Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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Early Hydration Properties of Calcium Aluminosulfate (3CaO · 3Al2O3 · CaSO4) Prepared by Chemical Synthesis

  • Kim, Hoon-Sang (Department of Materials Science and Engineering, Dankook University) ;
  • Kim, Hyung-Chul (Department of Materials Science and Engineering, Dankook University) ;
  • Song, Jong-Taek (Department of Materials Science and Engineering, Dankook University)
  • Published : 2002.07.01
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Abstract

Calcium aluminosulfate (3CaO.3Al$_2$O$_3$.CaSO$_4$or $C_4$A$_3$S) was prepared by chemical synthesis from the nitrate salts and aluminum sulfate. $C_4$A$_3$S was the main phase after calcination at 110$0^{\circ}C$. The specific surface areas after calcination at 110$0^{\circ}C$ and 130$0^{\circ}C$ were about 2.5 and 1.0 $m^2$/g, respectively. Hydration was investigated by XRD, DSC, SEM, EDS, conduction calorimetry and analysis of the liquid phase. Calorimetry showed that the induction period was longer than that of a sample prepared by conventional solid state sintering and this was attributed to the formation of amorphous coatings in abundance of $Al_2$O$_3$ and SO$_3$. Crystalline hydration products, principally calcium monosulfoaluminate hydrate and Al(OH)$_3$, appeared subsequently.

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References

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