1、BS EN1170-8:2008ICS 91.100.40NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBRITISH STANDARDTest method for glass-fibre reinforcedcementPart 8: Cyclic weathering type testThis British Standardwas published under the authority of theStandards Policy andStrategy Committee on 320
2、08 BSI 2008ISBN 978 0 580 57649 2Amendments/corrigenda issued since publicationDate CommentsBS EN 1170-8:2008National forewordThis British Standard is the UK implementation of EN 1170-8:2008. Itsupersedes DD ENV 1170-8:1997 which is withdrawn.The UK participation in its preparation was entrusted to
3、TechnicalCommittee B/524, Precast concrete products.A list of organizations represented on this committee can be obtained onrequest to its secretary.This publication does not purport to include all the necessary provisionsof a contract. Users are responsible for its correct application.Compliance wi
4、th a British Standard cannot confer immunityfrom legal obligations.1DecemberBS EN 1170-8:2008EUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN 1170-8October 2008ICS 91.100.40 Supersedes ENV 1170-8:1996 English VersionTest method for glass-fibre reinforced cement - Part 8: Cyclicweathering type testM
5、thode dessai des composites ciment-verre - Partie 8 :Essai type de durabilit par cyclePrfverfahren fr Glasfaserbeton - Teil 8: Prfung derDauerhaftigkeit im Klimazyklus- TestThis European Standard was approved by CEN on 6 September 2008.CEN members are bound to comply with the CEN/CENELEC Internal Re
6、gulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the CEN Management Centre or to any CEN member.This
7、European Standard exists in three official versions (English, French, German). A version in any other language made by translationunder the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as theofficial versions.CEN members are the n
8、ational standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and
9、 United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGManagement Centre: rue de Stassart, 36 B-1050 Brussels 2008 CEN All rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 1170-8:2008
10、: EBS EN 1170-8:2008EN 1170-8:2008 (E) 2 Contents Page Foreword3 Introduction .4 1 Scope 5 2 Normative references 5 3 Symbols and abbreviations 5 3.1 Symbols 5 3.2 Abbreviation.6 4 Apparatus .6 5 Procedure .6 5.1 Samples 6 5.2 Test method7 5.2.1 Description .7 5.2.2 Storage7 6 Expression of results
11、9 7 Interpretation of test9 Bibliography 11 BS EN 1170-8:2008EN 1170-8:2008 (E) 3 Foreword This document (EN 1170-8:2008) has been prepared by Technical Committee CEN/TC 229 “Precast concrete products”, the secretariat of which is held by AFNOR. This European Standard shall be given the status of a
12、national standard, either by publication of an identical text or by endorsement, at the latest by April 2009, and conflicting national standards shall be withdrawn at the latest by April 2009. Attention is drawn to the possibility that some of the elements of this document may be the subject of pate
13、nt rights. CEN and/or CENELEC shall not be held responsible for identifying any or all such patent rights. This document supersedes ENV 1170-8:1996. From the previous edition, modifications deal with the status of the standard and the scope. According to the CEN/CENELEC Internal Regulations, the nat
14、ional standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
15、 Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. BS EN 1170-8:2008EN 1170-8:2008 (E) 4 Introduction This European Standard prescribes a cyclic wetting and drying test for glass-fibre reinforced concrete. This test incorporates the main ageing paramet
16、ers to which a glass-fibre reinforced concrete will be subjected under natural exposure conditions: humidity, drying, temperature. However, it should be noted that at the end of 50 cycles (humidity/drying /temperature), there is some change of properties for normal GRC formulations. The results corr
17、espond to natural weathering during 10 to 20 years. BS EN 1170-8:2008EN 1170-8:2008 (E) 5 1 Scope This European Standard specifies a test method for identifying, for a given GRC formulation (constituents and their proportions in the formulation), the effect of environmental factors such as water and
18、 temperature on the change of mechanical characteristics. For other conditions of exposure, e.g. where freezing, thawing and action of thawing salt occurs, the test will be adapted. 2 Normative references The following referenced documents are indispensable for the application of this document. For
19、dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 1170-5, Precast concrete products Test method for glass-fibre reinforced cement Part 5: Measuring bending strength, “Complete bending test“ m
20、ethod 3 Symbols and abbreviations 3.1 Symbols L estimate of the loss of resistance: L =ppca; where ap = “after ageing“ performance; and cp = “control” performance; LClower limit of the one-sided 95 % confidence interval of the mean of the analysed parameter after ageing; LRlower limit of the one-sid
21、ed 95 % confidence interval of the mean of the reference sample analysed parameter; MCmean of the individual values of LOP, LOP, MORand MORobtained from the sample evaluated after 50 ageing cycles; MRmean of the individual values of LOP, MORand MORobtained from the reference sample; SCstandard devia
22、tion of the individual values of LOP, MORand MORobtained from the sample evaluated after 50 ageing cycles; SRstandard deviation of the individual values of LOP, MORand MOR obtained from the reference sample; LOP deformation at the limit of proportionality; MOR deformation at the limit of rupture; LO
23、P stress at the limit of proportionality, in MPa; MOR stress at the limit (Modulus) of rupture, in MPa. BS EN 1170-8:2008EN 1170-8:2008 (E) 6 3.2 Abbreviation GRC Glass-fibre reinforced concrete. 4 Apparatus All the equipment is located in a laboratory maintained at a temperature (20 3) C and a rela
24、tive humidity of (60 5) %. 4.1 Automatic or manually operated climatic chamber where: a) ambient temperatures of (70 5) C and (20 2) C can be attained and maintained; b) at least eight test pieces can be stored immersed in water, kept at (20 2) C; c) a ventilation system capable of providing an air
25、flow of (1 0,1) m/s or of renewing air (30 3) times per hour; 4.2 Equipment necessary to carry out the complete bending test as described in EN 1170-5. 5 Procedure 5.1 Samples A total of (2 8) test pieces are taken as shown in Figure 1: eight test pieces comprising the reference sample “R“; eight te
26、st pieces comprising the sample “C“ subjected to the ageing cycles. NOTE See EN 1170-5 for taking the test pieces and determining their length (l). BS EN 1170-8:2008EN 1170-8:2008 (E) 7 Key a 50 mm b = (50 2) mm l see EN 1170-5 Figure 1 Position and identification of the test pieces 5.2 Test method
27、5.2.1 Description This is the complete bending test as specified in EN 1170-5. The odd numbered test pieces (C1, R1, C3, R3, ) are placed with their mould face supported on the bottom rollers and the even numbered test pieces (C2, R2, C4, R4,) with their mould face in contact with the top rollers. 5
28、.2.2 Storage 5.2.2.1 “R“ sample The complete bending test of the test pieces of the “R“ sample is carried out at (28 0,5) days after storage as specified in EN 1170-5. BS EN 1170-8:2008EN 1170-8:2008 (E) 8 Figure 2 Schematic diagram showing the storage phases of the “R“ sample 5.2.2.2 “C“ sample The
29、 bending test on the test pieces of the “C“ sample is carried out at (128 1) days after storage for the first 27 days in accordance with EN 1170-5, then subjected to 50 ageing cycles of (48 0,5) hours and finally immersed for (24 0,25) h in water at (20 2) C (see Figure 3). Figure 3 Schematic diagra
30、m of the storage phases of the “C“ sample Each ageing cycle comprises the following four successive phases: first phase: immersion for (24 0,25) h in water at (20 2) C; second phase: (30 5) min of forced drying at a temperature of (70 5) C in an air flow of (1 0,1) m/s or with the air being renewed
31、(30 3) times per hour; third phase: (23 0,25) h in hot air at (70 5) C; fourth phase: (30 5) min of forced cooling at a temperature of (20 2) C in an air flow of (1 0,1) m/s or with the air being renewed (30 3) times per hour. BS EN 1170-8:2008EN 1170-8:2008 (E) 9 Figure 4 Detailed diagram of an age
32、ing cycle for the “C“ sample 6 Expression of results The results are expressed in accordance with EN 1170-5. 7 Interpretation of test The results of the four significant parameters (LOP, LOP, MORand MOR) are statistically analysed as follows: For each of the two samples “R“ and “C“ and for the four
33、significant parameters, calculate the means MRand MCand the standard deviations SRand SCof the individual values obtained. Then calculate: LC= MC (0, 67 SC) LR= MR (0, 67 SR) RCLLL = NOTE 1 The coefficient 0,67 corresponds to the ratio nt95,0where t0,95is the Student variable for the 95 % confidence
34、 level and n is the number of samples, i.e. in this case: 8895,1The values are given in ISO 2602. BS EN 1170-8:2008EN 1170-8:2008 (E) 10 NOTE 2 In order to have complete information on the change in the mechanical properties of the material, it may be useful to carry out additional tests after 10 an
35、d 25 ageing cycles. In this way, it is possible to draw a graph of the development of the loss of resistance L. However, for this supplementary information to be representative, two test panels as defined in 5.1 shall be made: panel 1: “R“ and “C“50samples for 50 ageing cycles; panel 2: “C“10an “C“2
36、5samples for 10 and 25 ageing cycles respectively. It is essential that all the samples are taken from the same production run and that the number of test pieces for each of them is constant and equal to 8. If it is not possible to meet this last requirement (elimination of an aberrant result, for e
37、xample) reference shall be made to ISO 2602 to calculate the limit of LRor LCin question. BS EN 1170-8:2008EN 1170-8:2008 (E) 11 Bibliography 1 ISO 2602, Statistical interpretation of test results Estimation of the mean Confidence interval BS EN1170-8:2008BSI GroupHeadquarters 389Chiswick High Road,
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