Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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The Fluidity of Cement Pastes with Fly Ashes Containing a Lot of Unburned Carbon

  • Lee, Seung-Heun (Faculty of Materials & Chemical Engineering, Kunsan National University) ;
  • Kawakami, Akira (Department of Metallurgy and Ceramic Science, Graduate School) ;
  • Sakai, Etsuo (Department of Metallurgy and Ceramic Science, Graduate School) ;
  • Daimon, Masaki (Department of Metallurgy and Ceramic Science, Graduate School)
  • Published : 2003.03.01
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Abstract

Fly ashes containing 6.1~16.5 wt% of unburned carbon were treated thermally at 500$^{\circ}C$ for 3 h and thus, the content of unburned carbon was decreased below 2.1 wt%, the range of particle size distribution became narrower and the mean particle size became smaller. Besides, the properties of particles in fly ashes were improved, particularly the particle shape became close to a spherical type. The fluidity of cement pastes containing fly ashes treated previously at 500$^{\circ}C$ for 3 h was increased much than that of cement pastes containing original fly ashes. When the added amount of superplasticizer was over the saturation amount, there was no correlation between the amount of unburned carbon in fly ashes and the apparent viscosity of cement pastes actually. On the contrary, when the added amount of superplasticizer was below the saturation amount, there was a correlation.

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References

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