Pozzolans
Pozzolan (a powdered additive made from burnt clay) is used to achieve a hydraulic set in traditional hot lime mortars and plasters.
Argical-M 1000
Argical-M 1000 Pozzolan is helpful when applying hot lime mixes in damp, frost prone or exposed locations. The addition of Argical to hot lime mixes will increase compressive strength which helps to offer additional protection during the carbonation period.
Traditionally, volcanic ash, brick dust and other forms of burnt clays were used as additives in hot lime mixes and today this is refined in the form of Argical-M 1000. The term ‘pozzolan’ originates from the Italian town of Pozzuoli where volcanic ash was added during Roman times.
We recommend adding a pozzolan between 5% – 10% by volume depending on the time of year, exposure and use.
Quantity required for gauging into pre-mixed mortars:
- 5% by volume (1/20) – One tonne of mortar requires 12.5kg of Argical-M 1000
- 10% by volume (1/10) – One tonne of mortar requires 25kg of Argical-M 1000
Quantity required when making hot mix mortars on site:
- 5% by volume – For every measure of Quicklime added to the mix, add approx 20% of the same measure of Argical-M 1000
- 10% by volume – For every measure of Quicklime added to the mix, add approx 40% of the same measure of Argical-M 1000
Available in either 25kg bags or 2 litres for smaller tubs of mortar.
Terracotta brick dust is also available as an alternative in 20kg bags.
