Pulverised Fuel Ash
Pulverised Fuel Ash is a pozzolanic additive, extracted from spent fuel hoppers of coal fired boilers and ground to a fine powder. Pozzolans are materials that are not themselves cementitious, but contain constituents which react with lime at ordinary temperatures in the presence of water to form stable hydraulic compounds.
Conforms to BS EN 450. Grade N.
PFA is used in pozzolanic grouts and to increase strength and improve long-term durability of lime mortars.
Indefinite stored in dry conditions.
Fine grey powder. (Batch colour varies slightly)
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.
Ex.Stock. Indefinite stored in dry conditions. 20kg bags.