With regard to flexural strength (FS), it was found that mixtures
A, B, and C can be used for the production of solid bricks
(FS 20 kgf/cm2
) and mixtures D and F can be used for the production
of roof tiles (FS 30 kgf/cm2
). Statistical tests confirmed
significant differences between the control sludge (I) and mixtures
A, C, D, and F