Table 1: Chemical composition and properties of Ordinary Portland Cement and Fly Ash.

Chemical Composition (%) Ordinary Portland Cement Fly Ash
SiO2 12.1 36.4
Al2O3 1.93 14.1
Fe2O3 4.18 22.4
CaO 75.9 17.5
MgO 1.03 2.55
Na2O - 0.231
K2O 0.486 2.09
SO3 3.44 1.04
SiO2 + Al2O3 + Fe2O3 18.21 72.9
Specific Gravity 3.0883 2.7767
Loss of ignition 1.1 1.49

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