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.
|Country:||Sao Tome and Principe|
|Published (Last):||7 July 2013|
|PDF File Size:||1.28 Mb|
|ePub File Size:||19.92 Mb|
|Price:||Free* [*Free Regsitration Required]|
Table 5 below gives recommendations for bend diameters based upon the bare steel bar diameter before coating.
However, wire is not included. The mass of the coating shall be determined by astm a767 thickness gage measurements. 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 size.
Astm a767 specification includes minimum coating thicknesses according to material category as well as finish and adherence requirements. 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.
A retest shall be provided if the average zinc astm a767 mass fails to meet the requirements. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided astm a767 part astm a767 the standard. ASTM does not give any warranty express or implied or make astm a767 representation that the contents of this abstract are accurate, complete or up to date. ASTM A also contains information on minimum coating thickness as well as finish and adherence requirements.
Historical Version s – view previous versions of standard. 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. The mass of zinc coating shall conform to specified requirements.
ASTM A767 for Reinforcing Steel
Here are some other specifications for q767 galvanizing you occasionally see used in North America. Within the text, the Astm a767 units are shown in brackets. Combining values from the two systems may result in non-conformance with this specification.
Work Item s – proposed revisions of this standard. The galvanizer is identified throughout this specification as the astm a767. Galvanization shall be used to prepare reinforcing bars. However, this single product specification introduces a few new requirements that apply solely to hot-dip galvanized rebar.
ASTM Aetm does not apply to wire, pipe, tube, or steel sheet which is galvanized on specialized or continuous lines. Historical Astm a767 s – view previous versions of standard Work Item s – proposed revisions of this standard Translated Version s: Newly galvanized steel can react with astm a767 concrete and potentially form hydrogen gas as a product.
ASTM A – Galvanizing Steel Bars | American Galvanizer’s Association
The galvanized coating shall be chromate astm a767. The values stated in each system may not be exact equivalents. This abstract is a brief summary of the referenced standard.
Asgm method, astm a767 before and after galvanizing, and microscopy method shall be used to referee the results obtained by magnetic thickness measurements. Rebar is commonly bent prior to the hot-dip galvanizing process.
In addition, since rebar is handled frequently during its installation, any tears or sharp spikes that make the material dangerous to handle are grounds astm a767 rejection.
astm a767 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. Therefore, each system shall be used independently of the other. These notes and footnotes excluding those in tables shall not be considered as requirements of the specification. It is informational only and not an astm a767 part of the standard; the full text of the standard itself must be referred to for its use and application.
Astm a767 specification also covers steel forgings and iron castings incorporated into pieces fabricated before astm a767 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 astm a767 the surface, voids can be created which weaken the bonding astm a767 the concrete or disturb the smoothness of the concrete surface.
Link to Active This link will always route to the current Active version of the standard. This specification also introduces a new requirement to the galvanized coating known as chromating.
This specification covers steel reinforcing bars with protective zinc 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 astm a767 handled to remove excess zinc.
Galvanizing Specifications | American Galvanizer’s Association
Hot-dip galvanizing is done in accordance with long established ASTM specifications. The main specifications asm pertain astm a767 hot-dip galvanizing are: In order to help prevent and suppress this reaction, hot-dip galvanized rebar is dipped into a astm a767 chromate quench solution after being removed from the galvanizing kettle. 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.
The main specifications that pertain to hot-dip galvanizing are:.