the ultimate strength at the optimal sintering temperature
was 63 MPa. It is interesting to note that the value of
ultimate strength for all compositions made with chamotte
addition was higher than those of composition 3 KV (with
10 wt.% alumina platelets and 10 wt.% waste glass addition)
developed in the previous work [1], where the ultimate
strengths reached only 54 MPa. However the highest
ultimate strengths value of samples sintered with chamotte
incorporation (72 MPa in composition 3S2 with 20 wt.%
chamotte) is approximately 20% lower than the most
successful composition produced using the same wt.% of
commercial Al2O3 platelets described in the previous paper
[1]. This indicates the need to rely on commercial
reinforcing elements (alumina platelets, SiC particles) if
the mechanical strength of glass-ceramic matrices must be
optimised to a very high value a (100 MPa). Nevertheless,
the composite materials produced in the present study, which
are totally made of residues, exhibit in all cases comparable
mechanical strength values, to those of the equivalent wasteonly
glass composites produced by Ferraris et al.