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Components of Cement
Comparison of Chemical and Physical Characteristicsa[1][2]
Property Portland
Cement
Siliceous
(ASTM C618 Class F)
Fly Ash
Calcareous
(ASTM C618 Class C)
Fly Ash
Slag
Cement
Silica
Fume
SiO2 content (%) 21 52 35 35 85–97
Al2O3 content (%) 5 23 18 12
Fe2O3 content (%) 3 11 6 1
CaO content (%) 62 5 21 40 < 1
Specific surfaceb
(m2/kg)
370 420 420 400 15,000–
30,000
Specific gravity 3.15 2.38 2.65 2.94 2.22
General use
in concrete
Primary
binder
Cement
replacement
Cement
replacement
Cement
replacement
Property
enhancer
aValues shown are approximate: those of a specific material may vary.
bSpecific surface measurements for silica fume by nitrogen adsorption (BET) method,
others by air permeability method (Blaine).
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