What are the different kinds of cement?

Five kinds of cement are recognized by European Standard EN 197-1. They are identified by a ‘CEM’ number. These CEM cements are made from different materials and each is of a statistically uniform composition.

CEM I is ordinary Portland cement, i.e. cement comprising at least 95% clinker. CEM II refers to Portland composite cements, the most common being Portland-limestone cement, Portland-slag cement, and Portland-fly ash cement. CEM III refers to blastfurnace cement, comprising clinker and blastfurnace slag in different proportions. CEM IV is pozzolanic cement, and CEM V is composite cement.