EN 1342-2012 pdf download.Setts of natural stone for external paving-Requirements and test methods.
4.3 Freezelthaw resistance
4.3.1 Freeze- thaw under normal conditions
When the setts are intended to be used in areas subjected to freeze ana tnaw treeze-tnaw requirements, the freeze/thaw resistance shall be determined using the test method in EN 12371. The results shall be expressed and declared as the mean compressive strength before and alter 56 cycles of freezelthaw (technological test).
The frost damage. which a natural stone may suffer when installed, depends on the climatic conditions of the place of use, the relative position in the works (which determines the degree of saturation) and the predicted service life of the works. This number of cycles is appropriate to a specific project and may help to provide guidance for the interpretation of the test results. The selection of the stones is subjected to climatic zones and/or to codes of practice.
For some specific uses, for example in locations that are subject to temperatures below – 12 °C, it may be appropriate to use different test cycles, e.g. freezing In water, freezing to a lower temperature, or testing specimens embedded in non-porous siliceous granules or a different number of cycles, e.g. the identification test as defined in EN 12371.
4.3.2 Freeze-thaw In the presence of de-Icing salts
Where required, freeze-thaw resistance with the effect of de-icing salts shall be determined and declared. In the absence of a European test method, freeze-thaw resistance with the effect of de-icing salts shall be determined and declared according to national provisions valid in the place of use of the product.
4.4 Breaking strength — Compressive strength
The compressive strength shall be determined using the test method in EN 1926 and the lower expected value (E1) shall be declared.
4.5 Abrasion resistance
The abrasion resistance shall be determined using the test method in EN 14157 and the higher expected value (EN) shall be declared.
It should also be noted that the performance of setts when laid may have a different slip resistance value to that determined on individual setts or test specimens.
NOTE I The unpolished slip resistance value relates to setts as manufactured and helps to ensure adequate slip/skid resistance on instatlation
NOTE 2 Experience has indicated that a USRV measurement made using a wide slider I full swing on a pendulum in wet condthons that Is greater than 35 can usually be considered acceptable for surfaces that are horizontal or sloping at less than 6 %.
4.6.2 Skid resistance
Where required, skid resistance shall be declared.
In the absence of a European test method, skid resistance may be determined and declared according to
national provisions valid en the place of use of the product,
4.6.3 Durability of slip or skid resistance
When required, durability of slip and skid resistance shall be declared.
In the absence of European test methods, durability of slip and skid resistance shall be determined and
declared according to national provisions valid in the place of use of the product.
4.7 Appearance
4.7.1 General
The colour, veining, texture, etc. of the stone shall be identified visually, typically by a reference sample of the same stone suitable for providing a general description of visual appearance.
A reference sample shall be provided by the supplier in accordance with 4.7.2.
4.7.2 Reference sample, visual Inspection and acceptance criteria
A reference sample shall be an adequate number of sells of natural stone of sufficient size to indicate the general appearance of the finished work. They shall indicate the range of appearance regarding the colouring, the vein pattern, the physical structure and the surface finish. In particular the reference sample shall show specific characteristics of the stone, such as specific holes, glass seams, spots, crystalline veins and rusty spots.
The reference samples does not imply strict uniformity between the sample itself and the actual supply; natural variations may always occur.EN 1342-2012 pdf download.
EN 1342-2012 pdf download
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