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Portland Cement (PC) is the most common form of cement used for general purposes. It is produced from firing a mixture of clay or shale, and limestone or chalk. The clinker produced in the kiln is ground to a fine dust.
Rapid Hardening Portland Cement (RHPC) is Portland cement that is modified (usually by further grinding) to hydrate more rapidly in the first few hours after casting. It is of particular use to manufacturers of precast concrete products because it allows greater productivity from moulds. No longer produced in the UK.
Sulfate Resisting Portland Cement (SRC) is Portland cement that is modified by the control of constituents to have a greater resistance to sulfate attack than Portland cement. It is often used on buried concrete structures in contact with grounds containing sulfates. No longer produced in the UK.
White Portland Cement is Portland cement that is white in colour rather than grey. Because care is needed in the choice of ingredients and in the manufacturing process to ensure the white colour, it is considerably more expensive than ordinary Portland cement. White cement is used for concretes where colour is particularly important.
Acknowledgement: The Concrete Society