Crushed Brick and Tile

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Finely ground clay brick and tile fired at low temperature (c.900°C) is a reactive artificial pozzolan. Pozzolans are not themselves cementitious, but contain constituents that react with lime at ordinary temperatures in the presence of water to form stable hydraulic compounds.

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Usage/Purpose

Finely powdered brick can be added to lime mortars to increase strength and improve long-term durability. Pozzolans react with free lime in mortar and lime efflorescence is therefore less likely. Porosity and permeability are both reduced.

Shelf Life

Indefinite stored in dry conditions

Finish

Fine red/pink powder

Observations

To be mixed, normally as a slurry, with lime mortar immediately before use. Add at 5%, 7.5%, 10% or 15% (by volume to mortar) depending on site exposure and the particular circumstances. Do not remix setting mortar.

Availability

Ex stock. 25kg bags