Table 6: Chemical composition of cement.

Compound Abbreviation % Weight Limits
Calcium oxide CaO 61.48 > 50
Silicon oxide SiO2 25.79 > 25
Aluminium oxide Al2O3 5.60 -
Iron oxide Fe2O3 2.34 -
Sulphur SO3 2.60 ≤ 3.5
Potassium oxide K2O 1.00 -
Phosphorus pentoxide P2O5 0.52 -
Chloride Cl 0.23 -
Titanium Ti 0.21 -
Strontium Sr 0.14 -
Clinker Constituents as Determined by Bogue's Equation
Tricalcium silicate C3S 13.25 -
Dicalcium silicate C2S 63.96 -
Tricalcium aluminate C3A 10.88 -
Tetracalcium aluminoferrite C4AF 7.12
95.21
-
95-100%