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SPECIFICATIONS: OPC 42.5R
THE ORDINARY PORTLAND CEMENT IS NORMALLY SUPPLIED TO MEET THE BRITISH
STANDARDS GB-175-1999 AND U.S. STANDARDS ASTM C-150 SET FORTH BELOW:

1) CHEMICAL COMPOSITION:
a) SILICON DIOXIDE (SIO2) 21.00
b) ALUMINIUM OXIDE (A12O3) 5.30
c) FERRIC OXIDE (FE2O3) 3.30
d) CALCIUM OXIDE (CAO) 65.60
e) MAGNESIUM OXIDE (MGO) 1.10
f) SULPHUR TRIOXIDE (SO3) 2.70
g) LOSS OF IGNITION (LOI) 0.90
h) TRICALCIUM SILICATE (C3S) 60.00
i) DICALCIUM SILICATE (C2S) 15.00
j) TRICALCIUM ALUMINATE (C3A) 8.05
k) TRICALCIUM ALUMINO FERRICE (C4AF) 9.76

2) PHYSICAL AND MECHANICAL PROPERTIES:
a) BLAIN CM2/GR 3.250
b) AUTOCLAVE EXPANTION 0.02
c) INITIAL SETTING TIME (VICAT) 105 MINUTES
d) FINAL SETTING TIME (VICAT) 135 MINUTES
e) COMPRESSIVE STRENGTH @
(1) 03 DAYS 230 KG/CM2;
(2) @ 07 DAYS 305 KG/CM2; and
(3) @ 28 DAYS 420 KG/CM2