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 Microsilica

Microsilica is highly reactive pozzolanic material produced during the manufacture of Ferrosilicon and Silicon Metal Alloys.

It is formed by the condensation of vapour given off during the smelting of coal, quartz, iron ore and other ingredients in an electric arc furnace at around 2000°C.

Microsilica powder is composed of ultra-fine solid spherical particles of amorphous silica each approximately 100 times smaller than a cement grain.

Microsilica 93 Conforms to Euro Standard EN:13263-1 Densified Concrete / Refractory Grade Material Safety Data Sheet
Microsilica 88 Conforms to Euro Standard EN:13263-1 Undensified Concrete Grade Material Safety Data Sheet
Microsilica 96DD Conforms to ASTM C1240. Densified refractory grade Material Safety Data Sheet
Microsilica 96UD Conforms to ASTM C1240. Undensified refractory grade Material Safety Data Sheet
M600 White Undensified Concrete Grade Material Safety Data Sheet

Typical Physical Composition:

  OPC Microsilica GGBFS PFA
Surface area
g/m2
360 - 500 19,000-23,000 300 - 500 300 - 600
Specific Gravity 3.12 2.10 2.90 2.30
Bulk density kg/m3 1,300 - 1,400 300 - 650 1,000 - 1,200 1,000

Markets / Applications

Concrete / Cementitious

Microsilica will:

  • - Reduce segregation and bleeding in fresh concrete
  • - Increase comprehensive, tensile and flexural strength throughout the
      curing cycle
  • - Replace up to 35% OPC in a mix
  • - Greatly reduce the ingress of water-borne deleterious chemicals
  • - Reduce the penetration of gases and so reduce carbonation
  • - Improve resistance to freeze/thaw cycles
  • - Increase abrasion resistance
  • - Minimise the risk of alkali/silica reaction
  • - Increase workability for equivalent slump
  • - Greatly decrease rebound during application of shotcrete

Refractory

High Temperature: Microsilica reacts with alumina forming mullite which gives a castable high strength at up to 1700°C
Heat Up: Improved green strength
Flow: Reduced water demand when casting
Dense Castables: Void filling for density for lower permeability, higher strength and higher thermal conductivity

Other

  • - Casting
  • - Insulation
  • - Non cementitious building products
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