Effects of glass waste addition on technological properties of porcelain stoneware tiles (Comunicazione a convegno)

Type
Label
  • Effects of glass waste addition on technological properties of porcelain stoneware tiles (Comunicazione a convegno) (literal)
Anno
  • 2001-01-01T00:00:00+01:00 (literal)
Alternative label
  • Matteucci F., Dondi M., Guarini G. (2001)
    Effects of glass waste addition on technological properties of porcelain stoneware tiles
    in 7th Conference of the European Ceramic Society, Bruges (Belgium), 9-13 September 2001
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Matteucci F., Dondi M., Guarini G. (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • CNR ISTEC (literal)
Titolo
  • Effects of glass waste addition on technological properties of porcelain stoneware tiles (literal)
Abstract
  • The aim of this research is to assess the effects of the addition of waste glass on both technological behaviour and technical properties of porcelain stoneware bodies. Several bodies were designed adding up to 10% waste (float and container glass) to a typical industrial formulation in replacement of sodium feldspar. Tiles were prepared at a laboratory scale through wet grinding, dry pressing and fast firing at various maximum temperatures (1100°C-1200°C). Fired and unfired samples were characterized measuring: pressing expansion, drying and firing shrinkage, green, dry and fired bending strength, open and closed porosity, water absorption and bulk density. Furthermore phase and chemical composition of stoneware was determined and viscosity plus surface tension of glassy phase was estimated. As far as the technological properties of unfired samples are concerned, no significant differences were found among the various bodies. Firing behaviour is clearly affected by the introduction of waste; waste glass-bearing sample exhibit lower water absorption and a higher shrinkage, sintering more quickly than waste free porcelain stoneware up to 1160°C. For higher temperatures the presence of waste promoted the development of a higher closed porosity and a worsening of mechanical properties (from 50-55 MPa to 40-45 MPa). Phase composition showed a diminishing trend for quartz and plagioclase with increasing temperature that is faster in bodies without waste. The higher the temperature, the more glassy phase is formed, but only slightly more abundant is the waste-bearing product. In conclusion the presence of waste glass enhanced the sintering kinetic, lowering the temperature of 20-30°C but the final products have worse performances in terms of bending strength while all the other technological parameters are scarcely influenced showing variations tolerable in the industrial practice. (literal)
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