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Hydraulic/Non-Hydraulic lime (Water/Air limes)

- a hydraulic lime produces a mortar with setting properties assisted by the presence of water; hence, hydraulic limes are sometimes referred to as "water limes". This set is caused by clay substances present within the original lime source, in effect a naturally occurring additive. Non-hydraulic limes are a purer substances which can only achieve a set through carbonation, and are therefor sometimes referred to as "air limes".