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ASTM C 150 specifies five types of Portland cements:
Type I (GU) Common Portland Cement (or cement for General Use). This is for general construction use where the concrete is not exposed to soil or ground water.
Type II (MS) Moderate Sulfate Resistance. This is for general construction where exposure to sulfate attack is moderate. It is intended to be used for concrete in contact with soil and ground water. An example of this is concrete culvert.
Type III (HE) High-Early Strength Portland Cement. This is to enable achievement of high early strength in concrete such as for precast concrete where early demoulding is required
Type IV (LH) Low Heat of Hydration Portland Cement. This type of cement contains high percentage of C2S and C4AF and relatively lower levels of C3S and C3A. It is used for mass concreting or casting large concrete structures such as dams, retaining walls, transfer beams and piers. Such structures have a low surface-to-volume ratio and as such have a high tendency to demonstrate a high heat of hydration if normal cement is used.
Type V (HS) High Sulfate Resistance Portland Cement. This type of cement has very low C3A levels thus providing high sulfate resistance. It is used for concrete exposed to alkali soil and ground water sulphates which react with C3A causing disruptive expansion.
