Table 2. ASTM Types of Portland Cement
Type Name Purpose
IA
Normal-Air Entraining
An air-entraining modification of Type I.
IIA
Moderate Sulfate Resistance-Air Entraining
An air-entraining modification of Type II.
IIIA
High Early Strength-Air Entraining
An air-entraining modification of Type III.
I
Normal
General-purpose cement suitable for most purposes.
II
Moderate Sulfate Resistance
Used as a precaution against moderate sulfate attack. It will usually generate less heat at a slower rate than Type I cement.
V
High Sulfate Resistance
Used as a precaution against severe sulfate action �� principally where soils or groundwaters have a high sulfate content. It gains strength at a slower rate than Type I cement. High sulfate resistance is attributable to low C3A content.
III
High Early Strength
Used when high early strength is needed. It is has more C3S than Type I cement and has been ground finer to provide a higher surface-to-volume ratio, both of which speed hydration. Strength gain is double that of Type I cement in the first 24 hours.
IV
Low Heat of Hydration
Used when hydration heat must be minimized in large volume applications such as gravity dams. Contains about half the C3S and C3A and double the C2S of Type I cement.