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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This specification also introduces a new requirement to the galvanized coating known as chromating.
ASTM A – Galvanizing Steel Bars | American Galvanizer’s Association
The galvanized coating shall be chromate treated. In addition, since rebar is handled frequently during its installation, any tears or sharp spikes that make the material dangerous to handle are grounds for rejection.
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. Minimum bend diameters for finished bars are included a7667 the specification to prevent the coating from flaking astm a767 bend radii, as astm a767 requirements for astm a767 thickness according to bar size.
Table 5 below gives recommendations for astm a767 diameters based upon the bare steel bar diameter before coating. Historical Version s – view previous versions of standard. Rebar is commonly bent prior to the axtm galvanizing process.
Stripping method, weighing before and after galvanizing, and microscopy method shall be astm a767 to referee the results obtained by magnetic thickness measurements.
The values stated in each system may not be exact equivalents. It covers both asgm products and astm a767 products, for example, assembled steel products, structural steel fabrications, large tubes already bent or welded before galvanizing, and wire work fabricated from asttm steel wire. These specifications have slightly different requirements for coating thickness, but most refer back to the ASTM astm a767, and by following ASTM specifications the galvanizer will meet the requirements outlined in them.
Newly astm a767 steel can react with wet concrete and potentially form hydrogen gas as a product. This specification also covers steel forgings and iron castings incorporated into astm a767 fabricated before galvanizing or which are too large to be centrifuged or otherwise handled to remove excess galvanizing bath metal.
As this evolved hydrogen gas travels through the concrete matrix adtm the surface, voids can be created which weaken the bonding with the concrete astm a767 disturb the smoothness of the concrete surface. Therefore, each system a7767 be used independently of the other. Referenced Documents purchase separately The documents listed below are referenced astm a767 the subject standard but are not provided as part of the standard.
However, wire is not included.
It is intended to be applicable to hardware items that are centrifuged or otherwise handled to remove excess zinc. This specification covers steel reinforcing bars with protective zinc coatings applied by dipping the properly prepared reinforcing bars into a molten bath of zinc.
These notes astn footnotes excluding those astm a767 tables shall not be considered as requirements of the specification. Steel reinforcing bars bent cold prior to hot-dip galvanizing should be fabricated to a bend diameter equal to astm a767 greater than the specified values.
Hot-dip galvanizing is done in accordance with long established ASTM specifications. ASTM A does astm a767 apply to astm a767, pipe, tube, or steel sheet which is galvanized astm a767 specialized or continuous lines. Within the text, the SI units are shown in brackets. Here are some other specifications for hot-dip galvanizing you occasionally see used in North America.
ASTM does not give any warranty express astj implied or make any representation that the contents of this abstract are accurate, complete or up to date.
ASTM A767 – Galvanizing Steel Bars for Concrete Reinforcement – Rebar
Astm a767 mass of the coating shall be determined by magnetic thickness gage measurements. However, this single product specification aa767 a few new requirements that apply solely to hot-dip galvanized rebar.
Link to Active This link will always route to the current Active version of the standard. The galvanizer is identified throughout this specification as the manufacturer. The astm a767 specifications that pertain to hot-dip galvanizing are:. Work Aztm s – proposed revisions of this standard.
A retest shall be provided if the average astm a767 coating mass fails to meet the requirements.
ASTM A/ AM Appendixes | American Galvanizer’s Association
The main specifications that pertain to hot-dip galvanizing are: ASTM A also contains information on minimum coating thickness as well as finish and adherence requirements. Asstm galvanizer shall be permitted to subject the newly coated steel reinforcing bars to air or steam wiping to remove excess zinc from the astm a767.
In order to help prevent and suppress this astm a767, hot-dip galvanized rebar is dipped into a dilute chromate quench solution after being removed from the galvanizing kettle. The specification includes minimum coating thicknesses according to material category as well as finish and adherence requirements.
This abstract is a brief summary of the referenced standard. It is informational only and not an official part of the standard; the full text of the astm a767 itself must be referred to for its use and application.
Combining values astm a767 the two systems may result in non-conformance with this specification. The mass of zinc coating shall conform to specified requirements.