Quicklime (Calcium oxide CaO) is hydrated or slaked to produce lime putty, lime-wash and hydrated lime. There is also renewed interest in the hot-mix mortar method where quicklime and sand or aggregate are mixed with water and either used immediately whilst hot or cooled and stored before use. Hot-mix method mortars set by reaction with atmospheric carbon dioxide in the presence of moisture.
Unconverted limestone or chalk and small quantities of insoluble flint and/or quartz are also often present in quicklime.
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