1、May 2009DEUTSCHE NORM English price group 8No part of this standard may be reproduced without prior permission ofDIN Deutsches Institut fr Normung e. V., Berlin. Beuth Verlag GmbH, 10772 Berlin, Germany,has the exclusive right of sale for German Standards (DIN-Normen).ICS 91.100.30!$W_3“1526016www.d
2、in.deDDIN EN 1170-8Test method for glass-fibre reinforced cement Part 8: Cyclic weathering type testEnglish version of DIN EN 1170-8:2009-05Prfverfahren fr Glasfaserbeton Teil 8: Prfung der Dauerhaftigkeit im Klimazyklus-TestEnglische Fassung DIN EN 1170-8:2009-05SupersedesDIN V ENV 1170-8:1996-10ww
3、w.beuth.deDocument comprises 13 pagesDIN EN 1170-8:2009-05 2 National foreword This standard has been prepared by Technical Committee CEN/TC 229 “Precast concrete products” (Secretariat: AFNOR, France). The responsible German body involved in its preparation was the Normenausschuss Bauwesen (Buildin
4、g and Civil Engineering Standards Committee), Technical Committee NA 005-07-08 AA Betonfertigteile (Sp CEN/TC 229). Amendments a) Clause 1 “Scope” specifies how to proceed in the case of other conditions of exposure, e.g. where freezing, thawing and action of thawing salt occurs. b) The figures are
5、now in accordance with the current drawing rules. c) In clause 4 “Apparatus” the temperature of the laboratory has been changed to (20 3) C. d) The standard has been editorially revised. Previous editions DIN V ENV 1170-8: 1996-10 This standard differs from DIN V ENV 1170-8:1996-10 as follows: EUROP
6、EAN 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 testMthode dessai des composites ciment-verre - Partie 8 :Essai type de durabilit par cyclePrfverfahren
7、 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 Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national
8、 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 European Standard exists in three official versions (English, French, German). A version in any ot
9、her 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 national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia,
10、Finland,France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KO
11、MITEE 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: EEN 1170-8:2008 (E) 2 Contents Page Foreword3 Introduction .4 1 Scope 5 2 Normative references 5
12、 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 9 7 Interpretation of test9 Bibliography 11 DIN EN 1170-8:2009-05 EN 1170-8:2008 (E) 3 Foreword This document (EN 1
13、170-8:2008) 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 national standard, either by publication of an identical text or by endorsement, at the latest by April 2009,
14、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 patent rights. CEN and/or CENELEC shall not be held responsible for identifying any or all such patent rights. Thi
15、s 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 national standards organizations of the following countries are bound to implement this European Standard: Austri
16、a, 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 the United Kingdom. DIN EN 1170
17、-8:2009-05 EN 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 parameters to which a glass-fibre reinforced concrete will be subjected under natural exposure conditions: humid
18、ity, 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 correspond to natural weathering during 10 to 20 years. DIN EN 1170-8:2009-05 EN 1170-8:2008 (E) 5 1 Scope Th
19、is 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 temperature on the change of mechanical characteristics. For other conditions of exposure, e.g. whe
20、re 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 dated references, only the edition cited applies. For undated references, the latest edition of the
21、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“ method 3 Symbols and abbreviations 3.1 Symbols L estimate of the loss of resistance: L =ppca; where a
22、p = “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-sided 95 % confidence interval of the mean of the reference sample analysed parameter; MCmean of the in
23、dividual 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 deviation of the individual values of LOP, MORand MORobtained from the sample evaluated after 50 ageing c
24、ycles; 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; LOP stress at the limit of proportionality, in MPa; MOR stress at the limit (Modulus) of rupture, in M
25、Pa. DIN EN 1170-8:2009-05 EN 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 relative humidity of (60 5) %. 4.1 Automatic or manually operated climatic chamber where: a) ambien
26、t 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 flow of (1 0,1) m/s or of renewing air (30 3) times per hour; 4.2 Equipment necessary to carry
27、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 test pieces comprising the sample “C“ subjected to the ageing cycles. NOTE See EN 1170-5 for taki
28、ng the test pieces and determining their length (l). DIN EN 1170-8:2009-05 EN 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 5.2.1 Description This is the complete bending test as specified in EN 1170-5. The odd num
29、bered 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. 5.2.2 Storage 5.2.2.1 “R“ sample The complete bending test of the test pieces of the “R“ sa
30、mple is carried out at (28 0,5) days after storage as specified in EN 1170-5. DIN EN 1170-8:2009-05 EN 1170-8:2008 (E) 8 Figure 2 Schematic diagram showing the storage phases of the “R“ sample 5.2.2.2 “C“ sample The bending test on the test pieces of the “C“ sample is carried out at (128 1) days aft
31、er 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 diagram of the storage phases of the “C“ sample Each ageing cycle comprises the following f
32、our 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 (30 3) times per hour; third phase: (23 0,25) h in hot air at (70 5) C; fourth phase:
33、 (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. DIN EN 1170-8:2009-05 EN 1170-8:2008 (E) 9 Figure 4 Detailed diagram of an ageing cycle for the “C“ sample 6 Expression of results The results are expressed i
34、n 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 significant parameters, calculate the means MRand MCand the standard deviations
35、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 level and n is the number of samples, i.e. in this case: 8895,1The values are g
36、iven in ISO 2602. DIN EN 1170-8:2009-05 EN 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 and 25 ageing cycles. In this way, it is possible to draw a graph of the deve
37、lopment 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“25samples for 10 and 25 ageing cycles respectively. It is essential that all
38、 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 example) reference shall be made to ISO 2602 to calculate the limit of LRor LCin question. DIN EN 1170-8:2009-05 EN 1170-8:2008 (E) 11 Bibliography 1 ISO 2602, Statistical interpretation of test results Estimation of the mean Confidence interval DIN EN 1170-8:2009-05
