1、 g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58The European Standard EN 14845-2:2006 has the status of a British StandardICS 91.100.30Test methods
2、 for fibres in concrete Part 2: Effect on concreteBRITISH STANDARDBS EN 14845-2:2006BS EN 14845-2:2006This British Standard was published under the authority of the Standards Policy and Strategy Committee on 29 September 2006 BSI 2006ISBN 0 580 49303 2Amendments issued since publicationAmd. No. Date
3、 Commentscontract. Users are responsible for its correct application.Compliance with a British Standard cannot confer immunity from legal obligations.National forewordThis British Standard was published by BSI. It is the UK implementation of EN 14845-2:2006.The UK participation in its preparation wa
4、s entrusted by Technical Committee B/517, Concrete, to Subcommittee B/517/11, Fibres for concrete.A list of organizations represented on B/517/11 can be obtained on request to its secretary.This publication does not purport to include all the necessary provisions of a EUROPEAN STANDARDNORME EUROPENN
5、EEUROPISCHE NORMEN 14845-2August 2006ICS 91.100.30English VersionTest methods for fibres in concrete - Part 2: Effect on concreteMthodes dessai des fibres du bton - Partie 2: Influencesur la rsistancePrfverfahren fr Fasern in Beton - Teil 2: Einfluss auf denBetonThis European Standard was approved b
6、y CEN on 26 June 2006.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 standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards
7、may be obtained on application to the Central Secretariat or to any CEN member.This 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
8、tral Secretariat has the same status as the officialversions.CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Pola
9、nd, Portugal, Romania,Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGManagement Centre: rue de Stassart, 36 B-1050 Brussels 2006 CEN All rights of exploitation in any form and by any
10、means reservedworldwide for CEN national Members.Ref. No. EN 14845-2:2006: EEN 14845-2:2006 (E) 2 Contents Page Foreword3 1 Scope 4 2 Normative references 4 3 Principle4 4 Test method4 5 Procedure .4 6 Report .5 EN 14845-2:2006 (E) 3 Foreword This document (EN 14845-2:2006) has been prepared by Tech
11、nical Committee CEN/TC 104 “Concrete and related products”, the secretariat of which is held by DIN. 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 February 2007, and conflicting national standar
12、ds shall be withdrawn at the latest by May 2008. This document has been drafted by working group 11 “Fibres for concrete”, the Secretariat of which is held by BSI. This European Standard is one of a series dealing with test methods for assessing the performance of Fibres, either steel or polymer, in
13、 concrete. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy,
14、 Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EN 14845-2:2006 (E) 4 1 Scope This European Standard specifies a method for determining the effect of fibres, steel or polymer, on the residual fl
15、exural strength of a reference concrete. 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 referenced document (including any amendm
16、ents) applies. EN 14651, Test method for metallic fibered concrete Measuring the flexural tensile strength (limit of proportionality (LOP), residual) prEN 14845-1, Test methods for fibres in concrete Part 1: Reference concretes EN 14889-1, Fibres for concrete Part 1: Steel fibres Definitions, specif
17、ications and conformity EN 14889-2, Fibres for concrete Part 2: Polymer fibres Definitions, specifications and conformity ISO 5725-2:1994, Accuracy (trueness and precision) of measurement methods and results Part 2: Basic method for the determination of repeatability and reproducibility of a standar
18、d measurement method 3 Principle Fibres are tested in one or more reference concretes (as specified in prEN 14845-1) to determine the fibre content required to meet specified values of residual flexural strength at particular deformation levels. 4 Test method Twelve notched 550 mm x 150 mm x 150 mm
19、beams, made from a reference concrete according to prEN14845-1 and incorporating fibres, shall be tested at 28 days in centre-point loading on a 500 mm span in accordance with the test method for metallic fibre concrete of EN 14651. A series of concrete mixes shall be made and tested with different
20、fibre contents until the strength performance specified in clause 5 is achieved. 5 Procedure The content of fibres shall be determined that achieves an average residual flexural strength of at least 1,5 MPa at 0,5 mm CMOD (equivalent to 0,47 mm central deflection) and an average residual flexural st
21、rength of at least 1 MPa at 3,5 mm CMOD (equivalent to 3,02 mm central deflection). When calculating the average performance of the twelve beams, the effect of any outlier (unrepresentative) results should be excluded. Outliers should be identified by the Grubb test according to ISO 5725-2:1994 for
22、a probability of 5 %. NOTE Statistically with an assumed variation of 25%, the mean value of a test series of twelve beams will not deviate more than 10% from the real mean value with a confidence level of 90%. EN 14845-2:2006 (E) 5 6 Report The following information shall be recorded for each set o
23、f reference concrete specimens: a) fibre type (including material, length, diameter and tensile strength) described according to EN 14889-1 or EN 14889-2; b) fibre content in kg/m3, corresponding to the minimum performance levels of 1,5 MPa at a CMOD of 0,5 mm and 1,0 MPa at a CMOD of 3,5 mm; c) det
24、ails of compliance of reference concrete with prEN14845-1, including mix composition and origin of aggregates; d) identification of the test specimens; e) date of manufacture of the test specimens; f) date of notching; g) date of testing; h) curing history and moisture condition of specimens at test
25、; i) average width of each specimen to the nearest 0,1 mm; j) average distance between the tip of the notch and the top of each specimen to the nearest 0,1 mm; k) dimensions of the notch to the nearest 0,01 mm; l) span length to the nearest mm; m) rate of increase of CMOD or deflection and any devia
26、tion from the specified rates; n) load-CMOD curve or load-deflection curve; o) limit of proportionality strength to the nearest 0,01 MPa for individual values and 0,1 MPa for the average value; p) residual flexural tensile strength to the nearest 0,01 MPa for individual values and 0, 1 MPa for the a
27、verage value; q) reference to this European Standard; r) any deviation from this standard. BS EN BSI389 Chiswick High RoadLondonW4 4AL14845-2:2006BSI British Standards InstitutionBSI is the independent national body responsible for preparing British Standards. It presents the UK view on standards in
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