BS/EN 1606-2013 pdf download.Thermal insulating products for building applications Determination of compressive creep.
6.1 Selection of test specimens
The specimens for determining the compressive creep shad be taken from the same sample. with the same preparation as the specimens used for the compression test as spedfled in EN 826.
The method of selecting the specimens shall be as specified in the relevant product standard.
In the absence of a product standard or any other European Technical Specification, the method of selection of the test specimens may be agreed between parties.
6.2 Dimensions of test specimens
The thickness of specimens shall be equal to the original product thickness. The width of the specimens shall not be less than its thickness. Products with facings or integrally moulded skins which are retained in use shall be tested with these faces or skins intact.
Test specimens shall not be layered to produce a greater thickness for testing.
The specimens shall be squarely cut and have sides with the following recommended dimensions:
50 mm x 50 mm or
100mm x 100mm or
150 mm x 150 mmcx
200 mmx 200mm cx
300 mm x300mm.
The dimensions of specimens shall be the same as used in the compression test as described in EN 826. These are specified in the relevant product standard or agreed between parties.
The linear dimensions shall be determined in accordance with EN 12085, to an accuracy of 0,5%.
The tolerance on parallelism and flatness between the upper arid lower face of the specimen shall not be greater than 0.5 % of its side length, with a maximum of 0,5 mm. If the specimen is not flat, it shall be ground flat or an adequate coating shall be applied to prepare the surface for the test. Where it is coated, no significant creep should occur in the coating or it shall be taken into account by deducting the creep of the coating.
6.3 Number of test specimens
The number of specimens shall be as specified in the relevant product standard. If the number is not specified, then at least three specimens shall be used for each compressive stress selected from 7.2.
In the absence of a product standard or any other European Technical Specification, the number of specimens may be agreed between parties.
6.4 Preparation of test specimens
The specimens shall be cut so that the direction of loading applied to the product will correspond to the direction in which the compressive forces are applied to the product in use.
The specimens shall be cut by methods that do not change the original structure of the product.
For products with non-parallel faces, the parallelism of the upper and lower face of the specimen shall be in accordance with 6.2.
Special methods of preparation, when needed, may be given in the relevant product standard.
6.5 ConditionIng of test specimens
The specimens shall be conditioned for at least 24 h under the test conditions. In case of dispute, the time for
conditioning (equilibrium of moisture content) shall be as specified in the relevant product standard.
7 Procedure
7.1 Test conditions
The test shall be carried out at (23 ± 2) °C and (50 ± 5) % relative humidity.
Other conditions may be given in the relevant product standard or may be agreed between parties.
7.2 Stress selection
The test shall be carried out at three or more different stresses.
To verify one defined level of stress, only this level shall be used
The alternative stresses for the creep test, o. shall be based an either the compressive strength, 0m’ or the compressive stress, o, at 10 % strain measured in accordance with EN 826, and shall be calculated as follows:
o=015x 0m0c.1S)C oe=O,2Ox crmoroc=O.20x c c0,25x 0m07cO,2SX ‘‘10 o-0,30x n01’0c_O.3°X 010 o=0.35x 0m00c0,35X O’iO
If apprnpflate, other values of o may be chosen.
7.3 Test procedure
If the thickness of a specimen, ds, is to be determined without using the loading device, it shall be measured to an accuracy of 0.1 mm, in accordance with EN 12085.
Place the specimen carefully in the loading device, under the dead weight of the loading device. The thickness under this load, d1, is to be considered the reference value for the deformation measurements. Determine dL to the nearest 0,01 mm.
The stress imposed by the “dead weight” shall be less than 10 % of the minimum stress selected for the test.
If the thickness of the specimen, ds, is determined using the loading device, the specimen shall be preloaded by applying a pressure of (250 ± 10) Pa and the thickness measured to an accuracy of 0,01 mm. This value shall then be used as the reference value for the deformation measurements.BS/EN 1606-2013 pdf download.