Lime is a building material known since antiquity. It is a binder obtained by high temperature calcination of natural limestone, a sedimentary rock composed almost exclusively of calcium carbonate.
Processing of limestone.
The limestone mineral, found in the form of calcium carbonate (CaCO₃), is subjected to a cooking process in special furnaces at a temperature of about 1000 ° C. In this phase, a chemical reaction occurs, called calcination, which leads to the liberation of carbon dioxide and calcium oxide production. The calcium oxide commonly referred to as “lime” is very hygroscopic and with a pH level so high that in order to be used so it must undergo a process of hydration with water to obtain hydrated lime or calcium hydroxide.
The carbonation process.
The process begins with the removal of excess water and its subsequent drying. In fact, the calcium hydroxide is dispersed in water and in contact with carbon dioxide, which is also dissolved in the water, forms calcium carbonate. Calcium carbonate is solid and insoluble in water.
Air Lime and Hydraulic Lime.
Based on the ability to complete the hardening process in contact with air, or in areas not in contact with air, for example in water; we have the Air Lime in the first case and Hydraulic Lime in the second case.
LAGES lime based plasters.
Thanks to their characteristics, in particular the water-insolubility, lime-based plasters have made the Italian building history. For this reason the lime-based plasters are used in renovation of historic buildings and in new developments in green building.
LAGES has a long and distinguished tradition in the production of plaster based Hydraulic Lime
and Natural Hydraulic Lime. These LAGES Plasters have decorated the facades of many beautiful and prestigious Italian palaces.