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Table 1 Chemical composition of Portland cements and fly ashes.

From: Improvement of High-Volume Fly Ash Cementitious Material Using Single Alkali Activation

Chemical composition (%)

Portland cement Type I

Fly ash

Silicon dioxide, SiO2

20.10

35.20

Aluminum oxide, Al2O3

5.20

19.20

Iron oxide, Fe2O3

3.15

17.81

Calcium oxide, CaO

60.24

16.65

Magnesium oxide, MgO

1.13

Sodium oxide, Na2O

0.11

0.63

Potassium oxide, K2O

0.43

2.44

Sulfur trioxide, SO3

2.42

1.50

LOI

2.03

0.15