- Lime Plaster: Creates a hydraulic lime from hydrated lime without altering the colour. Makes the plaster denser and less permeable compared to hydrated lime, but sets quicker. It is most commonly used for exterior lime plaster where strength and durability are more important than vapour permeability. Use at 10-50% replacement of lime.
- Concrete: It makes the concrete denser, stronger, less permeable, more resistant to chemical attack and less susceptible to freeze-thaw cycles. Use 15-20% replacement of cement in concrete.
- It may have a pozzolanic reaction with clay and could be used in the same way that it is for lime plaster.
It is mainly amorphous silica (and doesn’t contain any crystalline silica) and therefore much healthier to work with. Using a respirator is still recommended.