oSIST prEN 10138-3:2023
(Main)Prestressing steels - Part 3: Bars
Prestressing steels - Part 3: Bars
This document specifies the requirements and definitions for the essential characteristics of prestressing bars, which are used for the prestressing of concrete and which are delivered as finished products in the form of:
- hot rolled and processed bars;
- plain and threaded bars.
NOTE 1 The specification of manufacturing processes related to the finished product is required to ensure that the essential characteristics can be tested properly and that test results are valid. It is not possible to anticipate that any other manufacturing process leads to products which can be tested properly with the specified test methods. Thus, a conclusion to the safe application in building construction would not any longer be possible for those products.
This document does not apply to:
- galvanized steel;
- epoxy coated steel;
- reinforcing steel (see EN 10080);
- further processing.
NOTE 2 Example for further processing: Plain bars are also applied in systems for the prestressing of concrete with threaded ends. The threaded ends depend in length and type on the intended use of the system and are manufactured downstream in the supply chain.
Spannstähle - Teil 3: Stäbe
Diese Europäische Norm legt allgemeine Anforderungen und Definitionen für die Leistungsmerkmale von Spannstäben fest, die für das Vorspannen von Betonbauwerken verwendet und als Fertigerzeugnis geliefert wird in Form von:
- warmgewalzten und verarbeiteten Stäben;
- glatten oder gerippten Stäben
ANMERKUNG 1 Die Spezifikation des Herstellungsverfahrens ist erforderlich, um sicherzustellen, dass die wesentlichen Merkmale ordnungsgemäß getestet werden können und dass die Prüfergebnisse gültig sind. Es ist nicht vorhersehbar, dass ein weiterer Herstellungsprozess zu Erzeugnissen führt, die mit den angegebenen Prüfmethoden ordnungsgemäß getestet werden können. Als Schlussfolgerung: eine sichere Anwendung wäre im Hochbau für diese Produkte nicht mehr möglich.
Diese Europäische Norm gilt nicht für
- verzinkten Betonstahl;
- epoxibeschichteten Betonstahl;
- Betonstahl (siehe EN 10080);
- Weiterverarbeitung.
ANMERKUNG 2 Beispiel für die Weiterverarbeitung: Glatte Stäbe sind auch als Gewindestäbe zum Vorspannen von Beton eingesetzt. Die Gewindelänge an den Stabenden hängt von dem Bautyp ab und wird nachträglich in der Lieferkette hergestellt.
Armatures de précontrainte en acier - Partie 3 : Barres
Le présent document spécifie les prescriptions et les définitions des caractéristiques essentielles des barres de précontrainte utilisées pour la précontrainte du béton et livrées en tant que produits finis sous forme de :
- barres laminées à chaud et traitées ;
- barres lisses et filetées.
NOTE 1 La spécification des procédés de fabrication relatifs au produit fini est requise pour assurer que les caractéristiques essentielles peuvent être soumises à essai correctement et que les résultats d’essais sont valides. Il n'est pas possible de prévoir qu'un autre procédé de fabrication conduise à des produits pouvant être soumis à essai correctement avec les méthodes d'essai spécifiées. Il ne serait donc plus possible de conclure à une application sûre dans la construction de bâtiments pour ces produits.
Le présent document ne s'applique pas à :
- l'acier galvanisé ;
- l'acier avec revêtement époxy ;
- l'acier pour béton armé (voir EN 10080) ;
- au traitement ultérieur.
NOTE 2 Exemple de traitement ultérieur : Les barres lisses sont également utilisées dans les systèmes de précontrainte du béton avec des extrémités filetées. Les extrémités filetées dépendent, pour leur longueur et leur type, de l'utilisation prévue du système et sont fabriquées en aval de la chaîne d'approvisionnement.
Prednapeta jekla - 3. del: Palice
General Information
Standards Content (Sample)
SLOVENSKI STANDARD
oSIST prEN 10138-3:2023
01-julij-2023
Prednapeta jekla - 3. del: Palice
Prestressing steels - Part 3: Bars
Spannstähle - Teil 3: Stäbe
Armatures de précontrainte en acier - Partie 3 : Barres
Ta slovenski standard je istoveten z: prEN 10138-3
ICS:
77.140.15 Jekla za armiranje betona Steels for reinforcement of
concrete
77.140.60 Jeklene palice in drogovi Steel bars and rods
oSIST prEN 10138-3:2023 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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oSIST prEN 10138-3:2023
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oSIST prEN 10138-3:2023
DRAFT
EUROPEAN STANDARD
prEN 10138-3
NORME EUROPÉENNE
EUROPÄISCHE NORM
May 2023
ICS 77.140.15
English Version
Prestressing steels - Part 3: Bars
Armatures de précontrainte en acier - Partie 3 : Barres Spannstähle - Teil 3: Stäbe
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee
CEN/TC 459/SC 4.
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 CEN-CENELEC
Management Centre has the same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and
United Kingdom.
Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are
aware and to provide supporting documentation.
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
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2023 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 10138-3:2023 E
worldwide for CEN national Members.
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oSIST prEN 10138-3:2023
prEN 10138-3:2023 (E)
Contents Page
European foreword . 4
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 5
4 Symbols . 8
5 Essential characteristics . 10
5.1 Tensile strength, tensile yield strength, stress ratio (ult. tensile strength/tens. yield
strength), modulus of elasticity and elongation at maximum load . 10
5.2 Relaxation . 10
5.3 Fatigue strength . 11
5.4 Durability . 11
5.5 Surface geometry . 11
5.5.1 Plain bar surface . 11
5.5.2 Thread bar surface for threads over the entire circumference . 11
5.5.3 Thread bar surface for threads over parts of the circumference (two rib rows) . 12
5.6 Section and tolerances . 13
5.6.1 Mass per meter and tolerances . 13
5.6.2 Length of bars . 14
5.6.3 Straightness . 14
6 Assessment and verification of constancy of performance . 17
6.1 General . 17
6.2 Product type testing . 17
6.2.1 General . 17
6.2.2 Test samples and testing . 18
6.2.3 Compliance criteria . 23
6.2.4 Re-testing . 24
6.2.5 Test report . 24
6.3 Factory production control (FPC) . 24
6.3.1 General . 24
6.3.2 Requirements . 24
6.4 Initial inspection of factory and of FPC . 32
6.5 Continuous surveillance of FPC . 32
6.5.1 General . 32
6.5.2 Audit testing of samples taken from the factory . 33
6.5.3 Procedure for modifications . 36
7 Test methods . 36
8 Delivery conditions . 36
8.1 General . 36
8.2 Packaging and handling . 36
8.3 Transport and storage . 37
8.4 Freedom from defects. 37
8.5 Welds . 37
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Annex A (normative) Prestressing bars - Stress corrosion test in distilled water . 38
A.1 Scope . 38
A.2 Principle of the test . 38
A.3 Specimen . 38
A.4 Test device . 38
A.5 Test conditions . 39
A.6 Procedure . 40
A.7 Measurements . 40
A.8 Expression of results . 41
A.9 Test report . 41
Annex ZA (informative) Relationship of this European Standard with Regulation (EU)
No.305/2011 . 42
Bibliography . 46
3
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prEN 10138-3:2023 (E)
European foreword
This document (prEN 10138-3:2023) has been prepared by Technical Committee CEN/TC 459/SC4
“Concrete reinforcing and prestressing steels”, the secretariat of which is held by DIN.
This document is currently submitted to the CEN Enquiry.
This document has been prepared under a Standardization Request given to CEN by the European
Commission and the European Free Trade Association, and supports essential requirements of EU
Directive(s) / Regulation(s).
For relationship with EU Directive(s) / Regulation(s), see informative Annex ZA, which is an integral part
of this document.
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1 Scope
This document specifies the requirements and definitions for the essential characteristics of prestressing
bars, which are used for the prestressing of concrete and which are delivered as finished products in the
form of:
— hot rolled and processed bars;
— plain and threaded bars.
NOTE 1 The specification of manufacturing processes related to the finished product is required to ensure that
the essential characteristics can be tested properly and that test results are valid. It is not possible to anticipate that
any other manufacturing process leads to products which can be tested properly with the specified test methods.
Thus, a conclusion to the safe application in building construction would not any longer be possible for those
products.
This document does not apply to:
— galvanized steel;
— epoxy coated steel;
— reinforcing steel (see EN 10080);
— further processing.
NOTE 2 Example for further processing: Plain bars are also applied in systems for the prestressing of concrete
with threaded ends. The threaded ends depend in length and type on the intended use of the system and are
manufactured downstream in the supply chain.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments) applies.
EN 10020:2000, Definition and classification of grades of steel
EN 10079:2007, Definition of steel products
EN ISO 15630-3:2019, Steel for the reinforcement and prestressing of concrete — Test methods — Part 3:
Prestressing steels (EN ISO 15630-3:2019, Corrected version 2019-10)
3 Terms and definitions
For the purposes of this document, the terms and definitions given in EN 10020:2000 and
EN 10079:2007 and the following apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https://www.iso.org/obp/
— IEC Electropedia: available at https://www.electropedia.org/
5
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3.1
prestressing steel
steel product with a circular or practically circular cross-section which is suitable for the prestressing of
concrete
3.2
hot rolled bar
product manufactured in straight lengths in a hot rolling mill
NOTE 1 to entry: It may be plain or present threads.
3.3
processed bar
hot rolled bar treated after production by accelerated cooling (including quenching), cold stretching or
additional tempering, either singly or in combination
NOTE 1 to entry: It may be plain or present threads.
3.4
threaded prestressing bar
bar with up to two rows of transverse ribs arranged helically or circumferential, which are uniformly
distributed over the entire length and which are screwable
3.5
plain prestressing bar
bar with a smooth surface
3.6
heat
quantity of steel corresponding to the same casting operation identified by a single number so designated
by the steel manufacturer
3.7
rib height
distance from the highest point of the thread to the surface of the core, to be measured normal to the axis
of the bar
3.8
rib spacing
distance between the centres of two consecutive threads measured parallel to the axis of the bar
3.9
rib inclination
angle between the axis of the transverse thread or indentation and the longitudinal axis of the bar
3.10
specified value
value which is defined in a standard and has not been measured or calculated with measured values. A
specified value can be a characteristic, a minimum, a maximum or any testing value
NOTE 1 to entry: The specified value may be declared by the manufacturer in his declaration of performance.
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3.11
testing value
value which defines testing conditions such as e.g. testing temperature, specified maximum stress in the
fatigue test or bending diameter in the bend test
3.12
characteristic value
value of a material or product property having a prescribed probability of not being attained in a
hypothetical unlimited test series
NOTE 1 to entry: This value generally corresponds to a specific fractile of the assumed statistical distribution of
the particular property of the material or product.
3.13
minimum value
value below which no test result shall fall
3.14
maximum value
value which no test result shall exceed
3.15
median value
value separating the higher half from the lower half of a data sample
3.16
product type
set of representative performance levels or classes of a construction product, in relation to its essential
characteristics, produced using a given combination of raw materials or other elements in a specific
production process (see CPR – Regulation No 305/2011, Article 2. 9)
NOTE 1 to entry: A set of different diameters of the same mechanical properties and same surface geometry of
bars tested on the same cross-section type.
3.17
test unit
number of pieces or the tonnage of products to accept or reject together, on the basis of the verification
tests carried out on sample products in accordance with the requirements of the product standard or
order
3.18
sample product
item (e.g. bar, sheet, coil) selected for inspection or testing
3.19
sample
sufficient quantity of material taken from the sample product for the purpose of producing one or more
test pieces
3.20
test piece
part of a sample, with specified dimensions, machined or unmachined, brought to a required condition
for submission to a given verification test
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NOTE 1 to entry: Example for the application of the terms test piece, sample, sample product, test unit and product
type:
The product type consist of prestressing bars in the diameter range of 18 mm to 47 mm, manufactured as hot rolled
bars with a set of mainly same declared performance level for the essential characteristics. (e.g. for mainly: Same
declared performance level each for tensile strength, tensile yield strength etc. independent on diameter but with
different performance levels for fatigue strength, relaxation).
The test unit for the product type testing of e.g. the essential characteristic tensile yield strength is specified as
lower, intermediate and upper diameter of the diameter range of the product type each manufactured out of 3
different heats. This test unit is composed of in total 9 sample products (each a combination of heat and diameter).
For each sample product a specified number of test pieces is to be taken. This specified number of test pieces per
sample product is called sample.
4 Symbols
The symbols used in this document and the corresponding designations are given in Table 1.
Table 1 — Symbols and corresponding designations
Symbol Unit Designation
A % Characteristic value of percentage total elongation at maximum force
gt
A % Elongation under maximum force after test for durability testing
gtr
according to Annex A
a mm Rib height for threaded bar
b mm Rib top width of a threaded bar
K
b mm Rib bottom width of a threaded bar
F
C kN, %,- Specified characteristic value for essential characteristics
v
c mm Rib space for a threaded bar
d mm Nominal diameter
d mm Horizontal core diameter of a threaded bar
h
d mm Major diameter of a threaded bar
ma
d mm Minor diameter of a threaded bar
mi
d mm Vertical core diameter of a threaded bar
v
E GPa Characteristic value of modulus of elasticity
F kN Initial force in relaxation and durability test, based on actual force
0
kN Mean value of maximum force in durability testing according to
F
m
EN ISO 15630-3
F kN Maximum force after test for durability testing according to Annex A
mr
F kN Force at the conventional yield point at 0,1 % after test for durability
p0,1r
testing according to Annex A
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Symbol Unit Designation
F kN Force range in the axial force fatigue test
r
F kN Upper force in the axial force fatigue test
up
h mm/m Deviation from straightness
b
k — Coefficient as a function of the number of test results
L mm Length of the test piece for durability testing according to Annex A
L mm Length of the test piece immersed in distilled water for durability
0
testing according to Annex A
m g/m Nominal mass per meter
N - Number of load cycles in fatigue test
n — Number of test pieces
P - Surface geometry – plain bar
P mm Pitch of a threaded bar
th
p -, % Reliable failure rate
q I/min Flow rate of water circulation for durability testing according to
Annex A
R ° Radius of the transition from rib to core for a threaded bar
R kN Characteristic value of tensile strength
m
R kN Characteristic value of 0,1 % yield strength
p0,1
R /R - Characteristic value of stress ratio
m p0,1
s kN, %,- Estimated standard deviation of the test results for essential
characteristics
S 2 Nominal cross-sectional area
n mm
T °C Test temperature for durability testing according to Annex A
t h Minimum time without fracture in durability test
a
t h Median time to fracture in durability test
f,m
t h Time to fracture for durability testing according to Annex A
fr
x kN, %- Estimated average value of test results for essential characteristics
Z % Stress coefficient after test for durability testing according to Annex A
r
α ° Rib flank angle of a threaded bar
(1-α) — Statistically reliable failure rate
β ° Rib inclination of a threaded bar
ΔF % Percentage loss of initial force F in relaxation test
rt 0
Δl mm Deviation from the nominal length
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Symbol Unit Designation
Δm % Deviation from the nominal mass per meter
5 Essential characteristics
5.1 Tensile strength, tensile yield strength, stress ratio (ult. tensile strength/tens. yield
strength), modulus of elasticity and elongation at maximum load
a) In the context of this document the characteristic value C is the lower or upper limit (fractile p) of
v
the confidence interval at which there is a 95 % probability (1 - α = 0,95) that 95 % (p = 0,95) or 90 %
(p = 0,90) of the individual measured values are at or above this lower limit, and/or are at or below
this upper limit respectively (see Table 5 and Table 6). This definition refers to the long-term quality
level of production (see 6.3.2.5.4).
b) The essential characteristics tensile strength (R ), tensile yield strength (R ), stress ratio
m p0,1,
(R /R ), modulus of elasticity (E) and elongation at maximum load (A ) of prestressing bars are
m p0,1 gt
determined in tensile tests in accordance with EN ISO 15630-3 with the specified number of test
pieces according to Clause 6.
c) The determined characteristic values C for tensile strength, tensile yield strength, stress ratio,
v
modulus of elasticity and elongation at maximum load (R , R , R /R , E and A .) shall be at
m p0,1 m p0,1 gt
least the corresponding specified characteristic values C with:
v
— R : p = 0,05 at 1- α = 0,95 (95 %) and p = 0,95 at 1- α = 0,95 (95 %);
m
— R : p = 0,05 at 1- α = 0,95 (95 %);
p0,1
— R /R : p=0,10 at 1- α = 0,95 (95 %);
m p0,1
— A : p=0,10 at 1- α = 0,95 (95 %);
gt
— E: p=0,10 at 1- α = 0,95 (95 %) and p = 0,90 at 1- α = 0,95 (95 %).
The declared performance is the corresponding specified characteristic value C .
v
d) The values E, R and R shall be calculated using the nominal cross-sectional area S of the
p0,1 m n
product.
5.2 Relaxation
a) Relaxation of a prestressing bar is specified as the percentage loss of initial force F determined in
0
an isothermal relaxation test in accordance with EN ISO 15630-3 with the number of test pieces
according to Clause 6.
b) The declared performance for relaxation is the percentage loss ΔF of initial force F . Different
rt 0
relaxations may be declared for one product or the product type. This applies as well for different
diameter ranges within one product type.
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5.3 Fatigue strength
a) Fatigue strength is specified as a number of force cycles N at a force range F and a maximum force
r
F and shall be determined by an axial force controlled fatigue test in accordance with
up
EN ISO 15630-3 with the number of test pieces according to Clause 6. For the force range F and the
r
maximum force F nominal values apply.
up
b) The declared performance is the number of force cycles N fulfilled for the specified number of
individual tests at a force range F and a maximum force F . Different fatigue strengths may be
r up
declared for one product or the product type. This applies as well for different diameter ranges
within one product type.
It is recommended that the declared number of force cycles N fulfilled for the specified number of
individual tests at a force range F and a maximum force F corresponds to the design specification for
r up
N* and Δσ of EN 1992-1-1.
Rsk
5.4 Durability
a) Durability is specified as the resistance of prestressing bar against hydrogen induced stress
corrosion cracking in thiocyanate solutions A and/or B and/or distilled water (solution C)
determined in accordance with EN ISO 15630-3 and/or Annex A with the number of test pieces
according to Clause 6.
b) The declared performance is the minimum time in hours t without fracture and/or, where
a
applicable, the median time in hours t until fracture in the used test solution (A or B according to
f,m
EN ISO 15630-3 or distilled water C according to Annex A) at an initial force F declared as
0
percentage of (mean value according to EN ISO 15630-3) for the specified number of individual
F
m
tests. Different durability’s may be declared for one product or the product type. This applies as well
for different diameter ranges within one product type.
According to EN ISO 15630-3, F = 80 % of F is recommended.
0 m
5.5 Surface geometry
5.5.1 Plain bar surface
For plain bars no parameters and measurements apply and the declaration of performance is P for plain
bar.
5.5.2 Thread bar surface for threads over the entire circumference
Surface geometry is declared as a full set of the following thread parameters (see Figure 1):
Major diameter d
ma
Minor diameter d
mi
Pitch P
th
Rib flank angle α
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Figure 1 — Example for threaded bar geometry - threads over the entire circumference
Each thread parameter shall be declared as a range between minimum and maximum value. The thread
parameters shall be determined with an accuracy in accordance with EN ISO 15630-3 with the number
of test pieces according to Clause 6.
5.5.3 Thread bar surface for threads over parts of the circumference (two rib rows)
Surface geometry is declared as a full set of the following thread parameters (see Figure 2):
— core diameter d
v
— core diameter d
h
— rib hight a
— rib spacing c
— rib inclination β
— rib top width b and rib bottom width b
K F
Each thread parameter shall be declared as a range in between a minimum value and a maximum value.
The thread parameters shall be determined in accordance with EN ISO 15630-3 with the number of test
pieces according to Clause 6.
The declared thread parameters should not be outside the thresholds shown in the following Table 2.
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Table 2 — Ranges for the thread parameters
Core diameter Rib height Rib spacing Rib Rib top Rib bottom
inclination width width
d d a c β b b
h v k F
0,95d- 0,92d- 0,025d- 0,30d-0,60d 75°-85° 0,05d- 0,10d-0,50d
1,02d 1,02d 0,10d 0,20d
Figure 2 — Example for threaded bar geometry - threads over parts of the circumference
5.6 Section and tolerances
5.6.1 Mass per meter and tolerances
The values for the nominal mass per meter m are calculated for each nominal diameter d with the values
3
of the nominal cross-sectional area S using a density value of 7,85 kg/dm (see Table 3).
n
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Table 3 — Preferred nominal diameters, cross-sectional areas and masses per meter
Nominal cross Nominal mass per
Nominal Nominal mass per
sectional area meter Plain
diameter meter Thread
S m
d n m
kg/m
mm 2 kg/m
mm
15,0 173 - 1,41
17,5 241 - 1,96
20,0 309 - 2,51
26,0 531 4,17 -
26,5 552 - 4,48
32,0 804 6,31 6,53
36,0 1018 7,99 8,27
40,0 1257 9,87 10,21
47,0 1735 - 14,10
57,0 2581 - 20,95
65,0 3331 - 27,10
75,0 4418 - 35,90
The declared performance is the deviation from the nominal mass per meter Δm in percent. The
permissible deviation from the nominal mass per meter Δm should not be more than −2 %, + 6 % for
d ≤ 47 mm and −5 %, + 6 % for d > 47 mm. Measurements of mass per meter and tolerances shall be
performed according to EN ISO 15630-3 with the number of test pieces according to Clause 6.
5.6.2 Length of bars
The nominal
...
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