Portland cement clinker is a dark grey nodular material made by heating ground limestone and clay at a temperature of about 1400 °C - 1500 °C. The nodules are ground up to a fine powder to produce cement, with a small amount of gypsum added to control the setting properties.
Nodules range in size from 1mm to 25mm or more and are composed mainly of calcium silicates, typically 70%-80%. The strength of concrete is mainly due to the reaction of these calcium silicates with water.
Portland cement clinker contains four principal minerals:
- Alite: approximately tricalcium silicate (typically about 65% of the total)
- Belite: approximately dicalcium silicate (typically about 15% of the total)
- Aluminate: very approximately tricalcium aluminate (typically about 7% of the total)
- Ferrite: very approximately tetracalcium aluminoferrite (typically about 8% of the total)
The balance is made up of alkali sulfates and minor impurities.
In cement chemistry, chemical analyses are normally given in oxide form - a typical example of an analysis follows for Clinker Composition:
Typical clinker analysis (oxide weight%).
Free lime = 1.0% CaO
Balance is typically due to small amounts of oxides of titanium, manganese, phosphorus and chromium.
Datis Inc. is one of the world’s leading quality driven exporters of cement Clinker.
We may customized any type of Portland Cement Clinker based on your inquiry.
You can see the last Clinker Specification that we supplied for a client in ME: