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Table 1 Chemical composition of OPC and silica fume used.

From: Effect of Morphology and Dispersibility of Silica Nanoparticles on the Mechanical Behaviour of Cement Mortar

Parameters

OPC

Silica fume

SiO2 (%)

22.1

96.03

Al2O3 (%)

6.8

0.43

Fe2O3 (%)

2.2

0.99

CaO (%)

61.6

0.25

MgO (%)

3.4

0.63

SO3 (%)

2.4

0.30

Na2O (%)

0.12

0.40

K2O (%)

0.7

0.63

Average diameter (nm)

0.1–10 µm

Specific gravity

3.15

2.23

Specific surface area (m2/g)

29

LOI

0.5

1.98