1、| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | BRITISH STANDARD BS EN 1170-2 : 1998 The E
2、uropean Standard EN 1170-2 : 1997 has the status of a British Standard ICS 91.100.30 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW Precast concrete products Test method for glass fibre reinforced cement Part 2. Measuring the fibre content in fresh GRC, Wash out testThis Brit
3、ish Standard, having been prepared under the direction of the Sector Board for Building and Civil Engineering, was published under the authority of the Standards Board and comes into effect on 15 May 1998 BSI 1998 ISBN 0 580 29182 0 BS EN 1170-2 : 1998 Amendments issued since publication Amd. No. Da
4、te Text affected National foreword This British Standard is the English language version of EN 1170-2 : 1997 published by the European Committee for Standardization (CEN). The UK participation in its preparation was entrusted to Technical Committee B/524, Precast concrete products, which has the res
5、ponsibility to: aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. T
6、he UK voted against this standard at the CEN Formal Vote stage but the analysis of voting, in accordance with CEN/CENELEC Internal Regulations Part 2 : Common rules for standards work resulted in a positive vote. In consequence, the document was accepted as a European Standard. This standard, togeth
7、er with BS EN 1170 : Parts 1 and 3 to 7, supersedes BS 6432 : 1984 which is withdrawn. 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
8、document may be found in the BSI Standards Catalogue under the section entitled International Standards Correspondence Index, or by using the Find facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include all the necessary provisions of a contract. Users of B
9、ritish Standards are responsible 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 6, an inside back cover and a bac
10、k cover.CEN European Committee for Standardization Comite Europe en de Normalisation Europa isches Komitee fu r Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels 1997 CEN All rights of exploitation in any form and by any means reserved for CEN national Members. Ref. No. EN 1170-2 : 19
11、97 E EUROPEAN STANDARD EN 1170-2 NORME EUROPE ENNE EUROPA ISCHE NORM November 1997 ICS 91.100.30 Descriptors: Concrete products, prefabricated elements, composite materials, cements, glass, verification, conformity tests, measurements, fibres, homogeneity, computation English version Precast concret
12、e products Test method for glass fibre reinforced cement Part 2: Measuring the fibre content in fresh GRC, Wash out test Produits pre fabrique se nb e ton Me thode dessai des composites ciment-verre Partie 2: Mesure de la teneur en fibres du CCV frais, me thode dite Se paration par lavage Vorgeferti
13、gte Betonerzeugnisse Pru fverfahren fu r Glasfaserbeton Teil 2: Bestimmung des Fasergehaltes in frischem GFB, Auswaschverfahren This European Standard was approved by CEN on 29 October 1997. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for
14、giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CEN member. This European Standard exists in three official v
15、ersions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgiu
16、m, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom.Page 2 EN 1170-2 : 1997 BSI 1998 Foreword This European Standard has been prepared by Technical Committee CEN/TC 229, Precas
17、t 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 May 1998, and conflicting national standards shall be withdrawn at the latest by May
18、 1998. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norw
19、ay, Portugal, Spain, Sweden, Switzerland and the United Kingdom. Contents Page Foreword 2 1 Scope 3 2 Definition, symbols and abbreviation 3 2.1 Definition 3 2.2 Symbols 3 2.3 Abbreviation 3 3 Apparatus 3 4 Procedure 3 5 Calculations 3 6 Interpreting the test 3 7 Test report sheet 3 Annex A (informa
20、tive) Example of test report sheet 5 Annex B (informative) Evaluation of the uniformity of fibre distribution 6Page 3 EN 1170-2 : 1997 BSI 1998 1 Scope This European Standard specifies a test method for verifying the fibre content and the uniformity of distribution in the finished products and for m
21、onitoring the consumption of fibres. 2 Definition, symbols and abbreviation 2.1 Definition For the purposes of this standard, the following definition applies: matrix Composition of the glass fibre reinforced cement without the fibres. It is made up of the mixture of sand, cement, water and any admi
22、xtures and additives. 2.2 Symbols G c fibre content, in percentage by mass; m mass, in grams. 2.3 Abbreviation GRC Glass fibre reinforced cement. 3 Apparatus The apparatus comprises: one scale, with a measuring range 0 kg to 2 kg, accurate to 0,1 g; one drying oven, capable of maintaining a temperat
23、ure of (105 5)8C, or a set of three infrared lamps, or a muffle furnace capable of maintaining (500 20)8C; three wire sieves, with minimum dimensions of (1753 1003 25) mm or minimum diameter of 200 mm, comprising stainless steel wire of approximately 0,3 mm diameter with an aperture size of 3 mm. Th
24、e sieves can be marked T (top), M (middle) and B (bottom). Soldered sieves cannot be used at temperatures exceeding (105 5)8C; a test board, of approximately (8003 800) mm made of smooth, easy to clean material; a knife, and, if required, a template of inside dimensions (151 2) mm3 (51 2) mm to faci
25、litate cutting out; a rule, accurate to 0,5 mm. 4 Procedure On the flat board, make a sample panel with no facing layer, i.e. made entirely of solid GRC under the same conditions as actual production (premix or spray). Wait 15 min to 30 min. Cut out of the panel, (100 10) mm from the edges, three sa
26、mples with dimensions of approximately (150 2) mm3 (50 2) mm corresponding to the positions represented in figure 1. Weigh each sieve, i.e. m 1 (in grams). Place each sample in its corresponding sieve and weigh, i.e. m 2 (in grams). Wash the sample under a stream of water until all the matrix has be
27、en removed. Dry the sieves in the oven set to (105 5)8C or under the infrared lamps for about 4 h. If a muffle furnace set to (500 20)8C is used, 10 min is sufficient. Reweigh the sieves and fibre, i.e. m 3 (in grams). Record the result in the test record sheet (see clause 7). 5 Calculations The fib
28、re content G c , expressed as a percentage by mass, is given by the following equation: G c = 3 100 m 3 2 m 1 m 2 2 m 1 Round the result to the nearest 0,1 %. 6 Interpreting the test The optimum value is determined by the specification and is a function of the end use. If the result obtained does no
29、t comply with the specified value, carry out a second test to validate the information before making adjustments to the process. NOTE. The deviation between the measured values may be evaluated for each of the three sieves as shown in annex B. 7 Test report sheet The report sheet shall comprise the
30、following elements: the date of test; the identification of manufacture; the specified composition of the GRC; the intermediate results m 1 , m 2 , m 3 ; the fibre content results. NOTE. An example of the test report sheet is given in annex A.Page 4 EN 1170-2 : 1997 BSI 1998 Figure 1. ProcedurePage
31、5 EN 1170-2 : 1997 BSI 1998 Annex A (informative) Example of test report sheet Production control of: . By: . Order and marking of parts Specified composition: Sand: . kg Water: l Cement: kg Plasticizer: kg Polymer: . kg Fibres: . kg Other: kg Consistency (no. of circle): Fibre content: % Consistenc
32、y test (indicate no. of the circle) Morning no. Afternoon no. Comments and actions taken if results unacceptable: Fibre content of fresh GRC (wash out test) Samples T (top) M (middle) B (bottom) Masses g Sieve m 1 Sieve and sample m 2 Sieve and dry fibres m 3 Fibre content (%) 3 100 m 3 2 m 1 m 2 2
33、m 1 Average fibre content (%) = Comments and actions taken if results unacceptable: Spraying test Machine: Operator: Time Empty bucket Fibre roll Bucket + 30 s spray Fibre roll Fibre content Setting of air pressure m 1 m 2 m 3 m 4 3 100 m 2 2 m 4 m 3 2 m 1 gggg( % ) Comments and actions taken if res
34、ults unacceptable: Samples taken for: density bending strength water absorption(*) (*) delete term which does not applyPage 6 EN 1170-2 : 1997 BSI 1998 Annex B (informative) Evaluation of the uniformity of fibre distribution The deviation between the values obtained for each of the three sieves indi
35、cates the degree of regularity of fibre distribution. This deviation can be evaluated as indicated in table B.1. Table B.1 Evaluation of deviation in fibre distribution Deviation observed for sprayed application Evaluation of deviation Deviation observed for premix application Less than 1 % Low to a
36、cceptable Less than 0,5 % Between 1 % and 1,5 % High Between 0,5 % and 1 % Greater than 1,5 % Unacceptable Greater than 1 %blankBSI 389 Chiswick High Road London W4 4AL | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
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