• Title/Summary/Keyword: Cement clinker

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Properties of the Active Belite Cement with Slag (슬래그를 혼합한 고온형 벨라이트 시멘트의 특성)

  • 안태호;박동철;심광보;최상홀
    • Journal of the Korean Ceramic Society
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    • v.36 no.6
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    • pp.599-603
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    • 1999
  • In an effort to improve the mechanical properties of the belite cement active belite cement clinker was synthesized. Properties of the clinker were characterized by a XRD, FT-IE optical microscopy and SEM. The additive effects of slag on the hydration properties were investigated by the measurement of compressive strength heat evolution and SEM. The experimental results exhibited that the 3wt% borax was effective in stabilizing $\alpha$'-C2S and the addition of 5wt% anhydrite and 40wt% slag wee effective in the hydration.

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Hydration of Supersulphated Slag Cement with $C_4A_3\bar{S}$ type Clinker and Calcined Dolomite as Activator ($C_4A_3\bar{S}$계 클린커 및 하소돌로마이트를 자극제로 한 고환산염 슬라그 시멘트의 수화반응)

  • 박춘근;최상홀
    • Journal of the Korean Ceramic Society
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    • v.22 no.2
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    • pp.33-38
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    • 1985
  • The hydration of supersulphated slag cement which is the mixture of granuloated blast furnace slag anhydrite $C_4A_3$ type clinker and calcined dolomite was studied by X-ray diffraction differential thermal analysis scanning electron microscope observation and measurement of the rate of heat liberation. The main hydrates were ettrigite and C-S-H. This supersulphated slag cement enhanced rapid-hardening and increased in strength at early stage due to the much of ettrigite. Furthermore the hardened cement became stronger due to the C-S-H that was produced from the hydration of the $eta$-$C_2S$ in $C_4A_3$ type clinker and the hydration of the dissolved components from slag at later period.

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solidification/Stabilization of Hazardous Wasted Using Cementitious Material(I) (특수시멘트 고화재를 이용한 지정폐기물의 고형화/안정화(I))

  • Lim, C.Y.;Paik, S.H.;Um, T.S.;Choi, L.;Oh, B.H.;Lee, K.H.
    • Proceedings of the Korea Concrete Institute Conference
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    • 2000.04a
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    • pp.205-210
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    • 2000
  • This study concerns the cement-solidification. stabilization of the electric furnace dust. Compressive strength and leaching test of heavy metals were evaluated for varing types and ratios of cements and the effect of some additives of hauyne clinker and slag were also discussed. In this cases of using cement binders more than 30%, the compressive strength showed the values over 150kgf/cm2. so it can be used as filler for concrete precastings. Type III cement and Hauyne clinker improved the compressive strength, especially early strength. Leaching amount of heavy metals was decreased when using type III cement and adding hauyne clinker and slag. The values were especially low in the case of slag addition.

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Physicochemical properties and autogenous healing performance of ternary blended binders composed of OPC-BFS-CSA clinker

  • H.N. Yoon;Joonho Seo;Naru Kim;H.M. Son;H.K. Lee
    • Advances in concrete construction
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    • v.15 no.1
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    • pp.11-22
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    • 2023
  • Autogenous healing of concrete can be helpful in structural maintenance by healing cracks using a healing material created by the precipitation of calcite and by the hydration of unhydrated binder around the cracks. Against this backdrop, this study investigated the physicochemical properties and autogenous healing performance of ternary blended binder composed of ordinary Portland cement (OPC), blast furnace slag (BFS), and calcium sulfoaluminate (CSA) clinker. Ternary blended binders with various contents of OPC-BFS-CSA clinker were prepared, and their physicochemical properties and autogenous healing performances were examined using various analytical techniques and visually observed using a microscope. The obtained results indicated that increase in the BFS content accompanied the increased the amount of unreacted BFS even after 28 days of curing and had a positive effect on the autogenous healing performance due to its latent hydration. However, replacing the CSA clinker did not increase the autogenous healing performance owing to an insufficient sulfate source for the formation of ettringite. The main precipitates around the cracks were calcite, C-S-H. Other hydration products such as portlandite, monosulfate, and ettringite, which were not found in the Raman and scanning electron microscope analyses.