What Is Lime?
Limestone is a sedimentary mineral which is largely composed of the calcite (calcium carbonate). When limestone is burnt at a high tempature produces quick lime, a calcium oxide. When water is mixed with the lime, slaked lime is created (calcium hydroxide). Slaked lime was mainly produced as lime putty for building industry using lime kilns. Lime putty is very malleable when first mixed, but after a while it absorbs carbon dioxide from the atmosphere and strengthens the lime, as it reverts back to calcium limestone.
Lime in simple terms, is calcium combined inorganic materials; where carbonates, oxides and hydroxides are the main contributing elements. In layman terms Calcium oxide or calcium hydroxide. It can also be a single mineral (Native lime) of the CaO composition.
Lime mortar is made in a three stage process, which can be seen below.