Number 12 and smaller bar must have a minimum of 3. The specification also calls out specific recommended before galvanizing bending radii. This cold working of the bars causes induced stresses that may be released after the bars are immersed in the molten F zinc bath. Unique to this specification is also the requirement the galvanized bars be immersed in a heated, sodium dichromate solution immediately after the process. This post-treatment helps to prevent the formation of wet storage stain on the bars when they are in bundles at a job site and also promotes good adhesion of the galvanized rebar to the concrete it is placed in.
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Ordering Information 3. Such requirements shall include, but are not limited to, the following: 3. After the wiping, the coated steel reinforcing bars shall meet the minimum coating mass [weight]. N OTE 2—During the wiping process, care should be taken to maintain a uniformly thick coating around the perimeter of the bar.
No further reproductions authorized. The mass [weight] of zinc coating based on actual area of the bar shall conform to the requirements shown in Table 1.
N OTE 3—The nominal diameter of a deformed bar is equivalent to that of a plain round bar having the same mass per metre [weight per foot] as the deformed bar. Coating mass [weight] shown in is based on an assumed area ratio of 1. The thickness measurement is used to calculate the mass [weight] by multiplying it by the surface area of coated bar and by the zinc density. One or more of the following methods shall be permitted to be used to referee the results obtained by magnetic thickness measurements.
N OTE 4—This is a destructive test appropriate for small samples of a minimum of mm 2 [3 in. The difference between the two measurements divided by the surface area of the bars provides the mass [weight]. The original weighing shall occur after pickling and drying.
The second weighing shall occur after cooling to ambient temperature. A cross-section sample of the steel shall be polished and examined with an optical micro- scope to determine the coating thickness. The coating mass [weight] shall be determined by multiplying coating thickness by the surface area of the coated sample and by the density of zinc. Each sample shall be measured on four sides and the total of twenty measurements shall be averaged to obtain the coating thickness.
For the stripping method and the weighing method, three samples per lot shall be measured.
Ordering Information 3. Such requirements shall include, but are not limited to, the following: 3. After the wiping, the coated steel reinforcing bars shall meet the minimum coating mass [weight]. N OTE 2—During the wiping process, care should be taken to maintain a uniformly thick coating around the perimeter of the bar. No further reproductions authorized. The mass [weight] of zinc coating based on actual area of the bar shall conform to the requirements shown in Table 1.
ASTM A767 for Reinforcing Steel
More A Galvanization shall be used to prepare reinforcing bars. The galvanizer shall be permitted to subject the newly coated steel reinforcing bars to air or steam wiping to remove excess zinc from the bars. The mass of zinc coating shall conform to specified requirements.
ASTM A767 - Galvanizing Steel Bars for Concrete Reinforcement - Rebar
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