• Title/Summary/Keyword: fly ash/slag

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An Experimental Study on the Engineering Properties of the Three Components Middle Fluidity Concrete (3성분계 중유동 콘크리트의 공학적 특성에 관한 실험적 연구)

  • 김갑수;조봉석;윤종기;윤문기;장종호;김무한
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2003.05a
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    • pp.9-12
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    • 2003
  • High flowing concrete has not spread whole in the normal concrete structure, because it requires special quality control technique. And recently owing to the lack of natural resources and reinforcement of environmental standard, the construction cost of cement is increased rapidly. Also remicon industry has gone through various economical difficulty as the manufacture cost of concrete is increased. So, the purpose of this study is to evaluate the qualities of middle fluidity concrete using the fly-ash and portland blast-furnace slag cement in order to decrease the amount of cement and resolve the problem of the quality control of high flowing concrete and the manufacture cost. The results of this study show that it reduce the amount of addition of superplasticizer and develope properties of concrete to the use the fly-ash and portland blast-furnace slag cement.

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Performance Characteristics of Mortar with High Volume SCM Depending on Combinations of FA and BS (혼화재 다량치환 상태에서 FA 및 BS의 혼합비율에 따른 모르타르의 품질특성)

  • Kim, Min-Sang;Song, Yuan-Lou;Park, Seong-Bae;Han, Dong-Yeop;Han, Min-Cheol;Han, Cheon-Goo
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2016.05a
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    • pp.126-127
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    • 2016
  • In this research, the optimum combination of fly ash (FA) and blast furnace slag (BS) was deduced by analyzing the performance of high volume supplementary cementitious materials (SCMs) cement mortar depending on various combinations of cement, FA, and BS. As a result, increased workability was shown with increased the portion of FA, while air content, setting time, and compressive strength were decreased.

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Physical and Mechanical Properties of Permeable Polymer Concrete Utilizing industrial By-Products

  • Sung, ChanYong;Kim, In Su
    • Magazine of the Korean Society of Agricultural Engineers
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    • v.42
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    • pp.78-84
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    • 2000
  • Permeable polymer concrete can be applied to roads, sidewalks, river embankment, drain pipes, conduits, retaining walls, yards, parking lots, plazas, interlocking blocks, etc. This study is to explore a possibility of utilizing industrial by-products, a blast furnace slag and a fly ash, as fillers for permeable polymer concrete. Different mixing proportions are tried to find an optimum mixing proportion of permeable polymer concrete. The tests are carried out at 20$\pm$1$^{\circ}C$ and 60$\pm$2$^{\circ}C$ relative humidity. At 7 days of curing, compressive, flexural and splitting tensile strengths and water permeability ranged between 239~285kgf/$\textrm{cm}^2$, 107~133kgf/$\textrm{cm}^2$, 37~46kgf/$\textrm{cm}^2$ and 4.612~5.913$\ell$/$\textrm{cm}^2$/h, respectively. It is concluded that the blast furnace slag and fly ash can be used in permeable polymer concrete.

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Utilization of waste fine tailing as cement mineral admixture (폐광미 미립분의 시멘트 혼화재로의 활용)

  • An, Yang-Jin;Yu, Seung-Wan;Mun, Kyoung-Ju;Park, Won-Chun;Soh, Yang-Seob
    • Proceedings of the Korea Concrete Institute Conference
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    • 2005.05b
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    • pp.381-384
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    • 2005
  • The purpose of this study reutilization of waste fine tailing (FT) as admixture for cement and concrete. Various admixtures were made of Fine tailings and 2 Types of OPC, fly-ash and blast furnace slag. Cement mortars and concrete with FT are tested for fluidity and compressive strength. Also, the hydration reactivity of cement mortar with FT was examined by XRD and SEM morphology analysis. This work showed that the waste fine tailing could be effectively utilized as replacement materials of cement without any decrease in the strength if we can control the blaine of materials like cement, blast furnace slag and fly ash.

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An Experimental Study on the Salt Damage Resistance of High Durable Concrete (고내구성콘크리트의 염해저항성에 관한 실험적 연구)

  • Yoon, Jai-Hwan;Jaung, Jae-Dong
    • Journal of the Korea Institute of Building Construction
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    • v.3 no.3
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    • pp.73-81
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    • 2003
  • In this paper, salt damage resistance of high durable concrete was tested. High durable concrete was made by using low water cement ratio, chemical admixture called super-durable admixture and mineral admixtures such as fly-ash, ground granulated blast-furnace slag, silica fume. Two kinds of salt damage resistance test were carried out. One method is chloride ion penetration test(ASTM C1202), and the other one is depth of chloride penetration test in saline solution. Test results were as followers: 1) The depth of chloride ion penetration increased exponentially as water cement ratio was increased and time passed. 2) Super-durable admixture had little effect on the improvement of salt damage resistance of concrete. 3) Silica fume and ground granulated blast-furnace slag were effective on salt damage resistance because of pozzolanic reaction, but fly-ash had a little effect.

Estimation of the Strength Development of the Super Retarding Concrete Incorporating Fly Ash and Blast Furnace Slag (플라이애시와 고로슬래그를 조합 사용한 초지연 콘크리트의 강도증진)

  • Han, Min-Cheol
    • Journal of the Korea Institute of Building Construction
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    • v.8 no.5
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    • pp.119-125
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    • 2008
  • In this paper, the estimation of super retarding concrete incorporating mineral admixtures at the same time including fly ash(FA), blast furnace slag(BS) are studied based on maturity method. The setting time was retarded, as super retarding agent contents increase and curing temperature decreases. In addition, apparent activation energy by Arrhenius function was ranged from $24\sim35$ KJ/mol with slightly difference along with mixture proportion. This value is smaller than existing value $30\sim50$ KJ/mol. Based on strength development estimation. it exhibited comparable relativity between prediction value and measurement value. Therefore, this study provided effective strength development prediction value with super retarding agent contents and mineral admixture combination. Strength development prediction equation provided herein is possibly valid for estimating accurate strength development of the super retarding concrete at the job site.

A Study on Production and Physical Properties of High-Strength Concrete with Blending Additives (혼합재를 사용한 고강도 콘크리트의 제조와 물성에 관한 연구)

  • Jeong, Yong;Shim, Yong-Soo;Kim, Won-Ki;Jaung, Jae-Dong
    • Proceedings of the Korea Concrete Institute Conference
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    • 1991.10a
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    • pp.15-20
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    • 1991
  • High-strength concrete were produced with super-plasticizer, silica fume, fly ash and blast furnace slag powder. Topics investigated inclued mix proportion, and effects of unit weight of binder, W/C ratio, additive type on the physical properties of high-strength concrete. As the result, at 20% of silica fume, unit weight of binder 700kg/$\textrm{m}^3$ and W/C=0.24, 28days compressive strength of concrete was over 1,000kgf/$\textrm{cm}^2$. And in cases of blending with silica fume 10% and fly ash or slag 10%, it was able to produce economical high-strength concrete with 28 days strength similar to silica fume 20% only, and higher strength after 90days.

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Utilization of waste fine tailing separated coarse materials as cement mineral admixture (입도분급을 실시한 폐광미 미립분의 시멘트 혼화재로의 활용)

  • An, Yang-Jin;Yu, Seung-Wan;Mun, Kyoung-Ju;Park, Won-Chun;Soh, Yang-Seob
    • Proceedings of the Korea Concrete Institute Conference
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    • 2004.11a
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    • pp.297-300
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    • 2004
  • The purpose of this study reutilization of waste fine tailing as admixture for cement. We observe tailing's basic properties such as shape, physical and chemical basic features. Also, various admixtures were made of 2 Types of tailings, OPC, fly-ash and blast furnace slag. The basic properties of the cement mortars incorporation with these admixtures were examined and analyzed under a verity of experimental conditions. This work showed that the tailing separated coarse materials could be effectively utilized as replacement materials of cement without any decrease in the strength if we can control the blaine of materials like OPC, slag and fly ash.

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Effects of supplementary cementitious materials on drying shrinkage of cement mortar - a comparative study (혼화재에 따른 모르타르 건조수축-비교 연구)

  • Choi, Hoon Jae;Cui, Chengkui;Park, Chung-Hoon;Kim, Baek-Joong;Yi, Chongku;Kang, Kyung-In
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2013.11a
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    • pp.158-159
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    • 2013
  • In this study, effects of supplementary cementitious materials(fly ash, blast furnace slag and waste glass) on drying shrinkage of cement mortar were compared and evaluated. The results showed drying shrinkage of cement mortar using blast furnace slag and waste glass is larger than shrinkage due to capillary pressure, while using fly ash is smaller.

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An Experimental Study on the Change in Chemical Components of Admixture mixed Cement Paste Exposed to Elevated Temperatures (혼화재 혼입 시멘트 페이스트의 고온 수열시 성분 변화에 관한 실험적 연구)

  • Ha, Ji-Yeon;Lee, Han-Seung
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2013.11a
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    • pp.154-155
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    • 2013
  • The aim of this work is to have a better knowledge of reactions that take place in a cement paste, blast furnace slag mixed cement paste and fly ash mixed cement paste and know about the change in chemical components exposed to elevated temperature. The results show that the dehydration reactions appeared differently in the each admixture mixed cement paste and can be used as tracers for determining the temperature history of concrete after a fire exposure.

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