Lime • Lime is one of the basic building material used mainly as lime mortar in construction. • Properties of building lime, advantages, and uses in construction is discussed. • The broad category of lime is non-hydraulic and hydraulic lime. • The non-hydraulic lime is called as quick lime, fat lime or white lime or as lump lime. • Hydraulic lime sets under water and nonhydraulic lime do not set under water.
• Quick Lime is a form of lime is manufactured by the burning of stone that has calcium carbonate within it. • The burning temperature varies, say 900 degree Celsius and above for several hours. This process is called as calcination. • The solid product that remain after the removal of carbon dioxide in the calcium carbonate is called as the quicklime.
• The quick lime is used as hydrated lime (quick lime with water). • This is because it is unstable and hazardous in nature. • There is heat liberated when a small quantity of water is added to the quicklime. CaCO3 (Calcium carbonate) –> CaO (Calcium Oxide – Quick Lime) + CO2 • After this hydration product, a fine dry white powder is obtained, which is called as calcium hydroxide or slake lime. Now this process is defined as the slaking of lime.
• The slaking of lime is a process that varies depending upon the extent and type of use. For example, the use of lime in plasters or in mortars, make use of lime in dry or putty form.