Syllabus • Lime – Preparation of lime mortar • Cement – Ingredients – Manufacturing process – Types and Grades – Properties of cement • Cement mortar – Hydration – Compressive strength – Tensile strength – Fineness– Soundness and consistency – Setting time • Industrial byproducts – Fly ash – Aggregates – Natural stone aggregates – Crushing strength – Impact strength – Flakiness Index – Elongation Index – Abrasion Resistance – Grading – Sand Bulking.
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.