11 Jan,2016 UTC+8 Views:
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.
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)
Clinker Composition:
In cement chemistry, chemical analyses are normally given in oxide form - a typical example of an analysis follows:
|
Typical clinker analysis (oxide weight %). |
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|
SiO2 |
Al2O3 |
Fe2O3 |
CaO |
MgO |
K2O |
Na2O |
SO3 |
LOI |
IR |
Total |
|
21.5 |
5.2 |
2.8 |
66.6 |
1.0 |
0.6 |
0.2 |
1.0 |
1.5 |
0.5 |
98.9 |
|
Free lime = 1.0% CaO Balance is typically due to small amounts of oxides of titanium, manganese, phosphorus and chromium. |
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