| Ordinary Portland Cement |
Ordinary Portland Cement
As defined by the European Standard EN197.1, "Portland cement clinker is a hydraulic material
which shall consist of at least two-thirds by mass of calcium silicates (3CaO.SiO2 and 2CaO.SiO2),
the remainder consisting of aluminium- and iron-containing clinker phases and other compounds.
The ratio of CaO to SiO2 shall not be less than 2.0. The magnesium content (MgO) shall not
exceed 5.0% by mass." (The last two requirements were already set out in the German Standard,
issued in 1909).
There are different standards for classification of Portland cement. The two major standards are the
ASTM C150 used primarily in the U.S. and European EN-197. EN 197 cement types CEM I, II, III,
IV, and V do not correspond to the similarly-named cement types in ASTM C 150.
Type I Portland cement is known as common or general purpose cement. It is generally assumed
unless another type is specified. It is commonly used for general construction especially when
making precast and precast-prestressed concrete that is not to be in contact with soils or ground
water. The typical compound compositions of this type are:
55% (C3S), 19% (C2S), 10% (C3A), 7% (C4AF), 2.8% MgO, 2.9% (SO3), 1.0% Ignition loss, and
1.0% free CaO.
A limitation on the composition is that the (C3A) shall not exceed fifteen percent.
which shall consist of at least two-thirds by mass of calcium silicates (3CaO.SiO2 and 2CaO.SiO2),
the remainder consisting of aluminium- and iron-containing clinker phases and other compounds.
The ratio of CaO to SiO2 shall not be less than 2.0. The magnesium content (MgO) shall not
exceed 5.0% by mass." (The last two requirements were already set out in the German Standard,
issued in 1909).
There are different standards for classification of Portland cement. The two major standards are the
ASTM C150 used primarily in the U.S. and European EN-197. EN 197 cement types CEM I, II, III,
IV, and V do not correspond to the similarly-named cement types in ASTM C 150.
Type I Portland cement is known as common or general purpose cement. It is generally assumed
unless another type is specified. It is commonly used for general construction especially when
making precast and precast-prestressed concrete that is not to be in contact with soils or ground
water. The typical compound compositions of this type are:
55% (C3S), 19% (C2S), 10% (C3A), 7% (C4AF), 2.8% MgO, 2.9% (SO3), 1.0% Ignition loss, and
1.0% free CaO.
A limitation on the composition is that the (C3A) shall not exceed fifteen percent.
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