Ash Benefits & Uses

South Africa only produces siliceous (pozzolanic) fly ash
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WHAT ASH IS AVAILABLE?

  • Fly ash
  • Classified fly ash
  • Un-classified fly ash
  • Clinker ash (old chain grate boilers)
  • Cenospheres (limited availability)
  • Bottom ash
  • Disposed ash

South Africa produces in excess of 50 million tons of ash per annum with about a 10 % utilisation.

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WHAT ARE ITS BENEFITS?

In Concrete

  • Increased post 28 day strength gain
  • Reduced the rate of chloride diffusion through the concrete
  • Prevents or retards alkali-silica reaction
  • Reduced heat of hydration by up to 20 %
  • Reduction of shrinking due to lower water demand
  • Increase in overall durability of the concrete
  • Improves sulphate resistance
  • Improves the workability of fresh concrete
  • Reduction in bleed water

Environmental

  • Reduction of CO² emission
  • Reduces disposal volumes and neutralises waste
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WHAT ARE ITS USES?

Typical uses of ash include:

  • Cements and grouts
  • Concrete Products & Bricks
  • Ready mix concrete
  • Artificial aggregates
  • Road construction & soil stabilisation
  • Soil conditioning
  • Mine rehabilitation
  • Agriculture

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