFS was reduced proportionally to the replacement ratio of GGBFS. The replacement ratio of GGBFS above the compressive strength equivalent to OPC was higher under low temperature conditions. The use of GGBFS resulted in high shrinkage compared to OPC, and this characteristic was even greater under low temperature conditions. The shrinkage of specimen with EA was decreased in early ages, but was higher than the OPC in long-term ages.

A Study on the Quality of Ground Granulated Blast Furnace Slag as a Mineral Admixture for Concrete (콘크리트용 혼화재(混和材)로서 고로(高爐)슬래그 미분말(微粉末)의 품질(品質)에 대한 연구(研究))

  • Moon, Han Young;Choi, Yun Wang
    • KSCE Journal of Civil and Environmental Engineering Research
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    • v.14 no.4
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    • pp.721-728
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    • 1994
  • The objective of this research is to analyze whether the ground granulated blast furnace (GGBF) slag, by-product of industry in domestic iron-foundary, can be useful as a mineral admixture for concrete by investigating physical and chemical property. In addition, according to making an fundamental experiment on mortar and concrete mixed with GGBF slag to some grade, examining the consistency, the compressive strength and the resistance to sulfate attack of concrete and mortar, the acquired results are that the compressive strength was increased and the resistance to sulfate attack was predominant.

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