pren 10138-3：2000 prestressing steels part 3：strand

5/28/2018 prEN 10138-32000 Prestressing steels Part 3STRAND

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EUROPEAN STANDARD

NORME EUROPENNE

EUROPISCHE NORM

DRAFTprEN 10138-3

September 2000

ICS 77.140.65

English version

Prestressing steels - Part 3: Strand

Armatures de prcontrainte - Partie 3: Torons Spannsthle - Teil 3: Litze

This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee ECISS/TC 19.

If this draft becomes a European Standard, CEN members are bound to comply with the CEN/CENELEC Internal Regulations whichstipulate the conditions for giving this European Standard the status of a national standard without any alteration.

This draft European Standard was established by CEN in three official versions (English, French, German). A version in any other languagemade by translation under the responsibility of a CEN member into its own language and notified to the Central Secretariat has the samestatus as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece,Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom.

Warning: This document is not a European Standard. It is distributed for review and comments. It is subject to change without notice andshall not be referred to as a European Standard.

EUROPEAN COMMITTEE FOR STANDARDIZATION

C O M I T E U R O P E N D E N O R M A L I S A T I O N

EUROPISCHES KOMITEE FR NORMUNG

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

2000 CEN All rights of exploitation in any form and by any means reservedworldwide for CEN national Members.

Ref. No. prEN 10138-3:2000 E

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Contents Page

1 Scope.......................................................................................................................................42 Normative references.............................................................................................................4

3 Terms and definitions............................................................................................................5

4 Designation.............................................................................................................................5

5 Manufacture............................................................................................................................6

6 Requirements .........................................................................................................................8

7 Evaluation of conformity.......................................................................................................10

8 Test methods..........................................................................................................................12

9 Delivery conditions ................................................................................................................12

Annex A (informative) Note on classes of convenience................................................................13

Annex B (informative) Note on new higher tensile strand sizes for future development ..........14

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Foreword

This Part of this European Standard has been prepared by SC2 'Prestressing steels' of the Technical

Committee ECISS/TC 19 'Concrete reinforcing and prestressing steels - Properties, dimensions,tolerances and specific tests' of which the Secretariat is held by BSI.

This European Standard has been prepared under mandate M115 given to CEN by the EuropeanCommission and the European Free Trade Association and supports essential requirements of theEU Construction Products Directive (89/106/EEC).

For relationship with the EU Construction Products Directive, see informative annex ZA, which is anintegral part of Part 1 of this European Standard and by which it becomes a harmonized EuropeanStandard.

EN 10138 is published in four parts, the other parts being:

EN 10138-1, Prestressing steels Part 1: General requirements

EN 10138-2, Prestressing steels Part 2: Wire

EN 10138-4, Prestressing steels Part 4: Bars

All products placed on the market within the European Union and EFTA must be certificated inaccordance with annex ZA of Part 1 of this European Standard.

In accordance with the common rules of CEN/CENELEC the following member countries are obligedto adopt this standard: Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany,Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden,

Switzerland, United Kingdom.


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Page 4prEN 10138-3:2000

1 Scope

This Part of this European Standard gives specific requirements for high tensile steel wire strandwhich has been given a stress relieving heat treatment.

It is applicable to strands of the following types:

a) 3-wire strand;

b) indented 3-wire strand;

c) 7-wire strand;

d) indented 7-wire strand;

e) 7-wire compacted strand.

NOTE General requirements are given in Part 1 of this European Standard.

2 Normative references

The following normative documents contain provisions which, through reference in this text, constituteprovisions of this European Standard. For dated references, subsequent amendments to, or revisions of,any of these publications do not apply. However, parties to agreements based on this EuropeanStandard are encouraged to investigate the possibility of applying the most recent editions of thenormative documents indicated below. For undated references, the latest editions of the normativedocument referred to applies. Members of CEN/CENELEC maintain registers of currently valid EuropeanStandards.

EN 10016-4, Non-alloy rod for drawing and/or cold rolling Part 4: Specific requirements for rod forspecial applications

EN 10027-1, Designation system for steels Part 1: Steel names, principal symbols

EN 10027-2, Designation system for steels Part 2: Steel numbers

prEN 10138-1, Prestressing steels Part 1: General requirements

CR 10260, Designation system for steel Additional symbols

prEN ISO 15630-3, Steel for the reinforcement and prestressing of concrete Test methods Part 3: Prestressing steels


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3 Terms and definitions

For the purposes of this Part of this European Standard the terms and definitions given inprEN 10183-1 and the following apply.

3.1unit of productproduct of one coil as delivered to the customer

3.2test unitunits of product coming from one set of coils in the stranding machine

4 Designation

4.1 For the steel grades covered by this Part of this European Standard the steel names shall beallocated in accordance with EN 10027-1 and CR 10260; the steel numbers shall be allocated inaccordance with EN 10027-2.

4.2 The designation shall consist of:

a) the number of this Part of this European Standard;

b) the steel name consisting of:

1) the letter Y for prestressing steel;

2) the nominal tensile strength in MPa;

3) the letter S for strand;

4) the number 3 or 7 to indicate the number of wires in the strand;

5) where appropriate, the letter G to indicate compacted strand;

c) the nominal diameter of the strand in mm;

d) Class A or B;

e) where necessary the letter I to indicate indented.


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Page 6prEN 10138-3:2000

Example

EN 10138-3 Y 1860 S 7 16,0 A

Number of this Part ofthis European Standard

Prestressing steel

Nominal tensilestrength (MPa)

Strand

Number of wires

Nominal diameter (mm)

Class

i.e. EN 10138-3-Y1860S7-16,0-A

NOTE The steel number may be used instead of the steel name i.e. EN 10138-3-1.1366-16,0-A.

5 Manufacture

5.1 General

The strand shall be manufactured from wire produced from wire rod conforming to EN 10016-4 andfrom steel in accordance with prEN 10138-1:2000, 6.1.

5.2 Stranding process

5.2.1 3-wire strand

The strand shall consist of three wires of the same nominal diameter, spun together in helical formover a theoretical common axis with a lay length of 14 to 22 times the nominal strand diameter.

5.2.2 7-wire strand

The diameter of the straight central wire shall be at least 2,0 % greater than the diameter of the outerhelical wires. The latter shall be tightly spun around the centre wire with a lay length of between 14and 18 times the nominal strand diameter.


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5.2.3 7-wire compacted strand

When stranding and compacting are carried out simultaneously, the straight central wire shall be atleast the same diameter as the outer helical wires. The latter shall have a lay length of 14 to 18 times

the nominal strand diameter.

5.3 Welds

The normal production lengths may contain welds made in the individual wires before drawing, butshall not contain any welds made during or after drawing.

5.4 Indented strand

The indented wires of 3-wire strand or the indented outer wires of 7-wire strand shall be indentedbefore stranding.

NOTE 1 The centre wire of 7-wire strand is normally plain.

The dimensions of the indentation shall be in accordance with Table 1 and Figure 1 of this Part of thisEuropean Standard. One line of indentations shall be at a contrary angle to the others.

NOTE 2 Alternative methods may be used to improve the bond between strand and concrete.

Table 1 Specified indentation

Dimensions in mm

Nominal

stranddiameter

Nominal

depth

Depth

tolerance

Length Pitch

d A l c

12 0,06 + 0,03 3,5 0,5 5,5 0,5

> 12 0,07 + 0,03 3,5 0,5 5,5 0,5

Figure 1 Indentation


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6 Requirements

6.1 General

Nominal and specified properties shall be in accordance with Tables 2 and 3 in this Part of thisEuropean Standard.

6.2 Behaviour during cutting

When the strand is cut, the individual wires either shall not unravel or shall be capable of beingrepositioned without difficulty.

6.3 Maximum bow height

When a length of 3-wire or 7-wire strand is lying free on a flat surface, the maximum bow height froma base line 1 m in length, measured to the inside of the curve, shall be not greater than 25 mm.


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prEN

10138-3:2000

Table2D

imensionsandpropertiesofstrands

Class

Steeldesignation

Nominala

Specified

Steelname

Steel

Diamet

er

Tensile

Cross-

Massc

Permitted

Characteristic

Maximumvalueo

f

Characteristic

Number

strength

sectionalareac

deviationonon

valueof

maximumforce

valueof0,1%

d

Rm

bf

Sn

M

nominalmass

maximumforceFm

Fm,max

proofforce

dFp0,1

Mm

MPa

mm

2

g/m

%

kN

kN

kN

A

Y1960S3

1.1

361

52

1960

136

106

2

267

305

229

Y1860S3

1.1

360

65

1860

211

165

2

392

449

338

68

234

183

435

498

374

75

290

226

540

617

464

Y1860S7

1.1

366

70

1860

30

234

2

56

65

48

90

50

390

93

106

80

110

75

586

140

160

120

125

93

726

173

198

149

130

100

781

186

213

160

152

140

1095

260

298

224

160

150

1170

279

319

240

Y1770S7

1.1

365

152

1770

140

1095

248

282

213

160

150

1170

265

302

228

180

200

1560

2

354

403

304

Y1860S7G

1.1

372

127

1860

112

875

2

209

238

180

Y1820S7G

1.1

371

152

1820

165

1290

2

300

342

258

Y1700S7G

1.1

370

180

1700

223

1740

2

380

436

327

B

Y2160S3e

52

2160

136

106

2

294

337

262

Y2060S3e

1.1

362

52

2060

136

106

2

280

321

241

Y1960S3e

1.1

361

65

1960

211

165

2

414

473

356

Y2160S7e

685

2160

282

220

2

609

697

524

Y2060S7e

1.1

368

70

2060

30

234

2

620

710

530

Y1960S7

1.1

367

90

1960

50

390

2

98

112

84

aT

henominalmodulusofelasticitymaybetakentobe195GPa(kN/mm

2).

bT

henominaltensilestrengthiscalculatedfromthenominalcrosssectionalareaandthespecifiedcharacteristicmaximum

force,roun

dedtothenearest10MPa.

cT

hecro

ss-sectionalareaiscalculatedfrom

theno

minalmassandadensityof7,8

1kg/dm

3.

dThespe

cifiedcharacteristic0.1

%p

roofforceisapproximately86%o

fthespecifiedcharacteristicmaximum

force.

e3

-wires

trandandthe7-wirestrandofdiameter6,8

5mm

and7,0mm

arenormallyonlyusedforprestressingwithdirectbond.

f 1MPa=

1N/mm

2.


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Table 3 Additional requirements for strand

Property Specification

Minimum elongation at maximum force ,Agt,with Lo500 mm 3,5 %

Reduction in area at break Ductile wire breaks visible to the unaided eye

For initial forcecorresponding to

70 % Fm 2,5 %aMaximum relaxation at 1 000 h

a,b

80 % Fm 4,5 %b

plain wire 190 MPa cFatigue load range Fr with upperlimit Fupaccording to 70 % actual

max. force

indented wire 170 MPa c

Stress corrosion testing withNH4SCN

Minimum Median

Steel in class A 2,0 h 5 h

Steel in class B 1,5 h 4 h

Maximum D-value of deflected tensile testapplies to 7-wire strand with a nominaldiameter > 12,5 mm and compacted strandonly

28 % b

aFor specific applications the relaxation requirement may be varied by agreement between supplier and purchaser.bThe requirement for 70% Fmis mandatory. Values for 80% Fmmay be agreed between supplier and purchaser.c1 MPa = 1 N/mm2.

7 Evaluation of conformity

7.1 Factory production control

7.1.1 General

The requirements in prEN 10138-1:2000, 7.1.1 shall be met.


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7.1.2 Sampling and testing of finished products

7.1.2.1 Frequency of sampling and testing

The manufacturer shall sample and test in accordance with Table 4.

Table 4 Frequency of sampling and testing forfactory production control of strand

Characteristic Sampling plan

Mass per m (Cross sectional area)

Maximum force 0,1 % proof force

Reduction in area 1 per test unit

Elongation at maximum force

Indentation depth (only for indented wire strand)

Straightness

Special properties Frequency specified inprEN 10138-1:2000, 7.1.2.2

7.1.2.2 Evaluation of test results of a test unit

A test unit shall be deemed to conform to the requirements of this Part of this European Standard if allthe results are greater than or equal to the specified value for the mechanical properties (exceptmaximum value of maximum force) and within the tolerances for the maximum force and thegeometrical properties.

If this condition is not met, the following procedure shall be applied :

1) when the result for the maximum force or 0,1 % proof force is lower than the specified value, twoadditional samples shall be taken from two units of product of the same test unit other than the oneinitially tested.

These samples shall be submitted to tensile tests. The mean value of the three individual results shallbe calculated.

The test unit shall be deemed to conform to the requirements of this Part of this European Standard ifthis mean value is greater than or equal to the specified value.

Otherwise, the test unit shall be rejected and the manufacturer shall immediately take the measures torectify the fault.


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Page 12prEN 10138-3:2000

2) when results for properties specified by a minimum and/or a maximum value do not conform to therequirements, two additional samples shall be taken from the test unit concerned by each failed result.

If the two additional results conform to the requirements, the unit of product shall be deemed to

comply with the requirements of this Part of this European Standard and no further check is needed.

If at least one of the two additional results does not conform to the specifications, the concerned unitof product shall be rejected and all the units of product from the test unit shall be tested for thedefective property(ies).

All units of product with non conforming results shall be rejected and the manufacturer shallimmediately take the measures to rectify the fault.

7.1.2.3 Assessment of long term quality level

The requirements in prEN 10138-1:2000, 7.1.2.2 shall be met.

7.2 Initial type testing

The requirements in prEN 10138-1:2000, 7.2 shall be met.

7.3 Continuous surveillance


8 Test methods

The test methods shall be in accordance with prEN ISO 15630-3.

9 Delivery conditions

9.1 Identification


9.2 Delivery documentation


9.3 Dimensions of unit of product

The dimensions of the unit of product shall be agreed at the time of ordering between the purchaserand the producer consistent with the restrictions in prEN 10138-1:2000, 9.3. The producer shall statethe coil dimensions.

9.4 Packaging and handling

The internal diameter of the coil shall be not less than 50 times the strand diameter of 7-wire strand,or 75 times the strand diameter of 3-wire strand.


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Annex A(informative)

Note on classes of convenience

Table 2 of this Part of this European Standard gives examples of classes of convenience of productsmanufactured by various countries within the EU. Other sizes not contained in this table may beoffered for approval under the CPD provided that volume manufacture of these sizes already existswithin an EU country and the general rules as indicated in notes a to f of Table 2 of this Part of thisEuropean Standard are applied. The properties and special properties of these additional sizes orclasses of convenience shall be consistent with those required for nominated classes and size rangesin Tables 2 and 3 of this Part of this European Standard.


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Annex B(informative)

Note on new higher tensile strand sizes for future development

It is apparent that new higher tensile ranges are currently under development by a number ofmanufacturers. It is proposed that these may be included as non aligned parts in this Part of thisEuropean Standard with the intention of their inclusion as fully integrated parts with full technicalapproval in future issues of the standard. For formulation of the new product properties the generalrules as indicated in notes a to f of Table 2 of this Part of this European Standard are applied. Theproperties and special properties of these additional new sizes in classes of convenience shall beconsistent with the properties required for existing nominated classes and size ranges in Tables 2 and3 of this Part of this European standard.

pren 10138-3：2000 prestressing steels part 3：strand

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