Studies on the Rheological Behaviour of Aqueous Suspensions of Pre-Fired Terracotta Compositions in Relation to Newtonian Factor n

Utilization of common clay in admixtures with quartz and fly ash for fabrication of utility goods and art object is widely in practice. However, slip casting of slurries poses several problems in shaping of green bodies. In the present investigation, Newtonianity of the suspensions were evaluated and an attempt has been made to correlate Newtonian factor ʹnʹ with the castability of a slip. Different factors affecting ʹnʹ are analysed by rheological investigation of the suspensions. It was found that the suspensions were pseudoplastic in nature with a marked tendency towards Newtonian. The castability of the suspensions were explained in terms of Newtonianity (ʹnʹ values) of the suspensions. The results were utilized for further fabrication of green articles by slip casting.