DD ENV 10080-1996

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DRAFT FOR DEVELOPMENT DD ENV10080:1996

Steel for thereinforcement of

concrete

Weldable ribbed

reinforcing

steel B500

Technical delivery

conditions for bars,

coils and welded fabric

ICS 77.140.60; 91.080.40

LicensedCopy:SheffieldUniversity,UniversityofSheffield,25March2003,UncontrolledCopy,(c)

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DD ENV 10080:1996

This Draft for Development,having been prepared underthe direction of the EngineeringSector Board, was publishedunder the authority of theStandards Board and comesinto effect on15 March 1996

BSI 08-1999

The following BSI referencesrelate to the work on thisstandard:

Committee reference ISE/9Draft for comment 91/44813 DC

ISBN 0 580 25196 9

Committees responsible for thisDraft for Development

The preparation of this Draft for Development was entrusted to Technical

Committee ISE/9, Steel for concrete reinforcement, upon which the followingbodies were represented:

British Cement AssociationBritish Iron and Steel Producers AssociationBritish Precast Concrete Federation Ltd.Concrete SocietyCounty Surveyors SocietyDepartment of TransportFederation of Civil Engineering ContractorsInstitution of Structural Engineers

UK Certification Authority Reinforcing Steels

Amendments issued since publication

Amd. No. Date Comments


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Contents

PageCommittees responsible Inside front cover

National foreword iiForeword 2Text of ENV 10080 5List of references Inside back cover


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National foreword

This Draft for Development has been prepared by Technical Committee ISE/9and is the English language verision of European Prestandard ENV 10080 Steelfor the reinforcement of concrete Weldable ribbed reinforcing steel B500

Technical delivery conditions for bars, coils and welded fabric published by theEuropean Committee for Standardization (CEN).This publication is not to be regarded as a British Standard.

It is being issued in the Draft for Development series of publications and is of aprovisional nature. It should be applied on this provisional basis so thatinformation and experience of its practical application may be obtained.Comments arising from the use of this Draft for Development are requested sothat UK experience can be reported to the European organization responsible forits conversion to a European Standard. A review of this publication will beinitiated 2 years after its publication by the European organization so that adecision can be taken on its status at the end of its 3 year life. The commencementof the review period will be notified by an announcement inBSI News.

According to the replies received by the end of the review period, the responsibleBSI Committee will decide whether to support the conversion into a EuropeanStandard, to extend the life of the prestandard or to withdraw it. Commentsshould be sent in writing to the Secretary of BSI Technical Committee ISE/9at 389 Chiswick High Road, London W4 4AL giving the document reference andclause number and proposing, where possible, an appropriate revision of the text.This Draft for Development has been published to enable ENV 10080 to be usedin the design of steel reinforced concrete structures conforming to ENV 1992-1-1and to develop data on the properties available from reinforced steels.The UK has consistently objected to aspects of this ENV, particularlyitems 2), 3), 5) and 7) of the foreword of ENV 10080.It is unlikely that the UK will vote positively on any proposed European Standard

on this subject until these points are satisfactorily resolved.Cross-references

Publication referred to Corresponding British Standard

BS EN 10002 Tensile testing of metallic materialsEN 10002-1 Part 1:1990 Method of test at ambient temperatureEN 10002-2 Part 2:1992 Verification of the force measuring system of

the tensile testing machine

EN 10002-4 Part 4:1995 Verification of extensometers used in uniaxialtesting

EN 10020 BS EN 10020:1991Definition and classification of gradesof steel

BS EN 10027Designation systems for steelEN 10027-1 Part 1:1992 Steel names, principal symbolsEN 10027-2 Part 2:1992 Steel numbersEN 10079 BS EN 10079:1993Definition of steel productsEN 29002 BS EN ISO 9002:1994 Quality systems. Model for quality

assurance in production, installation and servicing

EN 45011 BS 7511:1989 General criteria for certification bodiesoperating product certification

EN 45012 7512:1989 General criteria for certification bodiesoperating quality system certification

Summary of pages

This document comprises a front cover, an inside front cover, pages i and ii,

the ENV title page, pages 2 to 24, an inside back cover and a back cover.This standard has been updated (see copyright date) and may have hadamendments incorporated. This will be indicated in the amendment table on theinside front cover.


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EUROPEAN PRESTANDARD

PRNORME EUROPENNE

EUROPISCHE VORNORM

ENV 10080

April 1995

ICS 77.140.60; 91.080.40

Descriptors: Reinforced concrete, reinforcement structures, prestressing steels, reinforcing steels, metal bars, welded wire lattice,designations, classifications, chemical composition, grades: quality, mechanical properties, dimensions, tests, weldability,delivery

English version

Steel for the reinforcement of concrete Weldable ribbedreinforcing steel B 500 Technical delivery conditions for

bars, coils and welded fabric

Acier pour larmature du bton Armaturespour bton arm soudables verrous B 500 Conditions techniques delivraison pour les barres, les couronnes et lestreillis souds

Betonbewehrungsstahl Schweigeeignetergerippter Betonstahl B 500 TechnischeLieferbedingungen fr Stbe, Ringe undgeschweite Matten

This European Prestandard (ENV) was approved by CEN on 1995-01-26 as aprospective standard for provisional application. The period of validity of thisENV is limited initially to three years. After two years the members of CEN

will be requested to submit their comments, particularly on the questionwhether the ENV can be converted into a European Standard (EN).CEN members are required to announce the existence of this ENV in the sameway as for an EN and to make the ENV available promptly at national level inan appropriate form. It is permissible to keep conflicting national standards inforce (in parallel to the ENV) until the final decision about the possibleconversion of the ENV into an EN is reached.CEN members are the national standards bodies of Austria, Belgium,Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy,Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland andUnited Kingdom.

CEN

European Committee for StandardizationComit Europen de NormalisationEuropisches Komitee fr Normung

Central Secretariat: rue de Stassart 36, B-1050 Brussels

1995 All rights of reproduction and communication in any form and by any means reserved in allcountries to CEN and its members.

Ref. No. ENV 10080:1995 E


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Foreword

a) HistoryThis European Prestandard has been preparedby SC 1, Reinforcing steels not for prestressing,of the Technical Committee ECISS/TC 19,Concrete reinforcing steel Qualities,dimensions, and tolerances, of which theSecretariat is held by DIN.The work of ECISS/TC 19/SC 1 started in 1988with the aim to transform

into a European Standard (EN) with unified

specifications for the mechanical anddimensional properties of bars, coils and weldedfabric of reinforcing steels suitable to meet therequirements for the design of concretestructures.There were nine plenary meetings ofECISS/TC 19/SC 1 with the participation of intotal 17 member countries and of representativesof the organizations to which liaison had beenestablished such as CEN/TC 250/SC 2(Structural Eurocodes; Eurocode 2: Design ofconcrete structures), ISO/TC 17/SC 16 (Steels forthe reinforcement and prestressing of concrete),

and the European Fabric ReinforcementAssociation (EFRA). Although somefundamental agreements could be achieved(e.g. with regard to the number of strengthlevels, weldability, size ranges etc.) it was notpossible, even after a 5 year period of debate, toget the approval of a qualified majority of themember countries to the publication of a genuineEuropean Standard. Thus a proposal wasadopted in the meeting of ECISS/TC 19/SC 1 inMay 1993 and confirmed by the results of awritten enquiry in November 1993 to give thepresent document containing the delivery

conditions for the weldable ribbed reinforcingsteels B500A and B500B the status of aEuropean Prestandard (ENV) for the reasonsmentioned below.

b) Reasons for the publication of a PrestandardENV 10080

In the existing national standards thespecifications for reinforcing steels differ to aconsiderable extent as a result of the differencesof traditions and material requirements. Henceit was often difficult to obtain the compromisesnecessary to get unified European deliveryconditions. Some of the specifications laid downin the present document were only supported bya slight majority of votes [see also item c)]. Oneof the main questions was how to attain a closealignment of the material specifications with therules for the design of concrete structurescovered by the Eurocodes 2, 4 and 8. The

decision to publish Eurocode 2 as a EuropeanPrestandard (ENV 1992-1-1Design of concretestructures Part 1.1: General rules and rules forbuildings) open for modification and completionwithin a reasonable space of time promoted thedecision of ECISS/TC 19/SC 1 to publish thepresent document as a European Prestandardtoo. The lifetime of ENV 10080 should beharmonized with that of ENV 1992-1-1. Thisperiod is necessary to carry out thoroughinvestigations and to collect sufficient experienceabout the correlation and compatibility betweenthe material properties to be specified and the

criteria for the design and execution of theconcrete structures.c) Main items to be rediscussedAll interested parties are requested to draw theirspecial attention to the following items whichhave been controversially discussed during theprevious meetings ofECISS/TC 19/SC 1 and shall be reconsideredwhen transforming ENV 10080 andENV 1992-1-1 into European Standards:

1) whether the rules for the design of concretestructures according to Eurocodes 2, 4 and 8

require the standardization of two or of morethan two categories of steel grade B500 withdifferent ductility values;NOTE ECISS/TC 19/SC 1 is in favour of standardizing(eventually in a separate EN) a B500 category withductility values higher than those specified for B500B ifsuch a category is considered to be necessary in view of therequirements of Eurocode 8 (building in seismic regions) orto other applications (e.g. nuclear power stations, marinestructures etc.).

2) whether the total elongation at maximumforce (Agt) may be regarded as a moresignificant characteristic for the evaluation ofthe service behaviour of reinforcing steels than

the elongation at fracture (A5 orA10),

EURONORM80-85

Reinforcing Steel (not forprestressing); technicaldelivery conditions,

EURONORM82-1:79 Steel for the reinforcement ofconcrete with an improvedbonding action; dimensions,mass, tolerances. Generalrequirements, and

EURONORM82-2:79

Steel for the reinforcement ofconcrete with an improvedbonding action; dimensions,mass, tolerances.Supplementary specificationsfor ribbed steels


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3) whether in addition to characteristic values(in the sense of the definition in 3.8) minimum

values should be specified forAgt andRm/Re (see Table 1);4) whether fatigue strength values should bespecified for welded fabric (see Table 1);5) whether the details of testing the fatigueproperties are acceptable (see 6.3.4);6) whether the permissible deviation fromnominal mass should be increased(e.g. to 6 %) for small product diameters(e.g. up to 10 mm) (see Table 1 and 6.4.2);7) whether the certification procedures asdescribed in clause 7 and Annex A should be

maintained as the sole possible system for theverification of the conformity of the steels withthe specifications of the standard.NOTE The requirements laid down in Annex A are therecommendations of ECISS/TC 19/SC 1. It is recognizedthat the Commission of the European Union has theultimate responsibility for setting the level of theattestation of conformity for the products covered byENV 10080.

In accordance with the CEN/CENELEC InternalRegulations, the following countries are bound toimplement this European Prestandard: Austria,Belgium, Denmark, Finland, France, Germany,Greece, Iceland, Ireland, Italy, Luxembourg,

Netherlands, Norway, Portugal, Spain, Sweden,Switzerland, United Kingdom.


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Contents

PageForeword 21 Scope 52 Normative references 53 Definitions 54 Classification and designation 74.1 Classification 74.2 Designation 75 Manufacturing processes 75.1 Melting process and type of deoxidation 75.2 Manufacturing process of the product 76 Requirements 86.1 General 86.2 Chemical composition and weldability 106.3 Mechanical properties 106.4 Dimensions and mass 116.5 Surface geometry 116.6 Form and dimensions of fabric 137 Assessment of conformity with

the specified requirements 138 Testing 13

8.1 General 138.2 Test methods 149 Product identification 149.1 Identification of the steel 149.2 Identification of the producer 149.3 Identification of the processor of

decoiled material 159.4 Labelling of welded fabric 15Annex A (normative) Attestation ofconformity by certification 16Annex B (normative) Methods of testing

the properties of reinforcing steel 20Figure 1 Characteristics of purposemade fabric 7Figure 2 Rib geometry of steelB500A (a) and steel B500B (b) 12Figure 3 Rib flank inclination a, andrib height h 12Figure 4 Pitch of wires and overhang ofsingle wires 13Figure 5 Pitch of wires and overhang oftwin wires 13

Figure 6 Example of rib pattern of steelB500A with four transverse rib series 14

PageFigure 7 Example of rib pattern of

steel B500B with four transverse ribseries 14Figure 8 Identification of the countryand producer works 14Figure B.6 Fatigue stress cycle 21Figure B.8 Determining the area of thelongitudinal section, FR 22Table 1 Properties of reinforcing steelsB500A and B500B of various product forms 9Table 2 Chemical composition of steelsB500A and B500B 10

Table 3 Conditions of testing theproperties 10Table 4 Mandrel diameter at therebend test 10Table 5 Nominal diameters for theseveral steels and product types, nominalcross-sectional area and nominal mass 11Table 6 Projected rib areafR 12Table 7 Identification of the country oforigin 14Table A.1 List of product families 16Table A.2 Re coefficient k as a

function of a number (n) of the testresults 18Table A.3 Agt and Rm/Re coefficient kas a function of a number (n) of thetest results 18


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1 Scope

1.1 This European Prestandard specifiesrequirements for the chemical composition and themechanical and geometrical properties of weldableribbed reinforcing steel in Grade B500, categories Aand B (designated as steels B500A and B500B,see Table 1) used for the reinforcement of concretestructures in the form of

bars and coils or as elements for themanufacture of welded fabric, sheets of factory-made machine-welded fabricin the diameter ranges given in Table 1.

1.2 This European Prestandard does not apply to non-weldable reinforcing steel; plain round or indented reinforcing steel; lattice girders; prestressing steels (see EN 10138).

2 Normative references

This European Prestandard incorporates by datedor undated reference, provisions from otherpublications. These normative references are citedat the appropriate places in the text and thepublications are listed hereafter. For datedreferences, subsequent amendments to or revisions

of any of these publications apply to this EuropeanPrestandard only when incorporated in it byamendment or revision. For undated references thelatest edition of the publication referred to applies.EN 10002-1, Metallic materials Tensile testing;Part 1: Method of test (at ambient temperature).

EN 10002-2, Metallic materials Tensile testing;Part 2: Verification of the force measuring system ofthe tensile testing machine.

EN 10002-4, Metallic materials Tensile testing;Part 4: Verification of extensometers used in uniaxialtesting.

EN 10020,Definition and classification of grades ofsteel.EN 10027-1,Designation system for steels;Part 1: Steel names; principal symbols.

EN 10027-2,Designation system for steels;Part 2: Numerical system.

EN 10079,Definition of steel products.EN 29002, Quality systems; Model for qualityassurance in production and installation.

EN 45011, General criteria for certification bodiesoperating product certification.

EN 45012, General criteria for certification bodiesoperating quality system certification.

ECISS Information Circular IC 10,Designationsystems for steel; Additional symbols for steel names.

EURONORM 18, Selection and preparation ofsamples and test pieces for steel products1).

ISO 10065, Steel bars for the reinforcement ofconcrete Bend and rebend tests.

ISO 10287, Steel for the reinforcement of concrete Determination of the strength of joints in weldedfabric.

ISO 10606, Steel for the reinforcement of concrete Determination of total elongation at maximumforce2).

3 Definitions

For the purposes of this European Prestandard thefollowing definitions apply.

3.1reinforcing steel

steel with a circular or practically circular crosssection which is suitable for the reinforcement ofconcrete

3.2ribbed reinforcing steel

steel with at least two rows of transverse ribs whichare uniformly distributed over the entire length

3.3non-alloyed steel; quality steel

definitions, see EN 10020

3.4bar, rod, wire

definitions, see EN 10079

3.5decoiled material

reinforcing steel manufactured in coils and

subsequently straightened. After straightening, itmay be delivered in straight lengths or as cut andbent pieces

3.6nominal cross-sectional area

the cross-sectional area equivalent to the area of acircular plain bar of the nominal diameter

1) Until it is transformed into a European Standard either this EURONORM or the corresponding national standard may beapplied.2)At present at the stage of draft.


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3.7welded fabric

arrangement of longitudinal and transverse bars orwires of the same or different diameter and lengththat are arranged substantially at right angles toeach other and factory electrical resistance weldedtogether by automatic machines at points ofintersection

3.8characteristic value

value having a prescribed probability of not beingattained in a hypothetical unlimited test series. Inthe context of this European Prestandard thecharacteristic value is (unless otherwise indicated)

the lower limit of the one sided statistical toleranceinterval at which there is a 90 %probability (1 p a = 0,90) that 95 % (p = 0,95)or 90 % (p = 0,90) of the values are at or above thislower limit. This definition refers to the long-termquality level of productionNOTE Thep-values specified for the properties of the steelscovered by this European Prestandard are given in Table 1.

3.9longitudinal rib

uniform continuous protrusion parallel to the axis ofthe bar. In the case of cold-twisted bars the ribs areparallel before cold twisting

3.10transverse rib

any rib on the surface of the product other than alongitudinal rib

3.11rib height, h

distance from the highest point of the rib(transverse or longitudinal) to the surface of the core

3.12rib spacing, c

distance between the centres of two consecutivetransverse ribs measured parallel to the axis of thebar (see Figure 2)

3.13transverse rib inclination,

angle between the centre line of the transverse riband the longitudinal axis of the bar(see Figure 2)

3.14pitch of twist

distance between two consecutive correspondingpoints of a longitudinal rib on the same generatrix

of a twisted bar

3.15standard fabric

fabric manufactured according to national orproducers delivery conditions and available fromstock

3.16purpose made fabric

fabric manufactured according to users specificrequirements

3.17longitudinal wire

reinforcing element in the manufacturing directionof the fabric

3.18transverse wire

reinforcing element perpendicular to themanufacturing direction of the fabric

3.19twin wires

two wires of the same steel and size placedadjacently and in contact with each other as a pair

3.20pitch of fabric

centre-to-centre distance of wires in a sheet of

fabric. For twin wire fabric the pitch is measuredbetween the tangent of the adjacent wires(see Figure 4 and Figure 5)

3.21overhang

length of longitudinal or transverse wires projectingbeyond the centre of the outer crossing wire in asheet of fabric. For twin wire fabric the overhang ismeasured from the tangent line of the adjacentwires (see Figure 4 and Figure 5)

3.22length of sheet

longest side of a sheet of fabric, irrespective of themanufacturing direction

3.23width of sheet

shortest side of the sheet of fabric, irrespective of themanufacturing directionNOTE Further definitions concerning attestation of conformityand certification are given in Annex A of this EuropeanPrestandard.


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4 Classification and designation

4.1 Classification

The steels B500A and B500B are classified asnon-alloyed quality steels according to EN 10020.NOTE The reference to EN 10020 is used for the purpose ofclassification of the steels covered by the present EuropeanPrestandard and shall not be regarded as a binding requirementfor the chemical composition.

4.2 Designation

4.2.1 The steel names are allocated in accordancewith EN 10027-1 and ECISS Information CircularIC 10; the steel numbers are allocated in accordancewith EN 10027-2.4.2.2 The products covered by this European

Prestandard shall be designated in the followingsequence:a) description of the product form (e.g. bar, coil orfabric);b) the number of this European Prestandard(ENV 10080);c) the nominal dimensions of the product(see 4.2.3 and 4.2.4);d) the name and number of the steel(see Table 1).

4.2.3 In the case of bars and coils, the indications forthe nominal dimensions shall include

the nominal diameter of the product, inmillimetres; the nominal length (for bars only), inmillimetres.

Example

Bar according to this European Prestandard with anominal diameter of 20 mm and a nominal lengthof 12 000 mm of steel B500A (steel number 1.0438):

Bar ENV 10080-20x12000-B500Aor

Bar ENV 10080-20x12000-1.04384.2.4 In the case of welded fabric, the designationshall include the necessary information about thewire sizes and the geometry (dimensions, pitch,overhang, etc.) of the sheet.NOTE Brief designations are widely used to describe standardfabric (see 3.15). The relevant mesh arrangement can be seenfrom the tabulated data issued by the manufacturer.Purpose made fabric (see 3.16) can be described using theindications given in Figure 1 or by a fully dimensioned drawingand should be identified by the users reference.

5 Manufacturing processes

5.1 Melting process and type of deoxidation

The melting process and type of deoxidation of thesteel shall be at the discretion of the manufacturer.

5.2 Manufacturing process of the product

5.2.1Bars and coils

5.2.1.1 The manufacturing process shall be at thediscretion of the producer. It shall be reported to thepurchaser if requested.NOTE Examples of manufacturing methods are:

hot rolling without further treatment or hot rolling andimmediately heat treating in line or cold working (by twistingor stretching the initial hot rolled product without significantreduction of the cross-sectional area);

cold rolling or cold drawing from rod with a significantreduction of the cross-sectional area.

Figure 1 Characteristics of purpose madefabric


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5.2.1.2 Further processing (straightening, cutting tolength and eventually bending) of decoiled material

produced according to 5.2.1.1 shall only be carriedout in factories the certification of which has beenproved (see Annex A).NOTE The processor and manufacturer of coiled material haveto cooperate closely. This may include the processor submittingsamples of current processing to the steel mill to confirm that allrequirements concerning the properties of the straightenedmaterial have been fulfilled. Such a procedure does not removethe responsibility of the processor to provide material to themarket that satisfies the requirements of the present EuropeanPrestandard.

5.2.1.3 The manufacturing of reinforcing steel byre-rolling finished products (e.g. sheet or rails) shallnot be permitted.

5.2.2 Welded fabricStandard fabric shall be manufactured from wire ofthe same steel in both directions.Purpose made fabric shall be manufactured fromwire of the same steel in each direction.

The wires in one direction (longitudinal ortransverse) or in both directions may be twin wires.

All fabric shall be factory made and machinewelded. The joints at the intersections of thelongitudinal wires and the transverse wires shall bemade by electrical resistance welding to provideshear resistant connections complying with 6.3.5.Fabric including butt welded wires shall bepermitted.

6 Requirements

6.1 General

The properties of the steels B500A and B500B shallbe as specified in Table 1 for the various product

forms and nominal diameters.


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Table 1 Properties of reinforcing steels B500A and B500B of various product forms

1 Product form Bars Coils Welded fabric Type of specifiedvaluea

2 Steel (grade and category) Name B500A B500B B500A B500B B500A B500B

Number 1.0438 1.0439 1.0438 1.0439 1.0438 1.0439

3 Nominal diameterb (mm) 6 to 16 6 to 40 5 to 16 6 to 16 5 to 16 6 to 16

4 Yield strength Re (N/mm2) 500 500 500 500 500 500 Cv;p = 0,95

5 Ratio, Rm/Re 1.05 1.08 1.05c 1.08 1.05c 1.08 Cv;p = 0,90

6 Total elongation at max.forceAgt(%) 2.5 5.0 2.5d 5.0 2.5d 5.0 Cv;p = 0,90

7 Suitability for bending Table 4 Table 4 Table 4 Table 4 Table 4 Table 4

8 Fatigue strength (stressrange 2BA) (N/mm2)

180 180 180 180 100 100 Cv;p = 0,90

9 Strength of welded joints (N) 0,3 ReAe 0,3 ReAe Min.

10 Permissible deviation fromnominal mass

(%) 4,5 4,5 4,5 4,5 4,5 4,5 Max.

11 Projected rib area Table 6 Table 6 Table 6 Table 6 Table 6 Table 6 Min.

12 Chemical composition and carbonequivalent

Table 2 Table 2 Table 2 Table 2 Table 2 Table 2 Max.

a Cv: characteristic value as defined in 3.8Min.: minimum valueMax.: maximum valueb Details, see Table 5.c Rm/Re = 1,03 for d = 5,0 mm and 5,5 mm.d

Agt = 2 % for d = 5,0mm and5,5 mm.eA: nominal cross-sectional area of the wire (see 6.3.5)

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6.2 Chemical composition and weldability

6.2.1 The maximum values of the chemical

composition including the carbon equivalent valueshall be as given in Table 2.

Table 2 Chemical composition of steelsB500A and B500B

6.2.2 The carbon equivalent value Ceq shall becalculated using the following formula:

where the symbols of the chemical elements indicatetheir content in % (m/m).6.2.3 The steels shall be considered weldableprovided the values specified in Table 2 are not

exceeded. This suitability applies for example forarc welding, gas-shielded welding, flash welding,friction welding and electrical resistance welding.

6.3 Mechanical properties

6.3.1 General

The conditions of testing for which the values ofmechanical properties apply shall be as given inTable 3.Table 3 Conditions of testing the properties

6.3.2 Tensile properties

6.3.2.1 The tensile properties shall comply with the

requirements of Table 1.6.3.2.2 The values Re and Rm shall be calculatedusing the nominal cross section of the products.6.3.2.3 For the yield strength specified in Table 1,the upper yield strength (ReH) shall apply.If a yield phenomenon is not present, the 0.2 % proofstrength (Rp0,2) or the proof strength for a totalextension of 0.5 % (Rt0,5) shall be determined.In cases of dispute, the 0,2 % proof strength (Rp0,2)shall apply.

6.3.3 Suitability for bending

The suitability for bending is determined by thebehaviour of the products in the rebend test.The test pieces are bent through approximately 90over a mandrel having a diameter in accordancewith Table 4, aged and then bent back by atleast 20 (see B.5).After the test, the specimen shall show no fractureor cracks.Table 4 Mandrel diameter at the rebend test

6.3.4 Fatigue strength

Submitted to axial force controlled fatigue testing inthe fluctuating tension range, the product shallwithstand at least 2 106 stress cycles at aspecified range of stress 2BA fluctuating down froma maximum stress Bmax. = 300 N/mm

2(0,6 Re,nominal).The values for 2BA are given in Table 1

(see also B.6).6.3.5 Strength of welded joints

For welded intersections in fabric, the shearing loadrequired to produce failure of the weld shall be notless than 0,3 ReA, where Re is the specifiedcharacteristic yield strength (500 N/mm2) andA (in square millimetres) is the nominalcross-sectional area of either

a) the larger wire at the joint in a single wirefabric;b) one of the twin wires in a twin wire fabric (twinwires in one direction);c) one of the wires with the larger diameter in thecase of fabric with twin wires in both directions.

Type ofanalysis

Chemical composition

% max.

C P S Na Carbonequivalent

value

CastanalysisProduct

analysis

0,22

0,24

0,050

0,055

0,050

0,055

0,012

0,013

0,50

0,52

a Higher nitrogen contents are permissible if sufficientquantities of nitrogen binding elements are present.

Manufacturing and deliverycondition of the product

Condition oftesting

(test pieces)

1

2

3

4

5

Produced in straight lengthsby hot rollingProduced in straight lengthsby cold workingProduced as coil and deliveredin straight lengthsProduced and delivered as coil

Welded fabric

As deliveredaor agedb

Agedb

Agedb

Straightenedand agedb

Agedbc

aAged in cases of dispute.bAgeing means: heating of the test specimen to 100 C,maintaining it at this temperature for a period of minimum 1 h

and then cooling it in still air at room temperature. The methodof heating is left to the discretion of the producer.c Or as delivered when produced from material according toline 1.

Ceq CMn6

--------- Cr Mo V+ +5

--------------------------------- Ni Cu+15

---------------------+ + +=

Nominal diameter d

mmMandrel diameter

dk 1212 < dk 1616 < dk 2525 < dk 40

5 d6 d8 d

10 d


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6.4 Dimensions and mass

6.4.1Diameters, cross-sectional area

The values for the nominal diameter related to eachsteel and product type and the values for thenominal cross-sectional area are given in Table 5.

6.4.2Mass

6.4.2.1 The values for the nominal mass given inTable 5 have been calculated from the values for thenominal cross-sectional area using a density valueof 7,85 kg/dm3.6.4.2.2 The permissible deviation from nominalmass shall be + 4,5 % (see Table 1).

6.4.3 Length of bars

6.4.3.1 The nominal length of bars shall be agreed atthe time of enquiry and order. The preferred valueis 12 m.

6.4.3.2 The permissible deviation from the nominallength shall be 0/+ 100 mm. Other tolerances may

be agreed at the time of enquiry and order.6.4.4 Coil size

The size of the coils shall be agreed at the time ofenquiry and order.

6.5 Surface geometry

6.5.1 General

The steel products covered by this EuropeanPrestandard are characterized by their surfacegeometry (dimensions, number and configuration oftransverse and longitudinal ribs) by means of which

bond with the concrete is achieved,

the steels B500A and B500B are identified(see clause 9).

Table 5 Nominal diameters for the several steels and product types, nominal cross-sectionalarea and nominal mass

Nominaldiameter

Product type and steel Nominal cross-sectionalarea

Nominal mass

Bars Coils Fabric

mm B500A B500B B500A B500B B500A B500B mm2 kg/m

5,05,56,0

6,57,07,58,08,59,09,5

10,010,511,011,512,014,016,020,025,028,0a

32,040,0

x

x

x

xxx

x

x

x

xxxxxxxx

xxb

x

xbxxb

xxb

xxb

xxb

xxb

xxx

x

xb

x

xb

x

xb

xxx

xxx

xxxxxxxxxxxxxx

x

x

x

x

x

x

xxx

19,623,828,3

33,238,544,250,356,763,370,978,586,695,0

103113154201314491616804

1 256

0,1541,1870,222

0,2600,3020,3470,3950,4450,4990,5560,6170,6800,7460,8150,8881,211,582,473,854,836,319,86

a Non-preferred diameter.b Only for manufacturing welded fabric.


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6.5.2Projected rib area

The projected rib areafR shall be regarded as the

ruling criterion for the bond performance of theproducts. The requirements forfR as a function ofthe nominal diameter are given in Table 6.

Table 6 Projected rib areafR

6.5.3 Geometry of ribs

6.5.3.1 General

The products shall have two or more rows of paralleltransverse ribs equally distributed around theperimeter with a uniform spacing over the entirelength. Longitudinal ribs may be present or not.

Minor deviations from the values given in 6.5.3.2and 6.5.3.3 are permitted provided that the

specifications for the projected rib area according toTable 6 are satisfied.

6.5.3.2 Transverse ribs

6.5.3.2.1 The transverse ribs shall have a crescentshape and shall merge smoothly into the core of theproduct (unless the same product properties can beachieved by other special surface configurations).6.5.3.2.2 The projection of the transverse ribs shallextend over approximately 80 % of the periphery ofthe product which shall be calculated from thenominal diameter.6.5.3.2.3 The rib flank inclination a shall beU 45;

the ribs shall be radiused at the transition to thecore of the product (see Figure 3).6.5.3.2.4 The angle of rib inclination should be 35to 75 (see Figure 2).6.5.3.2.5 The height h shall be 0,05d to 0,10d; thespacing c shall be 0,5d to 1,0d (d: nominal diameter)(see Figure 2 and Figure 3).

Nominal diameter

mmfR min.

5,0 to 6,06,5 to 8,59,0 to 10,5

11,0 to 40

0,0390,0450,0520,056

Figure 2 Rib geometry of steel B500A (a) and steel B500B (b)

(example with two rows of transverse ribs)

Figure 3 Rib flank inclination a, and rib height h(section A.A from Figure 2)


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6.5.3.3 Longitudinal ribs

6.5.3.3.1 Where longitudinal ribs are present, their

height shall not exceed 0,15d (d: nominal diameter).6.5.3.3.2 Cold-twisted products shall have a pitch oftwist of 8d to 12d and shall have longitudinal ribs.

6.6 Form and dimensions of fabric

6.6.1 General

Each sheet shall contain not less than the number ofwires appropriate to its specified length, width,pitch and overhang dimensions.A sheet of fabric from which not more than onesample has been removed shall not be rejected forthis reason.

6.6.2 Size of wire

Fabric shall be made from wire of the nominaldiameters indicated in Table 5.

6.6.3 Wire arrangement

The wires of a sheet shall be single wires and/ortwin wires.

6.6.4Relative diameters of wires

6.6.4.1 The diameters of wires in single wire fabricshall meet the following requirement:

dmin.U 0,6dmax.

6.6.4.2 For fabric with twin wires in one directionthe wire diameters shall meet the followingrequirement:

0,7dsUdTU 1,25ds

6.6.4.3 For twin wire fabric in both directions theindividual wire diameters shall meet the followingrequirements:

dmin.U 0.7dmax.NOTE Other requirements than given in 6.6.4.1 to 6.6.4.3 maybe agreed at the time of enquiry and order.

6.6.5Preferred pitch and overhang

The pitch a of longitudinal wires and transversewires shall be not less than 50 mm.

The overhang u should be not less than 25 mm(see Figure 4 and Figure 5).

6.6.6Dimensional tolerances

The permitted deviations for fabric are:length and width: 25 mm or 0,5 % whicheveris the greater;

wire pitch: 15 mm or 7,5 % whichever is thegreater.Special tolerance requirements may be agreedbetween the manufacturer and purchaser.

7 Assessment of conformity with thespecified requirements

Reinforcing steels according to this EuropeanPrestandard shall be subjected to a continuousquality control as described in Annex A. Theprocedure shall lead to the issue of a certificate ofapproval to the manufacturer by a certification

body.Reinforcing steels which have been produced incompliance with the requirements of this EuropeanPrestandard shall be supplied with a deliverydocument according toA.7 and a product markingaccording to clause 9.NOTE It is not necessary for the purchaser to carry outacceptance testing of the material delivered to the constructionworks if these requirements have been met.

8 Testing

8.1 General

The extent of testing reinforcing steels according tothis European Prestandard and the procedures ofevaluating the test results are specified inAnnex A.

wheredmax. is the nominal diameter of the thickestwire;

dmin. is the nominal diameter of the crossingwire.

whereds is the nominal diameter of the single

wire;dT is the nominal diameter of one of the twin

wires.

Figure 4 Pitch of wires and overhang ofsingle wires

Figure 5 Pitch of wires and overhang oftwin wires


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8.2 Test methods

Annex B to this European Prestandard describes

the test methods to be applied for the determinationof the following properties:

chemical composition (B.1); tensile properties Re and Rm (B.2and B.3); total elongation at maximumforceAgt (B.3 and B.4); suitability for bending (rebend test) (B.5); fatigue strength (B.6); rib geometry (B.7); projected rib areafR (B.8);

deviation from nominal mass (B.9); strength of joints in welded fabric (B.10).

9 Product identification

9.1 Identification of the steel

9.1.1 The steel shall be identified as follows by theproducts surface features (arrangement of thetransverse ribs).NOTE The specifications are only based upon the disposition ofthe ribs and not the number of rib series.

a) Steel B500A

Two or more series of parallel transverse ribswith the same angle of inclination and the samedirection for each series [see Figure 2 a) andFigure 6].b) Steel B500BTwo or more series of parallel transverse ribs.One (in the case of two or three rib series) or two(in the case of four rib series) of these series shallbe at a contrary angle to the others[see Figure 2 b) and Figure 7].

9.1.2 The transverse ribs in each of the series shallhave a substantially uniform spacing.

9.2 Identification of the producer

The reinforcing steel producer shall be identified bya numerical system of normal transverse ribs

between thickened transverse ribs.The symbol denoting the beginning and direction ofreading of the identification consists of twosuccessive thickened ribs.The producer is identified with two numbers ofnormal transverse ribs between thickenedtransverse ribs.

One for the country (between 1 and 9according to Table 7). One for the mill (with two digits between 11and 99 except multiples of 10). The mark for themill contains two groups of normal transverseribs (once again separated by a thickenedtransverse rib). (See example in Figure 8.)

Table 7 Identification of the country of

Figure 6 Example of rib pattern of steelB500A with four transverse rib series

Figure 7 Example of rib pattern of steelB500B with four transverse rib series

Figure 8 Identification of the country and producer worksExample Country No 4, Works No 16


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origin 9.3 Identification of the processor of decoiledmaterial

In addition to the identification mark of theproducer according to 9.2 the decoiled material shallbe provided with a durable identification mark ofthe processor.

9.4 Labelling of welded fabric

Each bundle of welded fabric shall have a labelindicating the manufacturer, the number of thisEuropean Prestandard and the reference number.

Country Number of normal

transverse ribsbetween start andnext thickened rib

Austria, GermanyBelgium, Netherlands,Luxembourg, SwitzerlandFranceItalyUK, Ireland, IcelandDenmark, Sweden, Norway,FinlandSpain, PortugalGreece

12

3456

78


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Annex A (normative)Attestation of conformity by

certification

A.1 Scope

This Annex A to ENV 10800 describes the systemfor ensuring the compliance of products covered bythis European Prestandard with the specifiedrequirements by certification.NOTE This annex is in accordance with the Council Directiveof 21 December 1988 on the approximation of laws, regulationsand administrative provisions of the Member States relating toconstruction products (89/106/EEC) (called Construction

Products Directive and designated CPD in abbreviated form inthe rest of the text) and Guidance Paper No. 7 (designated GP 7in abbreviated form in the rest of the text) from the Standing

Committee for Construction Guidelines for the Performance of theFactory Production Control for Construction Products (DocumentConstruct 91/067, February 1991).

A.2 Normative references

See clause 2 of this European Prestandard.A.3 Definitions

A.3.1certification

assessment and regular surveillance by a thirdparty certification body of the factory productioncontrol and compliance of the products with thisEuropean Prestandard using sampling and testing

of some part of the product supported by statisticalanalysisA.3.2certification body

impartial body, governmental ornon-governmental, possessing the necessarycompetence and responsibility to carry outconformity certification according to given rules ofprocedures and managementNOTE The bodies will have been designated by a Member Stateof the EU or EFTA if the CPD makes it necessary, in which casethey shall comply with Annex IV of the CPD or if not required bythe CPD they shall comply with EN 45011 or EN 45012 as

appropriate.A.3.3factory production control

the permanent internal control of productionexercised by the manufacturerNOTE This has been developed further by GP 7 which makesreference to, inter alia, the use of EN 29002. This reference toEN 29002 does not require certification to EN 29002.

A.3.4quality system

the organizational structure, responsibilities,procedures, processes and resources forimplementing quality managementNOTE 1 The quality system should only be as comprehensive asneeded to meet the quality objectives.

NOTE 2 For contractual, mandatory and assessment purposes,demonstration of the implementation of identified elements inthe system may be required.

NOTE 3 The quality system includes factory production control.A.3.5quality manual

a document setting out the general quality policies,procedures and practices of an organizationNOTE The quality manual forms part of the quality systemdocumentation.

A.3.6technical file

a document setting out manufacturing processesand methods in outline

A.3.7

provisional certification

certification for manufacture which is granted to aproducer by the certification body for a productfamily and a limited period of time after the initialassessment

A.3.8full certification

certification for manufacture which is granted to aproducer by the certification body for a productfamily after satisfactory completion of theprovisional certification

A.3.9

product family

group of related products as defined in Table A.1Table A.1 List of product families

A.3.10standard properties

those properties which are contained in thisEuropean Prestandard and form part of the routineinternal control requirements for every test unit

A.3.11independent testing

testing which is carried out by an independenttesting laboratory on samples selected by thecertification body

Number Product type Surfaceconfiguration

Steel

1 Bars Ribbed B500A

2 B500B

3 Coils Ribbed B500A

4 B500B

5 Decoiled

material

Ribbed B500A

6 B500B7 Welded fabric Ribbed B500A

8 B500B


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NOTE When agreed with the certification body, independenttesting for fatigue resistance may be carried out in the producerstesting laboratory under the supervision of the certification body.

A.3.12testing laboratory

laboratory which measures, examines, tests,calibrates or otherwise determines thecharacteristics or performance of materials orproducts

A.3.13inspection body

an impartial body having the organization, staffing,competence and integrity to perform according tospecified criteria functions such as assessing,recommending for acceptance and subsequent audit

of producers quality control operations andselection and evaluation of products on site or infactories or elsewhere, according to specific criteria

A.3.14external supervision

continuous surveillance, judgement and assessmentof factory production control under theresponsibility of a certification body which consistsof periodic inspections of the factory and of samplingand testing

A.4 Certification for production

A.4.1 General

Assessment of factory production control, whichincludes external supervision and testing, shall becarried out by a certification body acting either withits own resources or using inspection bodies ortesting laboratories authorized by it.

A.4.2 Certification procedure

Full certification for production of material meetingthe requirements of this European Prestandard isgiven for a product family with a defined diameterrange after the following steps have been taken:

a) application submitted by the producer to acertification body accompanied by a technical fileand a quality manual;b) initial assessment by the certification bodyleading to the issue of a provisional certificate forproduction. The provisional certification shalllast between 6 months and 12 months;NOTE During the period of provisional certification, thenumber of tests per test unit and the frequency of externalsupervision may be increased at the discretion of thecertification body taking into account the experience of themanufacturer.

c) transfer to full certification after thesatisfactory completion of the period ofprovisional certification.

A.4.3Maintenance of full certification

Certification for production is maintained subject

to:a) satisfactory result of external supervision,b) continuation of the production of the productfamilies in the defined diameter ranges after fullcertification was given,c) if necessary, implementation of correctiveactions on any non-compliance to meet therequirements.

A.4.4Duration of full certification

The duration of full certification shall notexceed 5 years.

A.4.5Renewal of certificateAt the end of the period of full certification, therenewal of the certification will only be subject tothe compliance with the requirements ofA.4.3.

A.5 Factory production control

A.5.1 General

Factory production control shall cover productionfrom steel melting through to the despatch of theproducts. In the event of the producer purchasing asemi-finished product as feedstock, the producershall have a procedure satisfactory to thecertification body to ensure that his supplier has a

quality system that meets the requirements of thissection.A.5.2 Sampling and testing

For the verification of the standard propertiesspecified in this European Prestandard, thefollowing sampling and testing shall be applied.

A.5.2.1Bars and coils

The test unit is the cast or part quantity of a cast.One test piece per 30 t but at least three test piecesper test unit and nominal diameter are to be taken.The chemical composition (cast analysis) shall bedetermined on each cast by the steel producer. Theanalysis shall permit the verification of thecompliance to 6.2.

A.5.2.2 Welded fabric

The test unit is the mass of sheets of a maximummass of 50 t of the same steel (or steels in the case ofpurpose-made fabric composed of different steels inthe two directions) carried out on the same weldingmachine.For the verification of the properties, four test pieces(two for the longitudinal direction, two for thetransverse direction) shall be taken from each testunit. These test pieces can be taken according to the

producers choice, either on one sheet, or on differentsheets, provided that different wires are tested.


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The chemical composition (cast analysis) shall havebeen determined by the steel producer and shall be

reported to the fabric manufacturer for each cast.A.5.2.3Decoiled material

The chemical composition (cast analysis) and thetensile properties of the material in coil shall havebeen determined by the steel producer and shall bereported to the processor for each cast.The test unit is 30 t if the material is traceable tocast and 10 t if it is not. One sample of thestraightened material shall be taken per test unit.After straightening, the surface geometry shall bechecked by the processor. Tensile tests shall becarried out for the determination of the long term

quality level.A.5.3 Evaluation of test results

A.5.3.1 The test results shall satisfy the followingrequirements:

a) The individual values of yield strength Re shallbe equal to or greater than 475 N/mm2. Theaverage values m of the test unit shall satisfy therequirement

mUCv + a (see note)

where

NOTE It is not necessary to assess the mean value m if allindividual values xlie above the specified characteristicvalue Cv.

b) In the rebend test, all test pieces shall fulfil therequirements of6.3.3.c) When testing the strength of welded joints, alltest pieces shall fulfil the requirements of6.3.5.d) When testing the projected rib areafR noindividual value shall be less than the valuesspecified in Table 6.

e) When testing the rib geometry the results shallmeet the requirements according to 6.5.3.f) When testing the mass no individual valueshall be more than 4.5 % below the nominal valuegiven in Table 5.

A.5.3.2 Test units which do not conform to therequirements shall be set aside. In these cases, afurther two samples for each failed sample shall betaken from the test unit concerned. Provided thatthe subsequent results comply with therequirements the test unit is deemed to comply withthe standard. Where test results continue to be

unsatisfactory the test unit is rejected and theproducer shall immediately take the measuresnecessary to rectify the fault.

A.5.4Determination of the long term qualitylevel

A.5.4.1 Extent of determinationIn order to determine the long term quality level theresults of tests on all part quantities of thecontinuous production are to be collated andstatistically evaluated for Re,Agt,and Rm/Re taking the greatest number of results:

either corresponding to the continuingpreceding 3 month operation or approximately 200 results.

A.5.4.2 Evaluation of the results

The evaluation is carried out per diameter for barsand coils and per group of diameters for weldedfabric (5 mm and 5,5 mm; 6 mm to 7,5 mm; 8 mmto 10,5 mm; 11 mm and over).The following requirement shall be satisfied for Re,Agt and Rm/Re:

mpksUCv

Table A.2 Re coefficient k as a function ofa number (n) of the test results [for a reliable

failure rate of 5 % (p = 0,95) at a probabilityo f 9 0 % ( 1 a = 0,90)]

Table A.3 Agt and Rm/Re coefficient k as a

function of a number (n) of the test results [for

a = 10 N/mm2 for the yield strength Re,

a = 0 for the total elongation at maximumforceAgt and the ratio Rm/Re.

wherem is the average value,s is the estimate of the standard deviation of

the population,k is the coefficient listed in Table A.2 for Re

and Table A.3 forAgt and Rm/Re.

n k n k

56789

10

11121314151617181920

3,403,092,892,752,652,57

2,502,452,402,362,332,302,272,252,232,21

304050607080

90100150200250300400500

1 000Z

2,082,011,971,931,901,89

1,871,861,821,791,781,771,751,741,711,64


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a reliable failure rate of 10 % (p = 0,90) at aprobability of 90 % (1 a = 0,90)]

The foregoing is based on the assumption that thedistribution of a large number of results is normalbut this is not a requirement. However, thefollowing alternative methods may be used toestablish conformity of the production with therequirements of this European Prestandard:

a) graphical method including control charts,b) non-parametric statistical techniques.

A.5.4.3 Reporting

The results of the long term quality levelassessment shall be made available by the producerto the responsible certification body.

A.5.5 Traceability

Delivered product batches shall be definitelyidentifiable and traceable with regard to theirproduction data. For this purpose, the manufacturershall establish and maintain the records required inthe relevant technical specification and shall markthe products or their delivery documentsaccordingly.

A.6 External supervision

A.6.1 Frequency

External supervision by the certification body willbe carried out at intervals of not more than 6months.

A.6.2 Factory production control

External supervision of factory production control is

carried out to ensure that the quality systemcontinues to function satisfactorily and that anychanges to the system have been implemented inline with the stated procedures.Partial assessments are made at each visit in orderto proceed to a complete review of the quality systemevery 2 years.

A.6.3 Sampling and testing

A.6.3.1 Standard properties

For standard properties except chemicalcomposition, duplicate tests from at least 10 bars,coils or sheets of fabric from each of three test units

with the same nominal size shall be carried out bythe producer and the certification body.These tests are carried out on one product familytaken at random. Where several product familiesare approved, the certification body carries out thesampling in such a way as to cover the largestnumber of product families in a certain period oftime.

A.6.3.2 Fatigue testing

Once a year, 5 samples are taken from differentbars, coils or sheets of welded fabric of one nominalsize.

The certification body carries out the sampling insuch a way as to cover the greatest number ofdiameters or sizes in a certain period of time.The material shall be deemed to comply with thisEuropean Prestandard if four of the five specimensendure 2 million cycles and the fifth one, 1.5 millioncycles. In the case of any failure, the test shall beconsidered invalid if it is initiated from a defectunique to the test specimen or in an area adjacent tothe testing machine grips; in this case a furthersingle test shall be carried out.If the above mentioned criteria is not fulfilled, one

further series of five specimens shall be selectedfrom the nominal size represented. If the criteria isfulfilled for this supplementary series, the materialshall be deemed to comply with this EuropeanPrestandard. If not, an investigation shall becarried out and appropriate measures shall be taken(seeA.6.3.3).

A.6.3.3 Evaluation, reporting and action

The test results for the standard properties shall bestatistically evaluated and compared with theresults from the internal testing. The results ofthese tests shall be compared using appropriatetechniques.

n k n k

56789

1011121314151617181920

2,742,492,332,222,132,072,011,971,931,901,871,841,821,801,781,77

30405060708090

100150200250300400500

1 000Z

1,661,601,561,531,511,491,481,471,431,411,401,391,371,361,341,282


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The results of external supervision shall be recordedin a supervision report which shall be produced

within a period of 4 weeks. If the results show thatthe production does not conform to therequirements, appropriate measures shall be taken.The measures will depend on the type andsignificance of the deficiencies noted but willinclude:

a) warning the producer;b) intensification of supervision (increase thefrequency of testing);c) suggestion that the conditions of production bechanged;d) withdrawal of certification.

A.7 Delivery documentation and productmarking

Reinforcing steels which have been produced incompliance with the requirements of this EuropeanPrestandard and subjected to external supervisionas described in here shall be supplied with adelivery certificate which contains the followinginformation.The number of this European Prestandard and thefollowing:

a) producer works;b) works symbol or number;

c) certification body;d) certificate number;e) product marking, where appropriate;f) nominal diameter;g) designation of the reinforcing steel;h) quantity supplied;i) date of supply;j) recipient.

A.8 Verification of characteristic values

A.8.1 In the event of sampling and testing on the

market by either purchaser or enforcement agency,and where the determination of a property specifiedin this European Prestandard as a characteristicvalue creates a dispute, the value shall be verifiedby selecting and testing three test specimens fromdifferent bars, coils or sheets in the batch.If one test result is less than the specifiedcharacteristic value, both the test specimen and thetest method shall be carefully examined. If there isa local fault in the specimen or reason to believe thatan error has occurred in the test, the test resultshall be ignored. In this case a further single testshall be carried out.

If the three valid test results are equal to or greaterthan the specified characteristic value, the batch

shall be deemed to comply with this EuropeanPrestandard.If not, the requirements ofA.8.2 apply.

A.8.2 WhenA.8.1 is not fulfilled, 10 complementaryspecimens shall be selected from different bars, coilsor sheets in the batch.The batch shall be deemed to comply with thisEuropean Prestandard, if the criterion inA.5.3.1 a)is fulfilled.If not, the batch is rejected.

Annex B (normative)

Methods of testing the properties ofreinforcing steel

B.1 Chemical composition

The methods of determination of the chemicalcomposition are left to the discretion of themanufacturer. In the case of dispute, the relevantEuropean Standards shall be applied.B.2 General requirements for thedetermination of mechanical properties

B.2.1 The tests for the determination of themechanical properties shall be carried out in the

temperature range 10 C to 35 C.B.2.2 Unless otherwise indicated, the tests for theevaluation of the mechanical properties of bars andcoils shall be carried out on straight test pieces withfull cross section without machining within thegauge length.B.2.3 In the case of fabric, the samples and testpieces shall be taken from the fabric in its deliverycondition or in the case of internal control froma trial sheet which is made to ensure that themanufacturing conditions enable the properties tobe achieved.

B.2.4 The conditions for treating the test pieces aregiven in 6.3.1 (Table 3).B.3 Tensile test

B.3.1 The tensile test shall be carried out inaccordance with EN 10002-1 taking into account theindications in 6.3.2 and B.2.B.3.2 The class of the testing machine according toEN 10002-2 shall be 1 or better.B.3.3 For the test pieces cut from bar or coil thespecifications according to B.2.2 apply.B.3.4 The test pieces taken from fabric shall includeat least one welded intersection. Transverse wires,

and the wire not under test in a twin wire sample,shall be cut off without damaging the wire undertest.


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B.4 Determination of total elongation atmaximum force

B.4.1 GeneralThe total elongation at maximum forceAgt shall bedetermined either by

direct measurement of the total elongation atthe maximum force by means of an extensometeror by direct measurement on the test piece afterfracture.

In the case of dispute the extensometer methodshall be deciding unless otherwise agreed betweenthe parties.B.4.2 Execution of the tests

The tests shall be carried out in accordance withISO 10606.NOTE The following European Standards (see also clause 2)correspond to the normative references given in ISO 10606:

EN 10002-1: ISO 6892;EN 10002-2: ISO 7500-1;EN 10002-4: ISO 9513.

B.5 Rebend test

The rebend test shall be carried out according toISO 10065.

Clause 6.6.3 of the present European Prestandardapplies for the angle of bending and rebending and

the mandrel diameter.B.6 Fatigue testing

B.6.1 General

Clause B.6 specifies some principles of the fatiguetesting of ribbed reinforcing steel. The test shall becarried out in air as an axial force controlled test inthe fluctuating tension range (see Figure B.6).B.6.2 Test pieces

a) In the case of bars and coils, straight test pieceswithout reduction of section by machining shallbe tested (see B.2.2).b) In the case of welded fabric the test piece shallcontain at least one welded intersection withinthe gauge length. The thicker wire shall betested.

B.6.3 Test method

The test shall be carried out in a pulsator under loadcontrol. The frequency of cycles shall be 1 Hzto 200 Hz.The test shall be continued until 2 106 stresscycles have been completed or the test piece fails(see 6.3.4).

Figure B.6 Fatigue stress cycle


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B.7 Measurement of rib geometry

B.7.1Height of transverse ribs

The height of transverse ribs (h) shall be measuredwith an instrument of an accuracy of 0,01 mm foreach row of ribs at the point where the rib height isgreatest (see 3.11).B.7.2 Spacing of transverse ribs

The spacing of the transverse ribs (c) shall bedetermined from the length of the measuringdistance divided by the number of the rib gaps inbetween.The measuring distance is deemed to be the intervalbetween the centre of a rib and the centre of anotherrib on the same side of the product determined in a

straight line and parallel to the longitudinal axis ofthe product. The length of the measuring distanceshall be

at least 10 rib gaps for non-twisted products, one pitch length for cold-twisted products.

B.8 Calculation of the projected rib areafR

B.8.1 The projected rib areafR of ribbed reinforcingsteel is defined by the following formula:

The second summand applies only for cold-twistedbars and shall only be taken into account up to a

value of 30 % of the total value offR.In this formula

is the area of longitudinal section of a rib(see Figure B.8);

hs is the average height of any portion of atransverse rib of length %l subdivided intopsegments;

is the angle of inclination of the ribs to thebar axis, in (degrees);

d is the nominal size of the bar, in mm;c is the spacing of the transverse ribs, in mm;k is the number of rows of transverse ribs on

the circumference;m is the number of transverse rib inclinations

per row;i is the number of longitudinal ribs;h1 is the height of the longitudinal ribs, in mm;

jd is the pitch for cold-twisted bars (j = 8 to 12,see 6.5.3.3.2);

.. (n); (n, l) are variables.

Figure B.8 Determining the area of the longitudinal section, FR


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B.8.2 For internal control by the producer,fR maybe calculated using the following approximation

formula (which is only applicable for non-twistedbars):fR = h/c

B.9 Determination of the deviation fromnominal mass

The percentage deviation from nominal mass shallbe determined from the difference between theactual mass of the test piece as weighed and itsnominal mass according to Table 5.

The length of the test piece shall be at least 400 mm.The length shall be measured to the nearest 1 mm

and the actual mass shall be determined ingrammes with an accuracy of three digits.NOTE The determination may be carried out with tensile testpieces with a lengthU 20d, minimum 200 mm. For fabric, thecrossing wire(s) should be carefully cut before weighing.

B.10 Determination of strength of joints inwelded fabric

The test shall be carried out according to ISO 10287.NOTE EN 10002-2 (see clause 2) corresponds to ISO 7500-1referred to in ISO 10287.

where is a constant which shall be determined by

the producer on the basis of the formulagiven in B.8.1 and which has to be confirmedby the certification body according toA.3.2;

h is the maximum height of the transverse ribs(see 3.11);

c is the rib spacing (see 3.12).


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List of references

See national foreword.


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