1、STD.BSI BS EN 12224-ENGL 2000 BRITISH STANDARD lb24bb9 0877499 724 Geotextiles and geotextile-related products - Determination of the resistance to weathering The European Standard EN 12224:2000 has the status of a British Standard ICs 59.080.70 NO COPYING Wl“H0uT BSI PERMISSION EXCEPT AS PERMITED B
2、Y COPYRIGAT LAW BS EN L2224:2000 STD-BSI BS EN L2224-ENGL 2000 H Lb246b7 0877500 576 BS EN 122242000 National foreword This British Standard is the official E-h language version of EN 122U2000. It supersedes DD ENV 12224: 1997 which is withdrawn. The UK participation in its preparation was entsusted
3、 to Technical Committee B/553, Geomembranes and geotextiles, which has the responsibility to: - aid enquirers to understand the text; - present to the responsible European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; - monitor related in
4、ternaod and European developments and promulgate them in the UK A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement international or European publications referred to in this document may be found i
5、n the BSI Standards Catalogue under the section entitied ?International Stan- Correspondence Index?, or by using the ?Findn facility of the BSI Standards Eleclxonic Catalogue. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are re
6、sponsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 9 and a back cover. The BSI copyright notice displayed i
7、n this document indicates when the document was last issued. This British Standard, having been prepared under the direction of the Sedor Committee for Building and Civil Engineering, was published under the authority of the Standards Committee and comes into effect on 15 November 2000 O BSI 11-2000
8、 Amendments issued since publication Comments ID - 1 h water spray at a black standard temperature of (25 i 3) OC. If required by the equipment, the fluorescent lamps shall be turned off during the spray interval. If the equipment allows, a cycle with a narrower variation of temperature of (50 f 1)
9、“C and a controlled relative humidity of (IO i 5) % during the dry interval should be used. NOTE 1 : The photodegradation of geotextiles, especially those made from polyolefines and polyamides, may be strongly influenced by changes of temperature and relative humidity, e.g. the rate of photo-oxidati
10、on of polyethylene may increase by 8 % if the temperature increases by 1 OC. The radiant exposure shall be 50 MJ/m*. NOTE 2: The durations required to reach a radiant exposure of 50 MJ/m2 have been shown to be approximately: - 320 h for devices with a combination of fluorescent UV lamps; - 350 h for
11、 devices with type I (340 nm) fluorescent lamps if the lamps are left on during the water spray; - 430 h for devices with type I (340 nm) fluorescent lamps if the lamps are turned off during the water spray. Q BSI 11-2000 sTD.BSI BS EN 12224-ENGL 2000 1624669 0677506 794 Page 6 EN 12224:2000 6 Speci
12、mens for determination of change in properties Prepare test and control specimens in accordance with EN 12226:ZOOO. 7 Test procedure 7.1 Mounting of specimens Attach the specimens to the specimen holders in the equipment in such a manner that the specimens are not subject to any mechanical stress. I
13、dentify each test specimen by suitable indelible marking, but not on areas to be used in testing. As a check, retain a plan of the mounting pos t io ns. If an opaque cover is used (see 4.4), the data reported shall also be based on a comparison with control specimens stored separately in the dark. N
14、OTE: If desired, a portion of each test specimen may be shielded by an opaque cover throughout the test. This gives an unexposed area adjacent to the exposed area for comparison. This is useful for checking the progress of exposure. 7.2 Exposure to light sources Before placing the specimens in the t
15、est chamber, ensure that the apparatus is operating at the agreed specified conditions. Maintain these conditions throughout the exposure. Expose the mounted specimens for the specified period of exposure (see Clause 5). NOTE: The position of the specimens in the apparatus should be varied from time
16、 to time to reduce any local inequalities of exposure conditions. If the position of the specimens is adjusted, ensure that they remain the same way up. 7.3 Measurement of radiant exposure If the radiant exposure (H) is to be measured, mount an instrument for measuring radiation so that the radiomet
17、er indicates the UV irradiance at the test specimens exposed surface. Mount the radiation meter on a support for a test panel in such a way that it receives the same radiation as a flat specimen on the same support would receive, and locate it either at the specimen distance or where it has a suffic
18、ient field of view with the detector calibrated for irradiance (for the calibration procedure: see IS0 4892-1). Express the exposure interval in terms of radiant exposure in J/m2 for the UV range. The irradiance (E) in the UV-wavelength range 300 nm to 400 nm or at a specific wavelength in UV (for e
19、xample at 340 nm) shall be stated in the test report. O BSI 11-2000 STD.BSI BS EN L2224-ENGL 2000 L624bb 0877507 920 Page 7 EN 12224:2000 8 Determination of the change in performance of exposed samples The properties of the exposed specimens and controls shall be determined in accordance with EN 122
20、26:2000. 9 Test report The test report shall include the following information: a the number and date of this European Standard; b) the material tested; c) full record of the exposure conditions, including the following: 1) type and model number of the exposure apparatus; 2) type and age of light so
21、urce and wattage; 3) type and age of filters, if applied; 4) if applicable, details of the radiant exposure and radiance at the specimen surfaces and the total number of cycles 5) elapsed exposure time (in hours); 6) spray cycle; 7) the black standard temperature; 8) the relative humidity; d) the ch
22、ange in properties of the exposed specimens. Q BSI 11 -2000 STD.BSI ES EN LZZZ4-ENGL 2000 Lb24bb 0877508 867 Page 8 EN I2224:2000 Annex A (informative) Solar and artificial radiation A.l General The quality and intensity of solar global radiation at the earths surface vary with climate, location and
23、 time. Besides solar radiation there are other important factors that affect natural weathering and ageing process such as temperature, temperature cycling, humidity, etc. Therefore a maximum outdoor exposure of six summer months, as a basis of this index test, can cause a broad variability of resul
24、ts. A minimum of two years of natural exposure at a particular location may be required to minimize the variability among results from repeat exposures. Experience has shown that correlation between results of testing with laboratory light sources and in natural daylight at a particular locality is
25、material dependent. The correlation applies only to that specific type and formulation of material and for the particular properties evaluated. For different types of products, the correlation factor between natural daylight and the same laboratory source may be different. NOTE: See IS0 4892-1 conce
26、rning factors reducing the degree of correlation. A.2 Radiation Polymers are spectrally selective in their reactions to radiant exposure. To ensure that the light source in the exposure apparatus produces the same type of photochemical reaction in the polymer as is produced by natural solar radiatio
27、n, it is important that the relative spectral irradiance of the actinic portion of solar radiation be reproduced as faithfully as possible by the artificial light source. Direct radiation from some fluorescent UV lamps contains considerable amounts of UV radiation of wavelength shorter than that fou
28、nd in solar global radiation and should be appropriately filtered. The exposure to UV radiation with wavelengths shorter than those in terrestrial solar radiation may lead to anomalous results. Q BSI 11-2000 STD-BSI BS EN 12224-ENGL 2000 II 1624667 0877509 7T3 Page 9 EN 12224:2000 Annex B (informati
29、ve) Bibliography CR IS0 I 3434 Guidelines on durability of geofextiles and geotextile-related products Q BSI 11-2000 STDOBSI BS EN 32224-ENGL 2000 BS EN 122242000 BSI 389 Chiswick High Road London w4 4AL 3b24bb 0877530 415 BSI - British Standards Institution BSI is the independent national body resp
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