Principles of Cement Classification

Cement is a powder, which mixed with water forms plastic mass, easy to shape (paste), setting with time and hardening gradually with strength increase. In marty standards the more exact Portland cement definitions were introduced. It is necessary because the name of cement is given to other binding materials, for example to anhydrite or magnesium oxychloride (the last is called Sorel cement). 

Presenting the rules of Portland cements classification and derived from them others kind of hydraulic binders, it must be underlined that the basis of this classification are their useful properties. In relation to this that cement is an intermediate product—the raw material for concrete production, these properties will concern the corrverrtiorral rrricro-concrete or the mortar, sometimes paste, and now and again cemerrt itself for example phase composition. Some experts reckon the mortar to some kirrd of concrete, however, it is a subject of controversy. 

Cemerrt corrrposition is the basis for division of cements into kinds Portland, Slag, Pozzolarric the last two with high addition of slag and pozzolana, respectively. 

In the European standards, above all inEN 197-1, another principle was adopted, dividing cement on kinds according to the quantity and kind of mineral additions. However, the division on class is common, independently of cement kind. These rules of division facilitate the classification of cements for concrete production, designated for constractions exploiting in different expositions. 

The fundamental performance properties of cements, being the basis of classification are the following  

---

The presented important principles of cements classification can be divided into three groups form the point of view of paste influence on concrete properties. They ate the following ... 

---