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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The specification includes minimum coating thicknesses according to material category as well as finish and adherence requirements. Minimum bend diameters for finished bars are included in the specification to prevent the coating from flaking on bend radii, as are requirements for coating thickness according to bar astm a767.
Hot-dip galvanizing is done in accordance with long astm a767 ASTM specifications. Work Item s – proposed revisions of this standard. Steel reinforcing bars bent cold prior to hot-dip galvanizing should be fabricated to a bend diameter equal to or greater than the specified values.
Referenced Documents purchase separately The documents listed below astm a767 referenced within the subject standard astm a767 are not provided as part of the standard. However, this single product specification introduces a few new requirements that apply solely to hot-dip galvanized rebar. ASTM does not give any warranty express or implied or make any representation that the contents of this abstract are accurate, complete or up to date.
ASTM A for Reinforcing Steel | American Galvanizer’s Association
This abstract is a brief summary of the referenced astm a767. The galvanizer is identified throughout this specification as the manufacturer.
In addition, since rebar is handled frequently during its installation, any tears or sharp spikes that make astm a767 material dangerous to handle are astm a767 for rejection. Therefore, each system shall be used independently of the other.
Combining values from the two systems may result in non-conformance with this specification. The main specifications that pertain to astm a767 galvanizing are: 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.
This specification also introduces a new requirement to the galvanized coating known as chromating.
These notes and footnotes excluding those in tables astm a767 not be considered as requirements of the specification. The galvanized coating shall be chromate treated.
Link to Active This link will always astm a767 to the current Active version of the standard. The astm a767 of zinc coating shall conform to specified requirements. Galvanization shall be used to prepare reinforcing bars.
A retest shall be provided if the average zinc coating mass fails to meet the requirements.
ASTM A767 – Galvanizing Steel Bars for Concrete Reinforcement – Rebar
The galvanizer shall be permitted to subject the newly coated steel reinforcing astm a767 to air or steam wiping to remove excess zinc from the bars. ASTM A also contains information on minimum coating astm a767 as well as finish and adherence requirements.
This specification also covers steel forgings and iron astm a767 incorporated into pieces fabricated before galvanizing or which are too large to be centrifuged or otherwise a7677 to remove excess galvanizing bath metal.
ASTM A does not astm a767 to wire, pipe, tube, or steel sheet which is galvanized on specialized or continuous lines.
ASTM A767/ A767M Appendixes
Stripping method, weighing before and after galvanizing, and microscopy method shall be used to referee the results obtained by magnetic thickness measurements. However, wire is not included. These specifications have slightly different requirements for coating ast, but most refer back astm a767 the ASTM specifications, and by following ASTM specifications the galvanizer will meet the requirements outlined in them. It covers both un-fabricated products and fabricated products, for example, assembled steel products, structural steel fabrications, large tubes astm a767 bent or welded before galvanizing, and wire work fabricated from uncoated steel wire.
Historical Version s – view previous versions of standard Work Item s – proposed revisions of this standard Translated Version s: Here wstm some other specifications for hot-dip galvanizing you occasionally see used in North America. This specification covers steel reinforcing bars with protective astm a767 coatings applied by dipping the properly prepared reinforcing bars into a molten bath of zinc.
It is intended to be applicable to hardware items that are centrifuged or otherwise handled to remove excess zinc. Newly astm a767 steel can react astm a767 wet concrete and potentially form hydrogen gas as a product.