Table 4 Chemical and physical properties of silica fume.

From: A step towards sustainable glass fiber reinforced concrete utilizing silica fume and waste coconut shell aggregate

Chemical property

Percentage (%)

Physical property

Results

SiO2

87.6

Particle size (average)

 ≤ 0.2 µm

CaO

2.9

Specific gravity

2.3

Al2O3

5.7

Color

Light grey

Fe2O3

1.7

Bulk density (kg/m3)

570

MgO

2.5

Solubility

Insoluble

SO3

1.9

Specific surface area

22 m2/g

K2O

2.4

  

Na2O

0.2

  
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