Hydraulic lime
Durability Guaranteed - Pulhamite Rockwork - Its conservation and repair, published by Historic England in 2008, defines hydraulic lime as: ‘A form of lime which will set and harden under water, primarily through chemical reaction with the water (in contrast to non-hydraulic limes, which harden by reaction with carbon dioxide in the air; see Non-hydraulic lime). Hydraulic limes contain varying amounts of calcium silicates, calcium aluminates and calcium hydroxide, produced either by the burning of clay-rich (argillaceous) limestones or by the addition of various hydraulic materials.’
See also: Non-hydraulic lime.
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