Products / Description cement

Cement and concrete are inextricably connected to each other and to construction.

Cement is our trade!

Cemminerals produces a wide range of quality, standardised cements meeting all construction development and customer needs whether they relate to concrete mixing or prefabication plants, screeding applications or wholesale.

What is cement?

Cement is a universal construction material that is used in housing development and non-residential construction as well as in road and other infrastructure works. Almost all construction works begin and end with cement, starting with concrete foundations and going all the way to the finishing.

Cement is a hydraulic binder: a chemical reaction of a finely ground inorganic material with water results in an artificial mineral called cement stone.

The finer the cement powder, the faster the chemical reaction (hydration) takes place. Hydration is an exothermic reaction which is to say produces heat. Solidification can take place both under and above water, the reaction product maintains its strength and stability after solidifying.

Overall, there are different cement types that are labelled CEM I to CEM V and that refer to a lower or higher content of portland cement and blast furnace slag or fly ash.

Cemminerals offers various kinds of CEM I, II and III!

CEM I

portland cement contains no more than 5% of other materials.

CEM II

a variety of portland cement mixes, including mixtures with slate, fly ash and blast furnace slag… contains at least 65% of portland cement.

CEM III

furnace/portland cement mixtures divided into three classes: A,B and C in which CEM III/A contains the least (40%) and CEM III/C contains the most (90%) blast furnace slag.

CEM IV

pozzolan cement varieties (this type of cement is not produced in Belgium).

CEM V

composite cements with mixtures of portland cement, blast furnace slag and pozzolans.

The strength development of a cement is not only determined by its composition but also by its particle size and is divided into classes (32,5 - 42,5 - 52,5). This strength determination is made through a compression test after 28 days. Within each strength class, a distinction is made between ‘Normal’ (N) and ‘Fast’ (F) based on how quickly it develops its strength.

The strength listing of cement only has a limited impact on the desired strength of concretes or mortars. For instance because a lower water to cement ratio may be used than the reference mortar used to establish the cement‘s strength classification. Also the composition of the construction aggregate has an effect on the ultimate strength of the concrete. The maximum strength of a concrete or mortar can therefore not simply be equalled to the strength class of the cement.

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