GB/T 33240-2016 English PDF (GBT33240-2016)

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GB/T 33240-2016: Zinc-aluminum alloy-epoxy duplex coated steel bars for the reinforcement of concrete
GB/T 33240-2016
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.140.60
H 44
Zinc-aluminum Alloy-epoxy Duplex Coated Steel Bars
for the Reinforcement of Concrete
ISSUED ON: DECEMBER 13, 2016
IMPLEMENTED ON: SEPTEMBER 01, 2017
Issued by: General Administration of Quality Supervision, Inspection and
Quarantine;
Standardization Administration of the People's Republic of
China.
Table of Contents
Foreword ... 3 
1 Scope ... 4 
2 Normative references ... 4 
3 Terms and definitions ... 5 
4 Code and example ... 5 
5 Ordering content ... 5 
6 Technical Requirements ... 6 
7 Test method ... 8 
8 Test rules ... 10 
9 Packaging, marking, quality certificate, transport and storage ... 10 
Appendix A (Normative) Cathodic dis-bonding test ... 12 
Foreword
This Standard was drafted in accordance with the rules given in GB/T 1.1-2009.
This Standard was proposed by China Iron and Steel Industry Association.
This Standard shall be under the jurisdiction of National Technical Committee
183 on Iron and Steel of Standardization Administration of China (SAC/TC 183).
The drafting organizations of this Standard: Xiamen New Steel Metal Products
Co., Ltd., Fujian Provincial Sansteel (Group) Co., Ltd., Xiamen BFD Roads and
Bridges New Technology Co., Ltd., China Metallurgical Information and
Standardization Institute, Fujian Haixi Protection New Materials Joint Research
Institute Co., Ltd., Xiamen Xinning Steel Co., Ltd., Xiamen Baoxinda New
Energy Technology Co., Ltd.
The drafters of this Standard: Zheng Yufei, Liu Jianfeng, Zheng Xu, Liu Baoshi,
Zheng Yu, Wang Yujie, Zheng Jingjing, Zheng Juanjuan.
Zinc-aluminum Alloy-epoxy Duplex Coated Steel Bars
for the Reinforcement of Concrete
1 Scope
This Standard specifies the terms and definitions, classification and code, order
content, technical requirements, test methods, inspection rules, packaging,
marking, quality certificate, transport and storage of zinc-aluminum alloy-epoxy
duplex coated steel bars.
This Standard applies to zinc-aluminum alloy-epoxy duplex coated steel bars
and reinforced round bars for the reinforcement of concrete (hereinafter
referred to as steel bars). The zinc-aluminum alloy coating shall be produced
by continuous hot dip coating; the epoxy coating shall be produced by
electrostatic spraying.
2 Normative references
The following documents are indispensable for the application of this document.
For dated references, only the dated version applies to this document. For
undated references, the latest edition (including all amendments) applies to this
document.
GB/T 470, Zinc ingots
GB 1499.1, Steel for the reinforcement of concrete. Part 1: Hot rolled plain
bars
GB 1499.2, Steel for the reinforcement of concrete. Part 2: Hot rolled ribbed
bars
GB/T 2101, General requirement of acceptance, packaging, marking and
certification for section steel
GB/T 4956, Non-magnetic coatings on magnetic substrates - Measurement
of coating thickness - Magnetic method
GB/T 25826, Epoxy-coated steel for the reinforcement of concrete
GB/T 50152, Standard for test method of concrete structures
GB/T 32968, Zinc-aluminum alloy coated steel bars for the reinforcement of
concrete
YB/T 081, Rule for rounding off of numeric values and judgment of testing
values for technical standards of metallurgy
YS/T 310, Zinc alloy ingot for hot dip galvanizing
3 Terms and definitions
Terms and definitions determined by GB/T 32968, GB/T 25826 and the
following ones are applicable to this document.
3.1 Duplex coating
On the clean metal surface, firstly perform continuous hot dipping zinc-
aluminum alloy; then, coat a coating that is obtained from epoxy resin.
3.2 Fusion-bonded epoxy coating
Spray on a heated clean metal surface in powder form to form a continuous
coating after curing. The coating contains a thermosetting epoxy resin, a curing
agent, a pigment, and other additives.
4 Code and example
4.1 Code
The duplex coating steel is coded as ZEDR (the first letters of the words of Zinc-
aluminum, Epoxy, Duplex, Reinforcement).
4.2 Model and example
The model of the duplex coating steel consists of the code number, the steel
grade and the nominal diameter of the steel, and the plating grade.
Example:
For the duplex steel bar, of which the nominal diameter is 20 mm, the grade is
HRB400 hot-rolled ribbed steel bar and the zinc-aluminum alloy coating, the
level is level-B, its product model is “ZEDR·HRB400-20B”.
5 Ordering content
Contracts which order under this Standard shall include the following main
contents:
a) product name;
b) number of this Standard;
c) product model;
d) weight;
e) length;
f) repair material requirements;
g) special requirements.
6 Technical Requirements
6.1 Materials
6.1.1 Steel bar
The base material for making duplex coating steel bars shall meet the
requirements of GB 1499.1 or GB 1499.2 or GB/T 32968 or other product
standards that are proposed by the buyer. The surface of the base material of
the steel bar shall not have burrs, sharp corners and other defects that affect
the quality of the coating, and shall be free of oil, grease or paint.
6.1.2 Zinc-aluminum alloy ingot
Zinc-aluminum alloy ingots shall comply with the requirements of YS/T 310.
6.1.3 Zinc ingot
Zinc ingots shall comply with the provisions of GB/T 470.
6.1.4 Epoxy resin powder coating
The coating that is formed by epoxy resin powder shall meet the requirements
of GB/T 25826.
6.1.5 Repair materials
The repair material of zinc-aluminum alloy coating shall comply with the
provisions of GB/T 32968. The repair material of epoxy coating shall comply
with the provisions of GB/T 25826.
6.2 Coating requirements
6.2.1 Appearance
The surface of the zinc-aluminum alloy coating shall be uniform and continuous,
and there shall be no defects such as leakage plating, zinc tumor, zinc thorn
and slagging. After the epoxy coating is cured, the surface shall be flat, uniform
in color, free of bubbles, cracks, shrinkage cavities, and other visible defects.
6.2.2 Coating thickness
The thickness of the zinc-aluminum alloy coating shall meet the thickness
requirements of grade-B or grade-C of GB/T 32968. The recorded value of the
duplex coating thickness after curing shall have at least 95% of probability
between 180 μm ~ 300 μm; the single recorded value must not be lower than
140 μm. The upper limit of the coating thickness is not applicable to the area
where the damaged coating is repaired. For environments with higher
requirements on corrosion resistance, the recorded value of the coating
thickness after curing shall have at least 95% of probability between 220 μm ~
400 μm; the single recorded value must not be lower than 180 μm.
Note: the above coating thickness requirements do not include areas that are
repaired due to coating defects or breakage.
6.2.3 Coating continuity
The number of leaks per meter of the steel bar shall not exceed 3.
6.2.4 Coating flexibility
The steel bar shall be tested for coating flexibility. After the sample is bent, the
coating on the outer surface of the bending portion of the sample shall be free
of visible cracks or peeling.
6.2.5 Coating adhesion
The coating adhesion test of the steel bar shall be carried out by the cathodic
dis-bonding test method. Before the test, the flexibility test shall be carried out...