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 SR NO PARAMETER UNIT RANGE TEST METHOD TEST RESULT A Chemical Parameters 1 Silicon Dioxide SiO 2000 2160 ASTM C1142012 2 Aluminium Oxide AlO 500 640 ASTM C1142012 3 Ferric Oxide FeO 340 450 ASTM C1142012 4 Calcium Oxide CaO 6500 ASTM C1142012 5 Magnesium Oxide MgO 190 ASTM C1142012 6 Sulphur Trioxide SO 155 ASTM C1142012 7 Total Alkali Na2O 065K20 080 ASTM C1142012 8 Chloride Cl 003 ASTM C1142012 9 Loss On Ignition LOI 050 ASTM C1142012 10 Free CaO 180 ASTM C1142012 11 Insoluble Residue IR 050 ASTM C1142012 B Chemical Modules 1 Lime Saturation Factor LSF 9300 Bogue Formula 2 Silica Modulus SM 250 Bogue Formula 3 Alumina Modulus AM 170 Bogue Formula 4 Tri Calcium Silicate CS 55 Bogue Formula 5 Di Calcium Silicate CS 1000 2000 Bogue Formula 6 Tri Calcium Aluminate CA 700 Bogue Formula 7 Tetra Calcium Alumino Ferrite CAF 1000 1400 Bogue Formula Formula for arriving C3S is 4071x CaO Free CaO 760 x SiO2 6718 x Al2O3 143 x Fe2O3