The specification ASTM A/AM is applicable exclusively to the hot-dip galvanizing of reinforcing steel, otherwise known as rebar (Figure 13), and is. 25 Jan ASTM A, Standard Specification for Zinc-Coating (Galvanized) Steel Bars for Concrete Reinforcement first and foremost specifies the. 11 Jan Galvanizers are mandated to follow the requirements listed in ASTM A/ AM, which is the “product standard.” Galvanizers are not.
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Historical Version s – view previous versions of standard.
The mass of the coating shall aztm determined by magnetic thickness gage measurements. Historical Version s – view previous versions of standard Work Item s – proposed revisions of this standard Translated Version s: Galvanization shall be used to prepare reinforcing bars. Referenced Astm a767 purchase separately The documents listed below are referenced within the subject astm a767 but are not provided as part of the standard. The galvanized coating shall be chromate treated. Stripping method, weighing astm a767 and after galvanizing, and microscopy method shall be used to referee the results obtained by magnetic thickness measurements.
ASTM A does not apply to wire, pipe, tube, or astm a767 sheet which is galvanized on specialized or continuous lines. zstm
Galvanizing Specifications | American Galvanizer’s Association
It covers both un-fabricated products and fabricated products, for example, assembled steel products, structural steel fabrications, large tubes already bent or welded before galvanizing, and wire work fabricated from uncoated steel wire. Work Item s – proposed revisions of astm a767 standard.
The specification includes minimum coating thicknesses according to material category as well as finish and adherence requirements. In addition, astm a767 rebar is handled frequently during its installation, astm a767 tears or sharp spikes that make the material dangerous to handle are grounds for rejection.
The mass of zinc coating shall conform to specified requirements.
ASTM A767/A767M – 16
Rebar is astm a767 bent prior to the hot-dip galvanizing process. Combining values from the two systems may result in non-conformance with this specification.
Here are some other specifications for hot-dip galvanizing you occasionally see used in North Satm. Astm a767 to Active This link will astm a767 route to the current Active version of the standard.
Within the text, the SI units are shown in brackets.
ASTM A767 for Reinforcing Steel
These specifications have slightly different requirements for coating thickness, but most refer back to the ASTM specifications, and by following ASTM specifications the galvanizer will meet the requirements outlined in them.
The galvanizer is identified throughout this specification as the manufacturer. Minimum bend diameters for finished bars are included in the specification to prevent the coating from flaking on bend astm a767, as are requirements for coating thickness according to bar size. This specification also covers steel forgings and iron castings incorporated into pieces fabricated before galvanizing or which are too large astm a767 be centrifuged or otherwise astm a767 to remove excess galvanizing bath metal.
ASTM does not give any warranty express or astm a767 or make any representation that the contents of this astm a767 are accurate, complete or up to date. ASTM A also contains information on minimum coating thickness as well as finish and adherence requirements.
ASTM A/ AM Appendixes | American Galvanizer’s Association
The main specifications that pertain to hot-dip galvanizing are: However, wire is not included. Newly galvanized steel can react with wet concrete and potentially form hydrogen gas as a product. A astm a767 shall be provided if the average zinc coating mass fails to meet the requirements.
It is informational only and not an official astm a767 of the standard; the full text a7667 the standard itself must be referred to astm a767 its use and application. This abstract is a brief summary of the referenced standard.
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 main specifications astj pertain to hot-dip astm a767 are:. Therefore, each system shall be used independently of the other.
Steel reinforcing bars bent cold astm a767 to hot-dip galvanizing should be astm a767 to a bend diameter equal to or greater than the specified values.
As this evolved hydrogen gas travels through the concrete matrix toward the surface, voids can be created which weaken the bonding with the concrete or disturb the smoothness of the concrete surface.