Koretsky granite Rosa Raveno (Zhadkovsky granite)
|Density or volumetric weight||2695 kg/m³|
|Compressive strength||212 МПа|
|Flexural strength||13,7 МПа|
|Commercial name||Rosa Raveno|
|Quarry location||Ukraine, Rivne region|
|Price tiles 600×300×20 mm polisher.||33 €/m²|
The deposit of this red granite is located in the Koretsky district of the Rivne region, near the village of Zhadkovka. For this reason, this granite is often called Zhadkovka, or Koretsky. In fact, he has an officially registered trademark – ROSA RAVENO. The color of this granite ranges from rich red with black blotches to light red and pink. It is perfectly heat-treated, while the color of granite shifts towards pink. We also produce products with a smooth polished surface – which is not shiny and not as slippery as polished. The chipped surface of this red-pink granite in paving stones or chipped tiles can effectively decorate any facade.
Physical and mechanical properties of Koretsky granite
Note that these properties are very important when designing facades, stairs and granite cladding. The apparent average density of granite from the Korets deposit is determined in accordance with EN 1936. For this, several samples of stone 50x50x50 mm in size with a sawn surface are submitted to a certified laboratory. The average apparent density of this rock is 2695 kg/m³.
Laboratory tests for open porosity of granite from the Koretsky quarry showed results of 0.41% by volume.
Water absorption of granite from the Koretsky deposit
This is perhaps one of the most important performance indicators of granite. It directly determines the frost resistance of facade slabs and paving. As well as the resistance of countertops made of this granite to pollution, which penetrate the surface of the stone along with water. To determine the level of water absorption, samples of Koretsky granite measuring 5x5x5 centimeters were also used. Sample testing in accordance with EN 13755 showed an excellent result for this building stone – 0.15% by weight, at atmospheric pressure. For comparison: conventional ceramic bricks have a water absorption of 5-8%!
This indicator is very important for materials that are used for paving or flooring. That is, wherever there is an abrasive load on granite. Abrasion resistance, or stability, shows how many mm³ the material will lose when 1 million passers-by pass over a given area. Testing was carried out in accordance with EN 14157. For this, a sample of Koretsky granite was taken, 70×70 mm in size and 30 mm thick.
Laboratory tests showed an average level of: 5600 mm³/500 mm². This means that when passing through the test sample of the 1st million people, it reduced its thickness by only 1.2 mm. This is a great indicator!
Tests to determine the compressive strength of Zhadkovsky graniteRosa Raveno
Strength testing is carried out in two directions: to identify the ultimate flexural strength, and the ultimate compressive strength. The bending strength limit of granite sets the limits of rock destruction under bending loads: steps of stairs made of stone, paving slabs, under which the base is partially missing. Compressive pressure limit – shows what maximum load the tested sample of granite can carry, with a solid base under it.
This test is carried out in accordance with EN 1926. For this, a sample of Zhadkovsky granite 50x50x50 mm was used. Testing showed that the sample failed at a pressure of 212 MPa under uniaxial compression. This means that the press pressed on the surface of a 5×5 cm granite sample with a force equivalent to 53 tons!!! And only with such a colossal load did the granite sample collapse.
Compression test after 56 freeze-thaw cycles
In accordance with EN 1926, samples of Rosa Raveno granite, 50x50x50 mm in size, are initially frozen – thawed 56 times (according to EN 12371 test rules). Then tests are carried out on a hydraulic press. This testing showed that Zhadkovsky granite after 56 freeze-thaw cycles has a maximum load in uniaxial compression – 198 MPa. And this is 49.5 tons for an area of 5×5 cm.
Determination of the bending strength of Koretsky graniteRosa Raveno
Testing was carried out in accordance with EN 12372. For this, 10 sawn samples of Koretsky granite with a size of 300x50x50 mm were used. The tests were carried out using the concentrated load method. The average value of the bending stress turned out to be 13.7 MPa. In this case, the standard deviation of the obtained values was 0.39 MPa. The minimum value of the breaking pressure on 10 samples was 13.2 MPa.
Determination of the bending strength of Koretsky granite after 56 freeze-thaw cycles
This test is also carried out with samples measuring 300x50x50 mm. According to EN 12371, 10 granite samples are initially frozen and then thawed 56 times. Then, according to the rules of the EN 12372 standard, tests are carried out for the susceptibility to bending loads. These tests showed that for Koretsky granite, after exposure to 56 cycles of freezing and thawing, the average ultimate breaking pressure for bending is 12.2 MPa. In this case, the average deviation of values for 10 samples was 0.46 MPa.
Frost resistance testing
Determination of frost resistance of granite Rosa Raveno was carried out on the same 10 samples, format 300x50x50. All test procedures were carried out in accordance with EN 12371, test A. The frost resistance index indicates how much the strength and visual qualities of the stone deteriorate after 56 cycles of freezing and subsequent thawing, after soaking the samples in water.
As shown by two previous tests, after passing 56 cycles of frost testing, the ultimate bending strength index decreased from 13.7 MPa to 12.2 MPa. This means that the ultimate flexural strength has decreased by 10.9%. The average weight loss for ten samples was 0.8 grams. Let’s take into account that the initial mass of the Zhadkovsky granite sample was: 0.3×0.05×0.05×2695 = 2021 grams. Then the average weight loss after cold testing was: 0.8/2012 = 0.04%.
For an igneous rock – granite, such an analysis is carried out in accordance with the EN 12407 standard. It showed the presence of characteristic high-strength minerals in the composition of Rosa Raveno granite. The results of the analysis are presented in the table:
|Minerals / Crystals|
|Impurities (apatite, precious metals, zircon)||2|