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