1、BRITISH STANDARD Precast concrete products - Test method for glass-fibre reinforced cement Part 3. Measuring the fibre content of sprayed GRC The European Stanard EN 117-3 : 1997 has the stah of a British Standard ICs 91.100.30 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGH LAW BS
2、 EN 1170-3 : 1998 - STD-BSI BS EN LL70-3-ENGL 1778 lbZibb9 Ob88532 Ob3 AmdNo. Date BS EN 1170-3 : 1998 Text afected National foreword This British Standard is the English language version of EN 11703 : 1997. The UK participation in its preparation was entrusted to “khnid Com M24, Precast concrete pr
3、oducts, which has the responsibility to: - aid enquirers to undemtand the text; - present to the responsible European committee any enquiries on the interpretation, or propods for change, and keep the UK interests informed; - monitor related internationa3 and European developments and promulgate the
4、minthem The UK voted against this standard at the CEN Formal Vote stage but the analysis of voting, in accordance with CENKENELEC Internal Regulations Part 2 : Common mclesfor standards work, resulted in a positive vote. In consequence, the document was accepted as a European Standard This standard,
5、 together with BS EN 1170 : Parts 1,2 and 4 to 7, supersedes BS 6432 : 1984 which is withdram A list of organizatons represented on this committee can be obtained on request to its sectary. Cross-references The British Standards which implement intemational or European publications refed to m this d
6、ocument may be found in the BSI Standards catalogue under the section entitled International Standards Correspondence Index, or by using the Find faciiity of the BSI Standards Electronic Catalogue. Compliance with a British Standard does not of itself confer immunity from legai obligations. Summary
7、of pages This document comprises a front cover, an Wide front cover, the EN title page, pages 2 to 4, an inside back cover and a back cover. This Britbh Standard, having been prepared under the direction of the Sedor Board for Building and Civil Engineering, was published under the authorily of the
8、Sandards Board and comes into effect on 16 March 1998 Q BSI 1998 ISBN O 680 29183 9 STD-BSI BS EN 1170-3-ENGL 1778 m 1b24bb7 b88533 TTT m EUROPEAN STANDARD NOFihE EUROPENNE EUROP- NOFW EN 11703 November 1997 ICs 91.100.30 Descriptors: Concrete products, prefabricated elements, composite materials, c
9、ements, glass, verification, conformity tests, fibres, rates: per unit time, computation English version precast concrete products - method for glasfibm reinforced cement - Part 3 MeasUrin$ the fibre content of sprayed GRC Produits prhbriqus en bton - Mthode dessai des composites ciment-verre - Part
10、ie 3 Mesure de la teneur en fibres des CCV raliss par projection Vorgefertigte Betoneneugnisse - prufverfahen fur Glasfaserbeton - Teil 3 Besihung des Fasergehaltes in =hem GFB beim Spritzverfahren This European Standard was approved by CEN on 29 October 1997. CEN members are bound to comply with th
11、e CENKENELEC Interrd Regulations which stipuate the conditions for giving this European Standard the status of a national standard without any alteration. Upto-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to
12、 any CEN member. This European Standard exists in three official versions (English, French, German). Aversion in any other language made by translation under the responsibhty of a CEN member into its own language and notified to the Central Secretariat has the same status as the official versions. C
13、EN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, fiance, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CEN European Committee for Standardization Comit Europen de
14、Normalisation Europisches Komitee fr Normung Central Secretariat: rue de Stassart 36, B-1060 Brussels O 1997 CEN Ail rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 11703 : 1997 E STD-BSI BS EN L170-3-ENGL 1998 LbZirbbS b88534 93b D Page 2
15、 EN li703 : 1997 Foreword This European Standard has been prepared by 7kchnical Committee CENm 229, Precast concrete products, the secretariat of which is held by AFNOR. This European Standard shall be given the status of a nationai standard, either by publication of an identical text or by endorsem
16、ent, at the latest by May 1998, and conicng donal standards shaii be withdrawn at the latest by May 1998. According to the CENKENELEC interml Regulations, the national standards oqpizations of the following countries are bound to implement this European Stan- Austria, Belgium, Czech Republic, Denmar
17、k, Fnland, France, Gem, Greece, Iceland, Ireland, I*, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom. Contents Foreword 1 Scope 2 Nonnative references 3 Symbols and abbreviation 3.1 Symbols 3.2 Abbreviation 4 4P- 6 Procedure 6 Calculations 7 inteqwetingt
18、hetest 8 Testreportsheet Annex A (hfonnative) Calculation of the equipment outputs Page 2 3 3 3 3 3 3 3 3 3 3 4 - STD-BSI BS EN lL70-3-ENGL 1998 m Lb29bbS Ob88535 872 m Page 3 EN 11703 : 1997 1 scope 5 Procedure This European Standard specifies a test method for venfjmg, during production, the fibre
19、 content of sprayed glassfibre reinforced cement. The test shall be casried out under the same conditions as actual production. Weigh the empty bucket, i.e. ml (in grams). 2 Normative references This European Standard incorporates by dated or undated reference, provisions from other publications. Th
20、ese 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 unda
21、ted references the latest edition of the publication referred to applies. Weigh the glass-fibre roil, i.e. mz(in grams). start the pump and spray the matrix (without fibres) into the waste container for a brief moment. Start the cutter and the stopwatch and spray (matrix and fibres) into the bucket
22、for a time ?t? expressed in s, of not less than 30 s, measured with an accuracy of 1 s. Direct the spray to the waste bucket and stop the cutter and matrix pump. Weigh the bucket iied with fibres and matrix, i.e. m3 Weigh the glass-fibre roil, i.e. m4 (in grams). (i grams). Calculfibe reinforced cem
23、ent - Part 2: Measuring the fibre content in fresh GRC - ?Wash ou,t test? method NOTE. It is possible to carry out a separate output test (fibre only and matrix without fibres) in order to verify in a simplified way, the correct working of the equipment. 3 Symbols and abbreviation 6 Calculations 3.1
24、 Symbols G, fibre content, in percentage by mass; m2 - m4 The fibre content G, expressed as a percentage by weight, is determined by the following equation: x 100 Gc = m mass,ingrams; m3 - ml t time, in seconds. 3.2 Abbreviation GRC glassfibre reinforced cement. 4 Apparatus The apparatus comprises:
25、- 1 bucket, with a capacity of approximately 10 1; - 1 scale, with a measuring range from O kg to 20 kg, accurate to 10 g; - 1 stopwatch, accurate to 1 s; 7 Interpreting the test The optimum value is determined by the specification and is a function of end use. If the result obtained does not comply
26、 with the specified value, cany out a second test to validate the information before making austments to the process. NOTE. The specified fibre content (mean fibre content) is set by the manufacturer ac a function of the variabilit,y of the production so that the glass-fibre content of the products
27、is at least equal to the specified value (see annex A). 8 Test report sheet - 1 container for wate, with a capacity of approxhately 5 1. elements: The test report sheet shd comprise the foliowing - the date of test; - the identification of manufacture; - the specified composition of the GRC; - the i
28、ntermediate results mi, m2, m3 and m4; - the air pressure. NOTE. An example of the test report sheet is given in EN 1170-2. O BSI 1998 STD-BSI BS EN 1170-3-ENGL 1996 = lb24bb9 Ob8653b 709 W Page 4 EN U703 : 1997 Annex A (informative) Cdculation of the equipment outputs The ratio of the fibre output
29、to fibre and matrix outputs combined shall satisfy the following fibre Output X 100 2 specified fibre content 2 specified due. output (fibre + marix) 1 The actual equipment outputs, expressed in kilograms per minute, are obtained fiom the following equations: X60 - output (fibre + matsix) = m3 - ml
30、t x 103 In order to facilitate self-inspection by the operatom, it is useful to estabish a guideline indicating: - the specifml bre content and air pressure values; - the acceptable fibre content variation (0,2 % being the generally accepted value). O BSI 1998 BS EN 1170-3 : 1998 BSI 389 Chiswick Hi
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