Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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Effect of Silicate Ions on the Hydration of 4CaO · Al2O3 · Fe2O3 with Gypsum

  • You, Kwang-Suk (Minerals and Materials Processing Division, Korea Institute of Geoscience and Mineral Resources) ;
  • Ahn, Ji-Whan (Minerals and Materials Processing Division, Korea Institute of Geoscience and Mineral Resources) ;
  • Kim, Hwan (Material Science and Engineering, Seoul National University) ;
  • Goto, Seishi (Graduate School of Medicine, Medical Engineering and Science, Yamaguchi University)
  • Published : 2004.09.01
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Abstract

Na$_2$Si$_2$O$_{5}$ added to the solution affects the hydration of 4CaOㆍAl$_2$O$_3$ㆍFe$_2$O$_3$ with calcium sulfate. The reaction between 4CaOㆍAl$_2$O$_3$ Fe$_2$O$_3$and CaSO$_4$ㆍ 2$H_2O$ decrease with increasing amount of Na$_2$Si$_2$O$_{5}$ in solution, owing to low hydraulic reactivity of 4CaOㆍAl$_2$O$_3$ㆍFe$_2$O$_3$by the adsorption of silicate ions on the surface of 4CaOㆍAl$_2$O$_3$ㆍ Fe$_2$O$_3$ particles. The dissolution rate of 4CaOㆍAl$_2$O$_3$ㆍ Fe$_2$O$_3$ particles deceased with the increase of the concentration of silicate ion in solution. When the 4CaOㆍAl$_2$O$_3$ㆍFe$_2$O$_3$ particles was hydrated in gypsum - Na$_2$Si$_2$O$_{5}$ solution, the hydration was retarded and the rate could not discriminate between formation of ettringite and that of monosulfate, and it stopped in high concentration of silicate ions. However, silicate ion did not any effect on the dissolution rate of gypsum.ypsum.

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References

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