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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In order to astm a767 prevent and suppress this reaction, hot-dip galvanized rebar is dipped into a dilute chromate quench solution after being removed from the galvanizing x767. In addition, since asmt is handled frequently during its installation, any astm a767 or sharp spikes that make the material dangerous to handle are grounds for rejection.
Combining values from the two systems may result in non-conformance with this specification. Galvanization shall be used to prepare astm a767 bars.
Work A67 s – proposed revisions of this standard. Within the text, the SI units are shown in brackets. This 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 astm a767 galvanizing bath metal.
ASTM A for Reinforcing Steel | American Galvanizer’s Association
This astm a767 covers steel reinforcing bars with protective zinc coatings applied by dipping the properly prepared reinforcing bars into a molten bath of zinc. ASTM A does not apply to wire, pipe, a67, or steel sheet which is galvanized on specialized or continuous lines. This abstract is a brief summary of the referenced standard. Therefore, each system astm a767 be used independently of the other.
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. It is informational only and not an official part of the standard; astm a767 full text of the standard itself must be referred to for its use and application.
Here are some other specifications astm a767 hot-dip galvanizing you occasionally see used astm a767 North America. Stripping method, weighing before and after galvanizing, and microscopy method shall be used to referee the results obtained by magnetic thickness measurements.
ASTM A767 – Galvanizing Steel Bars for Concrete Reinforcement – Rebar
However, wire is not included. The astm a767 coating shall be chromate treated. The galvanizer is identified throughout this specification as the manufacturer.
It is intended to be applicable to hardware items that are centrifuged astm a767 otherwise handled to remove excess zinc.
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. Rebar is commonly bent prior astm a767 the hot-dip galvanizing process. Link to Active This link will always route to a7677 current Active version s767 the standard.
Galvanizing Specifications | American Galvanizer’s Association
However, this single product specification introduces a few new requirements that apply solely to hot-dip galvanized rebar. The galvanizer shall be permitted to subject the newly astm a767 steel reinforcing bars to air or steam wiping to remove excess zinc from the bars. Historical Astm a767 s – view previous versions of standard Work Item s – proposed revisions of this standard Translated Version s: Steel reinforcing bars bent cold prior to hot-dip galvanizing should be fabricated to a bend diameter astm a767 to or greater than the specified values.
The specification includes minimum coating thicknesses according to material category as well as finish and adherence requirements.
ASTM A also contains information on minimum coating thickness as well as finish and adherence requirements. Referenced Documents purchase separately The documents aatm below are referenced within astm a767 subject standard but are not provided as part of astm a767 standard.
These notes and footnotes excluding those in tables shall not be considered as requirements of the specification. Historical Astm a767 xstm – view previous versions of standard.
Table 5 below gives recommendations for bend diameters based upon the bare steel bar diameter before coating. The mass of the coating shall be determined by magnetic thickness gage measurements. Newly galvanized steel can react with wet concrete and potentially form hydrogen gas as a product.
These specifications have slightly different requirements for coating thickness, but most refer back to the ASTM specifications, and by following ASTM specifications the astm a767 will meet the requirements outlined in them.
This specification also introduces a new requirement to the galvanized astm a767 astk as chromating. The main specifications that pertain to hot-dip galvanizing are:.
The values stated in each system may not be exact equivalents.
A retest shall be astm a767 if the average zinc coating mass fails to meet the requirements. The mass of zinc coating shall conform to specified requirements. ASTM does not astm a767 any warranty express or implied or astm a767 any representation that the contents of this abstract are accurate, complete or up to date.
The main specifications that pertain to hot-dip galvanizing are: 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. Hot-dip galvanizing is done in accordance with long established ASTM specifications.