Chemical composition

Dangote OPC by mass,% [22]

Reppie IMSW fly ash by mass, %

OPC cement

as per ES, 2005

SiO₂

22.82

30.72

18-24

Al₂O₃

14.96

2.6-8.0

Fe₂O₃

3.37

3.90

1.5-7.0

CaO

66.32

22.54

61-69

MgO

1.46

2.82

0.5-4.0

Na₂O

-

3.62

-

K₂O

-

8.16

0.2-1.0

MnO

-

0.26

-

P₂O₅

-

2.11

-

SO₃

2.16

-

0.2-4.0

TiO₂

-

0.04

-