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Cement Replacing Materials

Summary

Materials which can slightly alter and improve the properties of concrete. Most cement replacing materials are categorised as pozzolans.

Technical Information

Using cement replacing materials in concrete can alter the following properties of concrete:
  • Early strength
  • Ultimate Strength
  • Workability
  • Sulphate resistance
  • Heat of hydration

Chloride diffusivity Some examples of cement replacing materials are:

  • Pulverised fuel ash (PFA)
  • Ground granulated blast furnace slag (GGBFS)
  • Silica fume (SF)
  • Metakaolin
  • Limestone fines 

As a lot of cement replacing materials are by-products of other industries; they can be cheaper and more environmentally friendly to use than 100% Portland cement.  Overall proportioning must be checked to ensure that there are no unintended adverse side effects from additional cementitious materials.

Resources

  1. Portland Cement Association. "Chapter 3 Fly Ash,Slag,Silica Fume,and Natural Pozzolans" 

  2. http://maxwellsci.com/print/rjaset/v4-3746-3754.pdf 

  3. The Concrete Society – Technical Report No. 74 – Cementitious Materials

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