Pozzolans
Durability Guaranteed - Pulhamite Rockwork - Its conservation and repair, published by Historic England in 2008, defines pozzolans as: ‘Materials consisting of silica and alumina which react with calcium hydroxide in the presence of moisture to produce a hydraulic set, with properties like hydraulic lime. Pozzolans are derived from natural sources such as volcanic earth or from manufactured ones such as low-fired clay products.’
Low Carbon Concrete Routemap, Setting the agenda for a path to net zero, draft for consultation published by the Institution of Civil Engineers in 2021, defines pozzolan as: ‘A siliceous and aluminous material that, in the presence of moisture, chemically reacts with calcium hydroxide to form compounds possessing cementitious properties; such as calcined (kaolinate) clays, fly ash, volcanic ash and silica fume.’
Hot-mixed Lime Mortar, published by Historic Environment Scotland in April 2015 states: ‘Pozzolans are natural or man-made materials including brick dust and pulverised fuel ash (PFA), or proprietary additives, which are added in small, measured, quantities to lime mortars, just before use, to impart hydraulic properties.’
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