Portland cement clinker is a dark grey nodular material made by heating ground limestone and clay at a temperature of about 1350 C-1500 C. These materials are extracted from Nature and fortunately all of our plants have supplies to last over
200 years. After extractions, the nodules are ground up to a fine powder to produce cement, with a small amount of gypsum added to control the setting properties.
These settings are crucial to guarantee a high quality product that meets International standards.
Clinker nodules range in size and are composed mainly of calcium silicates, typically 75%-80%. The strength of concrete is mainly due to the reaction of these calcium silicates with water.
Clinker contains four main minerals:
Alite: approximately tricalcium silicate (typically about 65% of the clinker)
To see more about our clinker specification feel free click on the files listed and you will be able to view the composition of our product according to the GB standard.
Belite: approximately dicalcium silicate (typically about 15% of the clinker)
Aluminate: very approximately tricalcium aluminate (typically about 7% of the clinker)
Ferrite: very approximately tetracalcium aluminoferrite (typically about 8% of the clinker).
The balance is made up of alkali sulfates and minor impurities. The typical mineral contents are subject to wide variation.