MINISTRY OF
SCIENCE AND TECHNOLOGY
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|
SOCIALIST
REPUBLIC OF VIETNAM
Independence - Freedom - Happiness
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No.
21/2011/TT-BKHCN
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Hanoi, September
22, 2011
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CIRCULAR
PROMULGATION
OF NATIONAL TECHNICAL REGULATION ON STEEL FOR THE REINFORCEMENT OF CONCRETE
Pursuant to the Law on Technical regulations and
standards dated June 29, 2006;
Pursuant to the Government's Decree No. 127/2007/ND-CP
dated August 01, 2007 detailing the implementation of a number of articles of
the Law on Technical regulations and standards;
Pursuant to the Government's Decree No.
28/2008/ND-CP dated March 14, 2008 defining the functions, tasks, powers and
organizational structure of the Ministry of Science and Technology;
At the request of Director of the Directorate
for Standards, Metrology, and Quality,
The Minister of Science and Technology
promulgates a Circular on promulgation of a National Technical Regulation on
steel for the reinforcement of concrete.
Article 1. National Technical Regulation on steel for the reinforcement
of concrete (QCVN 7:2011/BKHCN) is promulgated together with this Circular.
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Article 3. From December 01, 2012, domestically and imported steel for
concrete reinforcement shall apply QCVN 7:2012/BKHCN.
From June 01, 2013, all for concrete reinforcement
circulated on the market shall apply QCVN 7:2012/BKHCN.
Article 4. From the effective date of this Circular to the time
specified in Article 3, organizations and individuals involved in manufacture,
import and distribution of steel for concrete reinforcement shall prepare
themselves to apply this QCVN.
Article 5. Director of the Directorate for Standards, Metrology, and
Quality, heads of relevant organizations and relevant individuals are
responsible for the implementation of this Circular.
Difficulties that arise during the implementation
of this Circular should be reported to the Ministry of Science and Technology
for consideration./.
PP MINISTER
DEPUTY MINISTER
Tran Viet Thanh
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NATIONAL
TECHNICAL REGULATION ON STEEL FOR THE REINFORCERMENT OF CONCRETE
Forewords
QCVN 7:2011/BKHCN is drafted and submitted by the
Directorate for Standards, Metrology, and Quality and promulgated together with
Circular No. 21/2011/TT-BKHCN dated September 22, 2011 of the Minister of
Science and Technology.
NATIONAL
TECHNICAL REGULATION ON STEEL FOR THE REINFORCEMENT OF CONCRETE
1. GENERAL PROVISIONS
1.1. Scope
This document provides for technical limits of
steel for concrete reinforcement, steel for the prestressing of concrete and
epoxy-coated steel (hereinafter referred to as “steel for reinforcement of
concrete”), quality control of domestic and imported steel for reinforcement of
concrete.
This document does not apply to steel for
reinforcement of concrete that are shaped steel, plated steel and steel fibre
concrete reinforcement.
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This document applies to manufacturers, importers
and distributors of steel for reinforcement of concrete, relevant regulatory
bodies, organizations and individuals.
1.3. Definitions
For the purposes of this document, the terms below
are construed as follows:
1.3.1. Batch: steel for reinforcement of
concrete of the same grade, with the same nominal diameter and belong to the
same batch.
1.3.2. Shipment: steel for reinforcement of
concrete of the same grade, with the same nominal diameter and label content,
imported, distributed or retailed by the same entity at the same location.
1.3.3. Grades of steel for reinforcement of
concrete:
Symbols of various grades of steel for
reinforcement of concrete are specified in TCVN 1651-1:2008 and
TCVN1651-2:2008, to be specific:
- Plain bars: CB240-T; CB300-T;
- Ribbed bars: CB300-V; CB400-V; CB500-V.
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1.3.4. Nominal cross-sectional area of a ribbed
bar is the same as that of a plain bar with the same nominal diameter.
2. TECHNICAL REQUIREMENTS
2.1. Steel for reinforcement of concrete:
2.1.1. Dimensions and unit weight (kg/m) and
tolerances are specified in Table 1.
2.1.2. Grades and mechanical properties of
plain bars are specified in TCVN 1651-1:2008, Steel for the reinforcement of
concrete - Part 1: Plain bars (do not apply Rm/ReH ≥ 1,46
in Table 5).
2.1.3. Requirements, grades and mechanical
properties of ribbed bars shall comply with TCVN 1651-2:2008, Steel for the
reinforcement of concrete - Part 2: Ribbed bars.
2.1.4. Shapes, dimensions and mechanical properties
of welded fabric shall comply with TCVN 1651-3:2008 (ISO 6395-3:2007), Steel
for the reinforcement of concrete - Part 3: Welded fabric.
2.2. Steel for the prestressing of concrete
Shapes, dimensions, unit weight, tolerances and
mechanical properties of steel for the prestressing of concrete shall comply
with TCVN 6284:1997 (ISO 6934:1991), Steel for the prestressing of concrete:
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Part 2 - Cold-drawn wire;
Part 3 - Quenched and tempered wire;
Part 4 – Strand;
Part 5 - Hot-rolled steel bars with or without
subsequent processing.
2.3. Epoxy-coated steel for the reinforcement of
concrete
Shapes, dimensions, unit weight, tolerances and
mechanical properties of epoxy-coated steel for the reinforcement of concrete
shall comply with:
- TCVN 7934:2009 (ISO 14654:1999), Epoxy-coated
steel for the reinforcement of concrete;
- TCVN 7935:2009 (ISO 14655:1999), Epoxy-coated
strand for the prestressing of concrete.
2.4. International standards, regional
standards, foreign standards and ASTM standards applied to shapes, dimensions,
weight, tolerances, grades, mechanical properties of domestic and imported
steel for reinforcement of concrete shall be declared by their manufacturers.
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Nominal
diameter
d
mm
Nominal
cross-sectional area a
An
mm2
Unit weight
Requirements b
kg/m
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%
6
28,3
0,222
±8
8
50,3
0,395
±8
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78,5
0,617
±6
12
113
0,888
±6
14
154
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±5
16
201
1,58
±5
18
255
2,00
±5
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314
2,47
±5
22
380
2,98
±5
25
491
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±4
28
616
4,83
±4
32
804
6,31
±4
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1018
7,99
±4
40
1257
9,86
±4
50
1964
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±4
a An = 0,785 4 x d2.
b Weight = 7,85 x 10-3 x An.
c Tolerance for a single bar.
1) Diameter d50 only apply to ribbed bars.
2) Nominal diameters under international
standards, regional standards, foreign standards and ASTM standards applied
by manufacturers are permissible if they are not contrary to relevant
regulations of this document.
3. TEST METHODS
3.1. Methods for testing mechanical
properties of steel for reinforcement of concrete and steel for the prestressing
of concrete shall comply with the following standards:
3.1.1. TCVN 7937-1:2009 (ISO 15630-1:2002),
Steel for the reinforcement and prestressing of concrete - Test methods - Part
1: Reinforcing bars, wire rod and wire.
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3.1.3. TCVN 7937-3:2009 (ISO 15630-3:2002),
Steel for the reinforcement and prestressing of concrete - Test methods - Part
3: Prestressing steel.
Standards applied to isothermal recovery test in
1000 hours of domestic steel for prestressing of concrete shall be declared by
manufacturers.
Standards applied to isothermal recovery test in
1000 hours of imported steel for prestressing of concrete shall be declared by
manufacturers and the declaration and proof that the test has been carried out
must be included in the import documentation.
3.2. Methods for testing mechanical
properties of epoxy-coated steel for reinforcement of concrete and prestressing
of concrete shall comply with the following standards:
- TCVN 7934:2009 (ISO 14654:1999), Epoxy-coated
steel for the reinforcement of concrete;
- TCVN 7935:2009 (ISO 14655:1999), Epoxy-coated
strand for the prestressing of concrete;
- TCVN 7936:2009 (ISO 14656:1999), Epoxy powder and
sealing material for the coating of steel for the reinforcement of concrete.
3.3. International standards, regional
standards, foreign standards and ASTM standards applied to test methods of
domestic and imported steel for reinforcement of concrete shall be declared by
their manufacturers.
4. LABELLING
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4.2. Label of a bundle or roll of steel
4.2.1. Each bundle or roll of steel for
reinforcement of concrete shall have a label.
4.2.2. Mandatory information on a label of
domestic steel:
- The manufacturer’s name and address;
- The product name;
- Number of the applied standard as declared by the
manufacturer;
- Conformity marking;
- Grade of steel;
- Weight of the bundle or roll;
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- Batch number;
- Month and date of production.
4.2.3. Mandatory information on secondary
label (in Vietnamese language) of imported steel:
- The manufacturer’s name and address;
- Country of origin;
- Name and address of the importer;
- The product name;
- Number of the applied standard as declared by the
manufacturer;
- Conformity marking;
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- Weight of the bundle or roll;
- Nominal diameter;
- Batch number;
- Month and date of production.
4.3. Ribbed bar markings
Markings on each ribbed bar must be presented in
the following order:
- Logo or abbreviated name of the manufacturer;
- Grade symbol:
CB 240 or CB 2;
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CB 400 or CB 4;
CB 500 or CB 5.
- Nominal diameter d;
Example : TISCO CB 240 d10 or TISCO CB 2 d10.
4.4. International standards, regional
standards, foreign standards and ASTM standards applied to labelling of
domestic and imported steel for reinforcement of concrete shall be declared by
their manufacturers.
5. QUALITY CONTROL
5.1. Domestic steel for reinforcement of
concrete
5.1.1. Each type (according to their
grades and nominal diameter) of domestic steel for reinforcement of concrete
shall have a declaration of conformity with provisions in Section 2 and Section
4 of this document on the following grounds:
a) The certificate of conformity issued by a
certification body appointed or recognized by the Directorate for Standards,
Metrology, and Quality; or
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Conformity certification shall be carried out
according to typical sample test methods and manufacture process evaluation;
supervision through samples taken at the factory or on the market in
combination with manufacture process evaluation (Method 5 in Appendix II of
Decision No. 24/2007/QD-BKHCN) and regulations on conformity assessment in TCVN
1651:2008, steel for reinforcement of concrete.
5.1.2. There must be a conformity marking on
the label of each bundle or roll of domestic steel for reinforcement of
concrete is sold on the market.
5.2. Imported steel for the reinforcement of
concrete
5.2.1. Each type of steel (according to
their grades and nominal diameter) in a shipment of imported steel for the
reinforcement of concrete must undergo inspection or conformity certification
in accordance with Section 2 and Section 4 of this document according to Method
7 in Appendix II of Decision No. 24/2007/QD-BKHCN).
The inspection or conformity certification of
imported steel for reinforcement of concrete shall be carried out by domestic
or foreign certification bodies appointed or recognized by the Directorate for
Standards, Metrology, and Quality.
5.2.2. If a shipment imported steel for
reinforcement of concrete already has the certificate of conformity with
provisions of Section 2 and Article 4.4 under Method 2 granted by a
certification body appointed or recognized by the Directorate for Standards,
Metrology, and Quality, the importer is not required to have the shipment
undergo inspection or certification under Method 7.
5.2.3. Imported steel for reinforcement of
concrete must undergo state inspection of quality as prescribed in Circular No.
17/2009/TT-BKHCN.
A declaration of conformity is not required if a
shipment of steel for reinforcement of concrete has already undergone such an
inspection as prescribed in Decision No. 24/2007/QD-BKHCN.
5.2.4. There must be a conformity marking on
the label of each bundle or roll of imported steel for reinforcement of
concrete that is being sold on the market.
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5.3.1. There must be a conformity marking on
the label of steel for reinforcement of concrete circulating on the market; the
label content shall comply with Section 4 of this document.
5.2.3. Steel for reinforcement of concrete
circulating on the market must undergo state inspection of quality as
prescribed in Circular No. 16/2009/TT-BKHCN.
5.4. Conformity certification, declaration of
conformity, conformity markings and conformity assessment methods
5.4.1. The Certificate of conformity,
declaration of conformity, conformity markings and conformity assessment
methods mentioned in Articles 5.1, 5.2 and 5.3 shall comply with Decision No.
24/2007/QD-BKHCN.
5.4.2. The appointment or recognition of a
certification body shall comply with Circular No. 09/2009/TT-BKHCN and Circular
No. 11/2011/TT-BKHCN.
5.5. Other cases
In the cases where domestic steel for reinforcement
of concrete cannot be evaluated for conformity certification under Method 5,
Directorate for Standards, Metrology and Quality shall decide on a method or
apply Method 7.
6. RESPONSIBILITIES OF VARIOUS
ORGANIZATIONS AND INDIVIDUALS
6.1. Domestic manufacturers shall comply with
regulations on declarations of conformity and labeling specified in Sections 2,
4 and 5 of this document.
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6.2. Importers shall have their imported
products undergo inspection, conformity certification, state inspection and
labeling in accordance with requirements specified in Sections 2, 4 and 5 of this
document.
6.3. Distributors and retailers may only
sell steel for reinforcement of concrete that satisfies quality requirements,
bear conformity markings and are conformable with provision of Section 4;
Domestic steel for reinforcement of concrete shall have copies of declaration
of conformity as prescribed in 5.1.1; Imported steel for reinforcement of
concrete shall have copies of notification of satisfactory import quality as
prescribed in 5.2.3.
7. IMPLEMENTATION
7.1. Directorate for Standards, Metrology,
and Quality shall cooperate with relevant authorities in providing guidance and
organizing the implementation of this document.
7.2. In the cases where any of the
legislative documents or standards referred to in this document is amended or
superseded, the newer one shall apply./.