Abstract
One hundred and ninety two thixotropic casting slips were prepared, using bodies of the mixture of grog and kaolinite. The electrolyte was NaOH only or a combination of NaOH and HCl. Combinations of the selected grog mixtures 70% and kaolinite 30% were prepared and the viscosity of slips was determined as well as the casting rate, shrinkage, strength, and pH when the casting slips were first prepared and again after 48-, and 168-hours aging periods.There are no evident relations between pH and viscosity, time of release from mould and viscosity of casting slips, but is a close relation between castability and coefficient of thixotropy.The fired cast bodies from casting slip of low viscosity and high thixotropy which are close packing mixtures of grog and kaolinite, have very high strength, low permeability and porosity.
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