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.’
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