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Technical Information. Test

Frosts resistance
(IT UNITES 22-174-85 in granites and 22-184-85 in marbles and limestones). The test is made on at least three cubical test tubes of 7 cm of edge previously dried in stove to 110ºC. They submerge in water during 48 hours and later ice and defrosting cycles are put under 25, with successive permanence of 20 hours to -15ºC and 4 hours to 15-20ºC. Finally they are weighed in dry and the percentage in lost weight is seen, that it is the frost module.
Resistance to anchorages
(CEN/TC-246-WG2 for Natural Stone, NF B-10.601). Two dry test tubes of 15 xs are used 15 xs 3 cm. In center of the four edges of each test tube, are made cylindrical orifices of 5 mm of diameter and 30 mm of depth. In them are placed a steel bolt of 50 mm of diameter and 5 mm in length by a cement grout. Once it holds the test tube delivers on each bolt a normal effort to the axis until the breakage of the stone. The final value is the means of the 8 determinations, expressed in N.
Thermal Resistance
(IT UNITES 22-197-85 in slates). It uses 5 rectangular or square plates. One stays inalterable. The other four, once dried by heating to 105 ºC until cosntante weight, are submitted to 25 warm cycles in a heater at a temperature of 105ºC for a period of 20 hour and then submerge in water at 20ºC for 4 hour. T the measures are taken when it dries to size the percentage variations of weight and superficial alterations.
Impact strength
(UNITES 22-179-85 in granites, 22-189-85 in marbles and limestones and 22-196-85 in slates). The burst strength is seen of a sample submissive the fall of a metallic sphere from different heights. Placing 4 plates of 20 xs 20 xs 3 cm on sand bed are dropped on them a steel ball of 1 kg from increasing height in 5 cm to the breakage. The result is the average Arithmetic of the resistance in the 4 samples measured in cm.
Frictional Resistance
(IT UNITES 22-173-85 in granites and 22-183-85 in marbles and limestones). It consists of knowing the linear wearing down in mm that takes place in two cubical test tubes of 7 cm of edge being submissive three faces of each one a route of 1 km on an abrasive and under certain load. First the initial volume of each test tube is determined by hydrostatic balance and the faces are moderate to wear away. Next they are put under the test and, finally, the lost volume in relation to the surface of the face is moderate and the average of the two test tubes is taken like result.
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