Crushed fired brick waste, known as grog, screened at two different particle size,
840 (20 mesh) and 420 μm (80 mesh), was used in mixtures with clayey body to make typical
red ceramics for bricks. The effect of the grog addition up to 20 wt.% on the properties and
microstructure of bricks fired at 700oC was evaluated. The results indicated that both the
particle size and the amount of grog addition changed the fired properties of the clayey body.
Additions above 5 wt.% of grog, with a coarser particle size, decreased the mechanical
strength of both the dry body and the fired ceramic pieces. By contrast, grog with a finer
particle size may be used up to 10% wt. without deteriorate the properties and corresponding
microstructure of the clayey body.