Limestone is calcareous sedimentary rocks formed at the bottom of lakes and seas with the accumulation of shells, bones and other calcium rich goods. It is composed of Calcium Carbonate. The organic matter upon which it settles in lakes or seas, are preserved as fossils. Over thousands and millions of years, layer after layer is built up adding weight. The heat and pressure causes chemical reaction at the bottom and the sediments turn into solid stone, the limestone.
Physical Properties :
Hardness: 3 to 4 on Moh's Scale
Density: 2.5 to 2.7 Kg/cm3
Compressive Strength: 60-170 N/mm2
Water Absorption: Less than 1%
Porosity: Quite low
Weather Impact: Resistant
Chemical Composition :
Lime (CaO) : 38-42%
Silica (SiO2) : 15-18%
Alumina (Al2O3) : 3-5%
MgO: 0.5 to 3%
FeO + Fe2O3: 1-1.5%
Alkalies: 1-1.5%
Loss On Ignition (LOI) : 30-32%
Uses
Used as aggregate or base for roads and foundations.
Used in the purification of molten glass.
Used to remove impurities from molten iron.
Used as filler and abrasive in toothpastes.
Used in the production of Portland cement.
Used as an aggregate in concrete.
Used as a soil conditioner for neutralizing acidic soils.
Used as a source of calcium in supplements and food additives.
