Rheological Behavior of Coal-Fly-Ash and Clay Slip

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J. Korean Ceram. Soc. > Volume 35(2); 1998 > Article

Journal of the Korean Ceramic Society 1998;35(2): 180.

석탄회-점토계 슬립의 유동학적 거동

이기강, 박천주, 김유택, 김석범, 김정환

경기대학교 공과대학 재료공학과

Rheological Behavior of Coal-Fly-Ash and Clay Slip

ABSTRACT

It was examined that the rheological behaviors of fly ash 70wt%-clay 30wt% slip in which nonplastic fly ash was a major component. We have systematically investigated the effects of deflocculant(Tetrasodium pyrophosphate ; Na4P2O7 nH2O Sodium silicate; Na2SiO3) and coagulant(CaSO4) on the rheological behavior of ash-clay slip. Ash-clay slip have been characterized on the basis of the time dependent rheology which was done out by the gel-curve test. Dispersion mechanism of ash-clay slip is the steric stabilization by the Na2SiO3 coating of cenospheres surface. Coagulated slip seems to have the new network structure and shows the gellation behaviors which makes it possible to direct coagulated casting(DCC).

Key words: Rheological behavior, Fly-ash, Steric stabilization, DCC