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Concrete mixtures

Concrete is an artificially-made stone material obtained through setting of rationally selected, uniformly mixed and compacted mixture of binding substance (cement), water, aggregates and modifying agents.

The first sample of concrete ever known to science was found on the shore of the Danube, in one of the most ancient human settlements, and can be dated back to approximately to the year 5600 B.C. The composition of the first concrete used for making a 25 cm-wide floor slab included gravel and red limestone. Over the course of further ages this construction material proved to be long-lasting, fire-proof and reliable.

The present-day offers hundreds of compositions to make concrete of various density, strength, water impermeability, etc., depending on purpose and sphere of application. The «Concrete by Kovalska» trademark offers a wide range of concrete types intended for multiple construction applications. Specified below are the basic parameters of concrete classification so that the clients can better understand the specific features of our products.

Grades and classes of concrete. Designing of concrete and reinforced-concrete structures requires prior defining of the necessary concrete characteristics: strength grade, frost resistance grade, and water impermeability grade.

Strength grade of concrete indicates its resistance to axial compression applied to test samples (kg/cm2). The following concrete grades are employed in the sphere of construction: М50, М75, М100, М150, М200, М250, М350, М400, М450, М550, М600, М700, М800.

The class of concrete is typically represented by a numeric value relating to its particular property, and accepted at the guaranteed probability of 0.95. This means that any property established within a certain class is ensured in no less than 95 cases out of 100, so that in only 5 remaining cases such property cannot be perfectly guaranteed. Concrete comes in the followings classes: В1; В1,5; В2; В2,5; В3,5; В5; В7,5; В10; В12,5; В15; В20; В25; В30; В40; В45; В50; В55; B60.

The table below species the relations between concrete class and strength grade:

Concrete frost resistance grade indicates the maximum number of cycles of repeated frosting and defrosting which are applied to test samples of certain size under no deterioration of compression strength below 5% as contrasted to the strength of samples tested in equivalent age. In case with road concrete no weight loss below 5% is also taken into account. A of the present day, the following frost resistance grades of concrete exist: F50, F75, F100, F150, F200, F300, F400, F500.

Concrete water impermeability grade represents the water pressure under which the test samples are impermeable to water at the standard testing conditions. The following water impermeability grades of concrete have been established: W2, W4 W6, W8, W10, W12.

The «Concrete by Kovalska» trademark offers a wide range of concrete mixtures of various time yield, strength, water impermeability and class, intended for multiple consumer purposes.

Use the following telephone number to check the complete list of products and new positions: (044) 239-07-60, 239-07-70.