pren 10138-3%ef%bc%9a2000 prestressing steels part 3%ef%bc%9astrand
TRANSCRIPT
EUROPEAN STANDARD
NORME EUROPÉENNE
EUROPÄISCHE NORM
DRAFTprEN 10138-3
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 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 STANDARDIZATIONC O M I T É E U R O P É E N D E N O R M A LI S A T I O NEUR OP ÄIS C HES KOM ITEE FÜR NOR M UNG
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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Page 2prEN 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 3prEN 10138-3:2000
Foreword
This Part of this European Standard has been prepared by SC2 'Prestressing steels' of the TechnicalCommittee 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.
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
Page 5prEN 10138-3:2000
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.
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.
Page 7prEN 10138-3:2000
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 timesthe 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
Nominalstrand
diameter
Nominaldepth
Depthtolerance
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
Page 8prEN 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 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.
Pag
e 9
prE
N 1
0138
-3:2
000
Tab
le 2
— D
imen
sio
ns
and
pro
per
ties
of
stra
nd
sC
lass
Ste
el d
esig
nat
ion
No
min
al a
Sp
ecif
ied
Ste
el n
ame
Ste
elD
iam
eter
Ten
sile
Cro
ss-
Mas
s c
Per
mit
ted
Ch
arac
teri
stic
Max
imu
m v
alu
e o
fC
har
acte
rist
icN
um
ber
stre
ng
thse
ctio
nal
are
a c
dev
iati
on
on
on
valu
e o
fm
axim
um
fo
rce
valu
e o
f 0,
1 %
dR
m b
fS
nM
no
min
al m
ass
max
imu
m f
orc
e F
mF
m, m
axp
roo
f fo
rce
d Fp0
,1
Mm
MP
am
m2
g/m
%kN
kNkN
AY
1960
S3
1.13
615,
219
6013
,610
6±
226
,730
,522
,9Y
1860
S3
1.13
606,
518
6021
,116
5±
239
,244
,933
,86,
823
,418
343
,549
,837
,47,
529
,022
654
,061
,746
,4Y
1860
S7
1.13
667,
018
6030
234
±2
5665
489,
050
390
9310
680
11,0
7558
614
016
012
012
,593
726
173
198
149
13,0
100
781
186
213
160
15,2
140
1095
260
298
224
16,0
150
1170
279
319
240
Y17
70S
71.
1365
15,2
1770
140
1095
248
282
213
16,0
150
1170
265
302
228
18,0
200
1560
± 2
354
403
304
Y18
60S
7G1.
1372
12,7
1860
112
875
±2
209
238
180
Y18
20S
7G1.
1371
15,2
1820
165
1290
±2
300
342
258
Y17
00S
7G1.
1370
18,0
1700
223
1740
±2
380
436
327
BY
2160
S3e
5,2
2160
13,6
106
±2
29,4
33,7
26,2
Y20
60S
3e1.
1362
5,2
2060
13,6
106
±2
28,0
32,1
24,1
Y19
60S
3e1.
1361
6,5
1960
21,1
165
±2
41,4
47,3
35,6
Y21
60S
7e6,
8521
6028
,222
0±
260
,969
,752
,4Y
2060
S7e
1.13
687,
020
6030
234
±2
62,0
71,0
53,0
Y19
60S
71.
1367
9,0
1960
5039
0±
298
112
84
a The
nom
inal
mod
ulus
of e
last
icity
may
be
take
n to
be
195
GP
a (k
N/m
m2 ).
b The
nom
inal
tens
ile s
tren
gth
is c
alcu
late
d fr
om th
e no
min
al c
ross
sec
tiona
l are
a an
d th
e sp
ecifi
ed c
hara
cter
istic
max
imum
forc
e, r
ound
ed to
the
near
est 1
0 M
Pa.
c The
cro
ss-s
ectio
nal a
rea
is c
alcu
late
d fr
om th
e no
min
al m
ass
and
a de
nsity
of 7
,81
kg/d
m3 .
d T
he s
peci
fied
char
acte
ristic
0.1
% p
roof
forc
e is
app
roxi
mat
ely
86 %
of t
he s
peci
fied
char
acte
ristic
max
imum
forc
e.e 3
-wire
str
and
and
the
7-w
ire s
tran
d of
dia
met
er 6
,85
mm
and
7,0
mm
are
nor
mal
ly o
nly
used
for
pres
tres
sing
with
dire
ct b
ond.
f 1 M
Pa
= 1
N/m
m2 .
Page 10prEN 10138-3:2000
Table 3 — Additional requirements for strand
Property Specification
Minimum elongation at maximum force ,Agt, with Lo � 500 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 Fup according to 70 % actualmax. 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
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/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.
Page 11prEN 10138-3:2000
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.
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 tocomply 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
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 Delivery conditions
9.1 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 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.
Page 13prEN 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 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.
Page 14prEN 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 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.