• Title/Summary/Keyword: Cement clinker

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Quantitative Analysis of Rietveld Method Minerals by Sintering Temperature of Cement Clinkers with Fly Ash (리트벨트법에 의한 석탄재를 적용한 시멘트 클링커의 소성 온도별 광물 정량분석)

  • Yoo, Dong-Woo;Im, Young-Jin;Park, Tae-Gyun;Lee, Chang-Hyun
    • Journal of the Korean Recycled Construction Resources Institute
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    • v.8 no.4
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    • pp.514-519
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    • 2020
  • In this study, cement clinkers were sintered at each temperature by replacing some of the clay components of cement clinkers with coal materials. The mineral phase change of sintered cement clinker was quantitatively analyzed by XRD-Rietveld method. As the sintering temperature of cement clinker increased, the amount of belite decreased, the amount of alite increased, and the amount of free-CaO decreased. The form of alite and belite could be distinguished at sintering temperature of 1450℃ or higher. The crystal size was greatly increased at 1500℃ sintering. It was confirmed that the excessive sintering was progressed. Free-CaO decreased with the increase of sintering temperature. At 1450 ℃ or higher, it was less than 0.5%. In 1450℃ or greater, it is determined that enough sintering is included. Therefore, the application of fly ash as a raw material of cement clinker was judged to be usable as a source of chemical components of alumina and iron raw materials.

Physical Properties of Concrete using Industrial By-Products as Binder (산업부산물을 결합재로 이용한 콘크리트의 물리적 특성)

  • 강내민;문경주;소양섭
    • Proceedings of the Korea Concrete Institute Conference
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    • 2003.05a
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    • pp.79-82
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    • 2003
  • In this study, non-sintering cement is produced by only blending granulate blast furnace slag with phosphogypsum as main materials, and small amounts of hydrate lime or waste lime as activators. This paper was investigated physical properties of fresh concrete and hardened concrete using non-clinker cement according to various mixing ratio. Results obtained from this study have shown that concrete using non-clinker cement could be used for structural concrete and concrete 2th production as binder.

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The Effects of Borax on Formation of Modified Belite Cement Minerals (Modified Belite Cement 구성광물의 생성에 미치는 붕상의 영향)

  • 채우형;최상홀
    • Journal of the Korean Ceramic Society
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    • v.33 no.10
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    • pp.1163-1169
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    • 1996
  • The effects of borax on the phase formation of C2S, C4A3 and $\alpha$'-C2S phases. It has negative effects on formation of C4A3 And it lowers the forming temperature of C4AF. It also has been found that borax improves the clinkerization of MBC. In the MBC clinker with borax 3% C2S have larger and more irregular shapes, larger C/S mole ratio and C4A3 have smaller size larger C/ molr ratio than in the clinker without borax.

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Effect of Chlorine Content in Clinker on Setting and Compressive Strength of Early Strength Cement (클링커 염소 함량이 조강형 시멘트의 응결 및 압축강도에 미치는 영향)

  • Jae-Won Choi;Byoung-Know You;Dong-Kyun Seo;Kyoung-Seok Kim;Min-Cheol Han
    • Journal of the Korean Recycled Construction Resources Institute
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    • v.11 no.3
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    • pp.218-225
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    • 2023
  • In this study, we examine the feasibility of using chlorine in clinker as an early-strength cement by the effect of accelerating the cement hydration reaction of chlorine. Clinker with a chlorine content of 200-1,000 ppm was prepared using actual cement kilns, and 46 cement samples were prepared by adding gypsum and admixtures(GGBFs and limestone). We measured consistency, setting, 1-28 days compressive strength and analyzed them statistically. Test results indicated that an increase of the chlorine content resulted in shortening of initial and final setting time and the improvement of 1 day compressive strength. But the 28 days compressive strength was decreased. Specifically, when the chlorine content was increased from 230 to 965 ppm, the 1 day compressive strength increased up to 4.6 MPa, improvement effect was superior to that of increasing Blaine in the range of 3,400-3,970 cm2/g.

A Study on the Making of Slag Cement Clinker from Reduced and Modified Converter Slag (개질전로슬래그를 활용한 슬래그 시멘트 클링커 소성에 관한 연구)

  • Park Sun-Ku;Kim Young-Whan;Ko In-Yong
    • Resources Recycling
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    • v.11 no.6
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    • pp.24-30
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    • 2002
  • Reduced and modified converter slag was ball milled and sieved to -200/+325 mesh. CaO,$SiO_2$, $Fe_2$$O_3$ was added to slag powder and mixed to make it similar to the composition of normal portlant cement. The pellet made of this powder was heated from $1250^{\circ}C$ to $1450^{\circ}C$ for 15 min~45 min. Most feasible condition for making slag cement clinker is the heating more than 20 min at $1450^{\circ}C$. The compressive strength of the mortar made of this slag cement clinker was better than that of normal port-lant cement in long time curing.

Mineral Composition and Color Properties of Molten Clinker made from Blast Furnace Slag (고로(高爐)슬래그로 부터 제조(製造)된 용융(溶融)클링커의 광물조성(鑛物組成)과 색도특성(色度特性))

  • Chu, Yong-Sik;Seo, Sung-Kwan;Im, Du-Hyuk;Song, Hun;Lee, Jong-Kyu;Lee, Seung-Ho
    • Resources Recycling
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    • v.20 no.6
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    • pp.71-77
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    • 2011
  • Raw mix of molten clinker was fabricated using blast furnace slag as starting material. Raw mix was melted at 1620 for molten clinker fabrication. Color and mineral composition of molten clinker was investigated by XRD and colorimeter. It was found that the molten clinker contains alite and belite equivalent to OPC clinker mineral and shows higher whiteness value than that of OPC. Whiteness of the molten clinker decreased with LSF and SM. Also the whiteness value of the slag cement using molten clinker was higher than that of common slag cement.