Highest quality for white, grey Portland cement 42.5/Cement/Plaster/Ordinary

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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.