Abstract
The present paper deals with optimizing different mix variables that affect the rheology of a clay sewer pipe paste. Investigated variables consist of percent water, percent grog and average particle size of clay. Shear stress and strain rates were calculated using an extrusion process through an orifice by means of compressed air. All pastes exhibited Bingham flow behaviour. The effect of percent water, percent grog and clay particle size on the following properties of paste were investigated: Plasticity of extruded paste, dry strength and drying shrinkage. It was found that the optimum parameters to be used are: 27% water (on dry basis), 30% grog mixed with clay of average particle size of 0.2 mm.
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