prEN 10138-3：2000 Prestressing steels Part 3：Strand

DRAFT prEN 10138-3

EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM

September 2000

ICS 77.140.65

English version

Prestressing steels - Part 3: Strand Armatures de précontrainte - Partie 3: Torons

Spannstähle - 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 which stipulate 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 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, 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 and shall not be referred to as a European Standard.

EUROPEAN COMMITTEE FOR STANDARDIZATION COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG

Central Secretariat: rue de Stassart, 36

© 2000 CEN

All rights of exploitation in any form and by any means reserved worldwide for CEN national Members.

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B-1050 Brussels

Ref. No. prEN 10138-3:2000 E

Page 2 prEN 10138-3:2000

Contents

Page

1

Scope.......................................................................................................................................4

2

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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Page 3 prEN 10138-3:2000

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 European Commission and the European Free Trade Association and supports essential requirements of the EU Construction Products Directive (89/106/EEC). For relationship with the EU Construction Products Directive, see informative annex ZA, which is an integral part of Part 1 of this European Standard and by which it becomes a harmonized European Standard. 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 in accordance with annex ZA of Part 1 of this European Standard. In accordance with the common rules of CEN/CENELEC the following member countries are obliged to adopt this standard: Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland, United Kingdom.

Page 4 prEN 10138-3:2000

1

Scope

This Part of this European Standard gives specific requirements for high tensile steel wire strand which 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

2

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

Normative references

The following normative documents contain provisions which, through reference in this text, constitute provisions 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 European Standard are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest editions of the normative document referred to applies. Members of CEN/CENELEC maintain registers of currently valid European Standards.

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

Page 5 prEN 10138-3:2000

3

Terms and definitions

For the purposes of this Part of this European Standard the terms and definitions given in prEN 10183-1 and the following apply. 3.1 unit of product product of one coil as delivered to the customer 3.2 test unit units 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 be allocated in accordance with EN 10027-1 and CR 10260; the steel numbers shall be allocated in accordance 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.

Page 6 prEN 10138-3:2000

Example EN 10138-3

Y

1860

S

7

16,0

A

Number of this Part of this European Standard Prestressing steel Nominal tensile strength (MPa) Strand Number of wires Nominal diameter (mm) Class i.e. EN 10138-3-Y1860S7-16,0-A NOTE

5

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

Manufacture

5.1 General The strand shall be manufactured from wire produced from wire rod conforming to EN 10016-4 and from 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 form over 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 outer helical wires. The latter shall be tightly spun around the centre wire with a lay length of between 14 and 18 times the nominal strand diameter.

Page 7 prEN 10138-3:2000

5.2.3

7-wire compacted strand

When stranding and compacting are carried out simultaneously, the straight central wire shall be at least 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, but shall 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 indented before 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 this European 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 strand diameter

Nominal depth

d

A


12

0,06

> 12

0,07

Depth tolerance

Length

Pitch

l

c

+ 0,03

3,5 ± 0,5

5,5 ± 0,5

+ 0,03

3,5 ± 0,5

5,5 ± 0,5

Figure 1 — Indentation

Page 8 prEN 10138-3:2000

6

Requirements

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

6.2 Behaviour during cutting When the strand is cut, the individual wires either shall not unravel or shall be capable of being repositioned 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 from a base line 1 m in length, measured to the inside of the curve, shall be not greater than 25 mm.

1.1365

1.1372 1.1371 1.1370

Y1770S7

Y1860S7G Y1820S7G Y1700S7G e Y2160S3

Y2060S3 e Y1960S3 e Y2160S7 e Y2060S7 Y1960S7

1.1368 1.1367

1.1361

1.1362

1.1366

Y1860S7

e

1.1361 1.1360

Y1960S3 Y1860S3

Number

Steel designation Steel name Steel

5,2 6,5 6,8 7,5 7,0 9,0 11,0 12,5 13,0 15,2 16,0 15,2 16,0 18,0 12,7 15,2 18,0 5,2 5,2 6,5 6,85 7,0 9,0

d Mm

Diameter

1860 1820 1700 2160 2060 1960 2160 2060 1960

1770

1860

1960 1860

Rm b f MPa

2

13,6 21,1 23,4 29,0 30 50 75 93 100 140 150 140 150 200 112 165 223 13,6 13,6 21,1 28,2 30 50

Sn 2 mm

Nominal a CrossTensile sectional area c strength

106 165 183 226 234 390 586 726 781 1095 1170 1095 1170 1560 875 1290 1740 106 106 165 220 234 390

M g/m

Mass c

±2 ±2 ±2 ±2 ±2 ±2 ±2 ±2 ±2

±2

±2

±2 ±2

Permitted deviation on on nominal mass %

Table 2 — Dimensions and properties of strands

26,7 39,2 43,5 54,0 56 93 140 173 186 260 279 248 265 354 209 300 380 29,4 28,0 41,4 60,9 62,0 98

kN

b

30,5 44,9 49,8 61,7 65 106 160 198 213 298 319 282 302 403 238 342 436 33,7 32,1 47,3 69,7 71,0 112

kN

Specified Characteristic Maximum value of value of maximum force maximum force Fm Fm, max

The nominal modulus of elasticity may be taken to be 195 GPa (kN/mm ). The nominal tensile strength is calculated from the nominal cross sectional area and the specified characteristic maximum force, rounded to the nearest 10 MPa. c 3 The cross-sectional area is calculated from the nominal mass and a density of 7,81 kg/dm . d The specified characteristic 0.1 % proof force is approximately 86 % of the specified characteristic maximum force. e 3-wire strand and the 7-wire strand of diameter 6,85 mm and 7,0 mm are normally only used for prestressing with direct bond. f 2 1 MPa = 1 N/mm .

a

B

A

Class

22,9 33,8 37,4 46,4 48 80 120 149 160 224 240 213 228 304 180 258 327 26,2 24,1 35,6 52,4 53,0 84

kN

Characteristic value of 0,1 % proof force d Fp0,1

Page 9 prEN 10138-3:2000

Page 10 prEN 10138-3:2000

Table 3 — Additional requirements for strand Property

Specification

Minimum elongation at maximum force ,Agt, with Lo
500 mm Reduction in area at break

Ductile wire breaks visible to the unaided eye

Maximum relaxation at 1 000 h

a,b

For initial force corresponding to

Fatigue load range Fr with upper limit Fup according to 70 % actual max. force Stress corrosion NH4SCN

testing

3,5 %

70 % Fm

2,5 %

a

80 % Fm

4,5 %

b

plain wire

190 MPa

c

indented wire

170 MPa

c

Minimum

Median

Steel in class A

2,0 h

5h

Steel in class B

1,5 h

4h

with

Maximum D-value of deflected tensile test applies to 7-wire strand with a nominal diameter > 12,5 mm and compacted strand only

28 %

b

a

For specific applications the relaxation requirement may be varied by agreement between supplier and purchaser.

b

The requirement for 70% Fm is mandatory. Values for 80% Fm may be agreed between supplier and purchaser.

c

1 MPa = 1 N/mm .

7

2

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.

Page 11 prEN 10138-3:2000

7.1.2 7.1.2.1

Sampling and testing of finished products Frequency of sampling and testing

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

Table 4 — Frequency of sampling and testing for factory 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

7.1.2.2

Frequency specified in prEN 10138-1:2000, 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 all the results are greater than or equal to the specified value for the mechanical properties (except maximum value of maximum force) and within the tolerances for the maximum force and the geometrical 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, two additional samples shall be taken from two units of product of the same test unit other than the one initially tested. These samples shall be submitted to tensile tests. The mean value of the three individual results shall be calculated. The test unit shall be deemed to conform to the requirements of this Part of this European Standard if this 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 to rectify the fault.

Page 12 prEN 10138-3:2000

2) when results for properties specified by a minimum and/or a maximum value do not conform to the requirements, 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 unit of product shall be rejected and all the units of product from the test unit shall be tested for the defective property(ies). All units of product with non conforming results shall be rejected and the manufacturer shall immediately 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

The requirements in prEN 10138-1:2000, 7.3 shall be met.

8

Test methods

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

9 9.1

Delivery conditions Identification

The requirements in prEN 10138-1:2000, 9.1 shall be met.

9.2

Delivery documentation

The requirements in prEN 10138-1:2000, 9.2 shall be met.

9.3

Dimensions of unit of product

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

Page 13 prEN 10138-3:2000

Annex A (informative) Note on classes of convenience

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

Page 14 prEN 10138-3:2000

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 of manufacturers. It is proposed that these may be included as non aligned parts in this Part of this European Standard with the intention of their inclusion as fully integrated parts with full technical approval in future issues of the standard. For formulation of the new product properties the general rules as indicated in notes a to f of Table 2 of this Part of this European Standard are applied. The properties and special properties of these additional new sizes in classes of convenience shall be consistent with the properties required for existing nominated classes and size ranges in Tables 2 and 3 of this Part of this European standard.