Quality Control

Our plants operate laboratories for cement quality control. We test products at all stages of production. To that end, our laboratories are equipped with all the necessary modern equipment.

Incoming control

The production process begins with quarrying raw materials and carefully verifying their quality parameters. We determine whether they meet the requirements of the standards and the internal process regulations. The chemical and mineral composition and physical properties of raw materials are integral factors ultimately influencing the quality of finished products.

We mine clay, limestone and marl in our quarries and buy corrective additives for clinker production, additive components for cement, and gypsum stone only from verified reliable suppliers.

Operational control

At each production stage, we test semi-finished products for compliance with technical specifications. For instance, at the raw mill stage, we check the fineness and chemical composition of the raw meal; at the stage of the burning of Portland cement clinker, we check its chemical and mineral composition. At the cement mill stage, we regularly take cement samples and analyse them for sulphur trioxide content (SO₃; a component of gypsum stone), the content of additive components for cement, and determine the fineness of the cement.

Control of finished products

This stage involves testing the cement for all quality indicators in accordance with the applicable standard. The cement is tested for the following parameters:

cone slump
compressive strength at 2/7 and 28 days
uniformity of volume change
normal density of cement paste and setting times

content of SO₃ and active mineral additives
content of Cl- chloride ions and alkalis
mineralogical composition

We provide each consumer with a quality document which details all the necessary indicators and results of the product radiation control.