ДСТУ Б EN 1108:2013
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page 1 2 3 4 5 6 7 7.1 7.2 7.3 7.4 8 9 9.1 9.2 10 1 Scope 1
2 Normative references 1
3 Terms and definitions 2
4 Principle 2
5 Apparatus 2
6 Sampling 4
7 Preparation of test specimens 4
7.1 General 4
7.2 Bonding with hot bitumen 5
7.3 Bonding by torching 5
7.4 Preparation of bonded test specimens 5
8 Procedure 6
9 Recording of results, evaluation and
precision of test method 7
9.1 Recording of results and evaluation 7
9.2 Precision of test method 8
10 Test report 8 EN 1108:1999 - - - -
^AЦ?IO^AЁ?Ь?^И?Й? B FLEXIBLE SHEETS FOR WATERPROOFING -BITUMEN SHEETS FOR ROOF WATERPROOFING -DETERMINATION OF FORM STABILITY UNDER CYCLICAL TEMPERATURE CHANGES
1 2 ISO 5725:1986 1 Scope
This European Standard specifies the determination of form stability under cyclical temperature changes. It is mainly applicable to metal faced and/or metal cored bitumen sheets fully bonded to a substrate.
This test is not intended to be applied to vapour control layers.
2 Normative references
This European Standard incorporates by dated or undated reference provisions from other publications. These normative references are cited at the appropriate places in the text and the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this European Standard only when incorporated in it by amendment or revision. For undated references, the latest editions of the publication referred to applies. .
ISO 5725:1986 Precision of test methods - Determination of repeatability and reproducibility for a standard test method by inter-laboratory tests.
3 3.1 4 5 5.1 5.2 5.3 5.4 5.5 5.6 5.7 3 Definitions
For the purposes of this standard the definitions indicated in 3.1 and in the corresponding European Standards on product specifications apply.
3.1 form stability:
The change in length of a test specimen taken from a bitumen sheet, containing a metal foil, when subjected to specified cyclical temperature change.
4 Principle
The test specimens taken from the test sample are fully bonded to a dimensionally stable and heat resistant insulate and subjected to ten cycles of thermal stressing of the upper face. The change in dimensions is measured after each cycle and evaluated at the end of the test.
5 Apparatus
5.1 Length measuring device , measuring length of at least 2000 mm, with a scale division of at least 1 mm.
5.2 Metal cooling block (approximately 2200 mm 5.3 Insulation panels , made of cellular glass with a density of approximately 125 kg/m 3 and approximately 40 mm thick.
5.4 Four calibrated thermocouples , connected to an electronic thermometer with a recorder and capable of measuring to 5.5 Matt black paint , for colouring the metal facings.
5.6 Four measuring marks of adjustable height (e.g. penetration pins) securely connected to the cooling block outside the test specimens (see figure 1).
5.7 Four measuring marks on the test specimen surface (e.g. razor blade bonded with solvent free adhesive, see figure 1).
■? □? 4 ♦? 1 (1) (2) (3) (4) Legend:
■? measuring marks on the sample surface and cooling block
□? 4 thermocouples
♦? 1 control thermocouple
(1) test specimens (A and B)
(2) thermal insulation (cellular glass)
(3) infrared heater
(4)
metal block with water cooling
5.8 5.9 l^ 5.10 5.11 6 ^ 7 7.1 5.8 Precision length measuring device (e.g. graduated magnifying glass) for measuring the distance between the two measuring marks to the nearest 0,1 mm.
5.9 Infrared radiation source , with thermostatic control for uniform heating of the bitumen sheet surface to 70 5.10 Bonding bitumen : oxidized bitumen with a softening point (ring and ball) between 80 5.11 Insulated screens , to protect the test specimen against draughts from the sides.
6 Sampling
Test samples shall be taken in accordance with the corresponding European Standard.
Two rectangular test specimens with dimensions of approximately 2000 mm After taking the test specimens, they are conditioned for at least 24 h at (23 7 Preparation of test specimens
7.1 General
Bond the cellular glass panels to the top of the cooling block with hot bitumen so that the top of the metallic block is covered up to the measuring marks at the edges (see figure 1).
The cellular glass panels shall form a flat surface.
Fully bond the two test specimens approximately 40 mm apart to the cellular glass base as specified in 7.2 or 7.3 with the bottom facing downwards.
7.2 3’ 7.3 7.4 7.2 Bonding with hot bitumen
When bonding with hot bitumen, first place the two test specimens loosely on the cellular glass so that they are approximately 40 mm apart then roll back one test specimen half way and unroll it into a pool of molten bitumen at approximately 180 7.3 Bonding by torching
In the case of bonding by torching, a uniform layer of hot bitumen (approximately 1,5 kg/m 2 ) is first applied to the cellular glass and is allowed to cool. The two test specimens are laid loosely on the prepared surface and arranged. Then, one test specimen is rolled back half way. The bonding mass on the lower face of the test specimen is heated with a gas flame so that when it is rolled back molten bitumen coating is always in front of the roll and a bubble free bond is obtained. The same procedure is used for the second half of the test specimen. The second test specimen is bonded in the same way approximately 40 mm from the first.
7.4 Preparation of bonded test specimens
After the test specimens have cooled down, four thermocouples shall be attached to the upper face of the test specimens as shown in figure 1.
The thermocouple for controlling the radiant heater shall be placed directly adjacent to one of the middle thermocouples.
Four measuring marks shall also be attached to the ends of the test specimens by means ofa solvent free adhesive. The measuring marks on the test specimens shall be opposite and in line with the measuring marks on the cooling block (see figure 1).
8 - - - 4 - 2 - 4 - 14 The surfaces of the test specimens and the thermocouples are painted matt black.
This test assembly is conditioned at (23 8 Procedure
Prior to commencing the test, the initial lengths of the two test specimens are measured:
- Measure the initial lengths of the two test specimens, L A and L B , to the nearest 1 mm with the ruler (see figure 1).
- Measure the distances 1 1 (0) to 1 4 (0) between the four measuring marks on the cooling block and the measuring marks on the test specimens with the optical instrument to the nearest 0,1 mm (see figure 1).
Then, using the radiant heater, the test specimens are subjected to ten heating cycles as follows:
- 4 h - 2h - 4 h - 14 h The time- and position-dependent variation in the temperature at all four measuring points shall not exceed 8 The heating time taken to reach steady-state shall not exceed 30 min.
To ensure the required constant temperature, the radiant heat source shall be thermostatically controlled by means of control thermocouples. Where necessary, the open side areas between the radiant heater and the test specimen surface shall be covered with heat-insulated plates. The temperatures shall be recorded continuously during the test cycles. Throughout the tests, the cooling block shall be kept by forced cold water circulation at a uniform temperature no greater than 22 9 9.1 At the end of each cycle z (at the end of the 14-h cooling phase) the distances 1 1 ( z ) to 1 4 ( z ) are measured again to the nearest 0,1 mm. The test specimens shall also be examined for any visible changes.
9 Recording of results, evaluation and precision of test method
9.1 Recording of results and evaluation
The change in dimensions A L , in %, is calculated after each cycle z using equation (1) for test specimens A or equation (2) for test specimen B:
a A L A L 1 ( z ) + A L 2 ( z )
A L A ( z ) = 2^A x 100,
L A
A L 1 ( z ) 3^ - - - K (2)
where L A , L B is the initial length of test specimens A and B.
A L 1 ( z ) lo A L 4 ( z ) is the change of L 1 to L 4 after cycle z compared to the relevant initial measurement L 1 (0) to L 4 (0); e.g. A L 1 ( z ) = L 1 ( z ) - L 1 (0).
The values shall be determined to the nearest 0,01 %. They are plotted in a graph and evaluated as follows (see example in figure 2) with the first three temperature cycles for stabilizing the test specimens:
- determination of the value after the third cycle A L (3)
- determination of the maximum value between the third and tenth cycle, A L max
- determination of the difference
AA L = A L max -A L (3).
These values are determined for each test specimen and the mean value shall be reported to the nearest 0,01 %. The form stability is the difference AA L reported to the nearest 0,01 %.
Specific incidences or occurrences such as the need to repeat the test or visible external changes to the test specimens during the test (e.g. delamination, creasing, blisters) shall be stated.
Figure 2 - Evaluation for a test specimen (example)
9.2 ^е?м?а? 10 а?) b) с?) d) e) 9.2 Precision of test method
No information can be given at present on the precision of the measuring method: no results from inter-laboratory tests as specified in ISO 5725:1986 are yet available.
10 Test report
The test report shall include at least the following information:
a) all details necessary to identify the product tested;
b) a reference to this Standard (EN 1108), and any deviation from it;
c) information on sampling in accordance with clause 6;
d) details of preparation of the test specimens in accordance with clause 7;
e) the test results in accordance with 9.1;
f) the date of the test. **********