Addition of 2.5% residue (B series) to clay body caused 18% decrease in bulk density. However, additional residue (From B series to C series) reduced the bulk density of clay body only 4%. According to these observations, 2.5–5% pulp residue additions to clay body seem to be optimal addition ratio. Because, 10% addition caused only 2.1% bulk density decrease as
compared to C series sample. Similar to apparent porosity, water absorption values were also increased with increase in residue addition amount.