4.1.3 Required zinc coating weight [mass] (coated before
fabrication) or zinc coating thickness (coated after fabrication),
4.1.4 Packaging (see Section 13), and
4.1.5 ASTM designation A1060 [A1060M] and year of
issue.
4.2 The purchaser shall have the option to specify additional
requirements, including but not limited to, the following:
4.2.1 Wire size number, wire spacing, and sheet or roll
width and length,
4.2.2 Minimum yield strength or Grade, and
4.2.3 Requirements for inspection (see Section 9),
5. General Requirements
5.1 The wire used in the manufacture of welded wire
reinforcement shall conform to Specification A1064/A1064M.
After galvanizing, the welded wire reinforcement shall meet
the required mechanical properties of Specification A1064/
A1064M except for the bend test requirements as prescribed in
Table 1 of this specification.
5.2 Welded wire reinforcement shall be furnished either in
flat sheets, or in rolls, as specified by the purchaser.
5.3 The zinc used for coating shall be any grade that
conforms to Specification B6.
6. Galvanizing
6.1 Mass [Weight] Thickness of Coating and Test:
6.1.1 This specification includes six classes of coating
weight [mass] when the welded wire reinforcement is coated
before fabrication and four coating thickness grades when the
welded wire reinforcement is coated after fabrication. The
weight [mass] of zinc coating is based on the measured
diameter of the wire when the stripping method is performed
and the nominal diameter for all other methods, and shall
conform to the requirements shown in Table 2 or Table 3.
Individual results not more than 10 % below the minimum
values specified in Table 2 or Table 3 are allowed if the average
of at least two samples from the same coil are equal to or
greater than the minimum, individual results shall be not less
than 1.08 oz/ft
2
[330 g/m
2
].
6.1.1.1 When the product is coated before fabrication in a
continuous coating process, coating weights are given in Table
2for various zinc coating classes.
NOTE 2—Zinc coated wire produced as “regular coating” shall have the
full surface covered with zinc, but there is no specified minimum weight
of coating.
6.1.1.2 When the product is coated after fabrication in a
hot-dip process, coating thickness are given in Table 3 for
various zinc coating grades.
NOTE 3—At the purchaser’s request the galvanized coating may be
chromate treated. This is to minimize a reaction between the reinforcing
steel and fresh portland cement paste. Proprietary chromating solutions of
equivalent strength are permitted in place of the generic chemical
treatment specified.
6.1.2 Magnetic Thickness Measurements—The weight
[mass] of the coating may be determined by magnetic thickness
gage measurements in accordance with Practice E376. The
thickness measurement is used to calculate the weight [mass]
by multiplying it by the surface area of coated wire and by the
zinc density. Because this form of testing can yield inconsistent
and potentially unreliable results on smaller sizes of wire, one
or more of the following methods shall be permitted to be used
to referee and take precedence over the results obtained by
magnetic thickness measurements.
6.1.2.1 Stripping Method—The weight [mass] shall be de-
termined by stripping the coating from the steel wire specimen
in accordance with Section 8and Test Method A90/A90M.
6.1.2.2 Weighing Before and After Galvanizing—The
weight [mass] shall be determined by weighing the sample
before and after galvanizing. The difference between the two
measurements divided by the surface area of the sample
provides the weight [mass]. The original weighing shall occur
after pickling and drying. The second weighing shall occur
after cooling to ambient temperature.
6.1.2.3 Microscopy—The weight [mass] shall be determined
by cross-sectional and optical measurement in accordance with
Test Method B487. A cross-section sample of the steel shall be
polished and examined with an optical microscope to deter-
mine the coating thickness. The coating weight [mass] shall be
determined by multiplying coating thickness by the surface
area of the coated sample and by the density of zinc.
6.1.3 Number of Tests—For determination of the coating
weight [mass], three random samples shall be tested from each
lot. For each magnetic thickness measurement sample, five or
more measurements shall be made along the length and width
of the sample so as to represent the entire surface of the
sample. A total of at least fifteen measurements shall be
averaged to obtain the coating thickness. For the microscopy
method, five samples shall be tested per lot. Each sample shall
be measured on four sides and the total of twenty measure-
ments shall be averaged to obtain the coating thickness. For the
stripping method and the weighing method, three samples per
lot shall be measured.
NOTE 4—A lot shall be as follows: all wire of the same size furnished
to the same steel reinforcing specification that has been galvanized within
a single production shift.
6.2 Handling:
6.2.1 The identification of all reinforcing steel shall be
maintained throughout the coating and fabrication process to
the point of shipment.
TABLE 1 Mandrel Diameters for Test for Adherence of Zinc
Coating Inch-Pound Units [SI Units]
Mandrel Diameters of Coating Classes and Grades
Wire Diameter Regular and
Class 1
Class 3 or A,
4, B, 5, and
C
Grade 50,
60, 65, and
80
Under
0.148 [3.70]
1D
A
3D 3D
0.148 [3.70]
to
0.500 [12.7]
2D 4D 4D
over
0.500 [12.7]
3D 5D 5D
A
D = nominal wire diameter being tested.
A1060/A1060M − 22
2