Use of ash for the production of bricks

Summary

The use of fly ash, obtained from a heat regeneration plant  (Hera SpA, Ravenna) running on waste-derived-fuel (WDF) for electricity production, in an industrial body for brick production was studied. The plant produces about 5000 tons of ash, which is disposed of under current regulations.  The  ash and brick body supplied by a brickworks were characterised by chemical and mineralogical analyses, granulometry, thermal analysis, and dilatometry.  The ash was added to the body in amounts of 1.0, 1.7 and 3.0 wt%.  The technological characteristics of bodies were assessed under simulated industrial conditions.  The plasticity, shrinkage, flexural strength, and water absorption were determined.  Chemical and mineralogical compositions of fired bodies, as well as efflorescence and soluble salt content, were determined.  The results showed good compatibility between the ash and the body, and 1-1.7% ash addition had little effect on unfired and fired body properties.  A firing temperature of 875 C is the most suitable.  Problems with polluting emissions (particularly chlorine) need to be addressed, however.  12 refs.

Primary author(s): Agostini L; Marsigli M

                            Agenzia Polo Ceramico

Source: Ind.Laterizi

            14,No.79,2003,p.21-36

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