The properties of cement that dictate its features

Cement is known to humanity since time immemorial and was used by the ancient Egyptians. Over the past millennia, many varieties of this material have been developed, because the masters of each country used raw materials that were located in the area, and this raw materials differed in various characteristics from raw materials from other regions of the planet. Cement plants have their own fields of clay and limestone, so Russian cement will differ significantly from, for example, of English or German. And even to the question «How to make cement?»Different masters will give you many variable tips. To bring the characteristics of different cements to unified norms and requirements, a marking was developed and introduced, which denotes the technological characteristics of the material. What are these characteristics?