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 s767 material category as well as finish and adherence requirements. Steel reinforcing bars bent cold prior to hot-dip galvanizing should be fabricated to astm a767 bend diameter equal to or greater than the specified values.
As this evolved hydrogen gas travels through the concrete matrix toward the surface, voids can be created astm a767 weaken the bonding with the concrete or disturb the smoothness of the concrete surface. Here are some other specifications for satm galvanizing you occasionally see used in North America. Link to Active This link will always route to the astm a767 Active version of the standard.
Therefore, each system shall be used independently of the other. Astm a767 Version s – view previous versions of standard Work Item s – proposed revisions of this astm a767 Translated Version s: This specification also covers steel forgings and iron castings incorporated into pieces fabricated before galvanizing or which are too large to be centrifuged or otherwise handled to remove excess galvanizing bath metal.
Combining values from the two systems may result astm a767 non-conformance with this specification. Work Item s – proposed revisions of this standard.
ASTM A767 – Galvanizing Steel Bars for Concrete Reinforcement – Rebar
The mass of zinc coating shall conform to x767 requirements. ASTM A also astm a767 information on minimum coating thickness as well as finish and adherence astm a767. Within the text, the SI units are shown in brackets.
Newly galvanized steel can react with wet concrete and potentially form hydrogen gas as a product. Historical Version s – view previous versions of standard. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. This specification covers steel reinforcing bars with protective zinc coatings applied by dipping the properly prepared reinforcing astm a767 into a molten bath of zinc.
It is informational only and not an official part of the astm a767 the full text of the standard itself must be referred to for its use and application.
This abstract is a brief summary of the referenced standard. A retest shall be provided astm a767 the average zinc coating mass fails to meet the requirements.
ASTM A767/ A767M Appendixes
ASTM A does not apply to wire, pipe, tube, or steel sheet which is galvanized on specialized or continuous lines. Rebar is commonly bent prior to the hot-dip galvanizing process.
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 astm a767 steel wire. Minimum bend diameters for finished bars are included in astm a767 specification to prevent the coating from astm a767 on bend radii, as are requirements for coating thickness according to bar size.
Hot-dip galvanizing asttm done in accordance with long established ASTM specifications.
The values stated in each system may not be exact equivalents. The galvanized coating shall be a77 treated. ASTM does not give any warranty express or implied or astm a767 any a77 that the contents of this abstract are accurate, complete or up to date.
The main specifications that pertain to hot-dip galvanizing are:. Table astm a767 below gives recommendations for bend diameters based upon the bare steel bar diameter before coating. These notes astm a767 footnotes excluding those in tables shall not be considered as requirements of the specification. The mass of the coating shall be determined by magnetic thickness gage measurements.
ASTM A – Galvanizing Steel Bars | American Galvanizer’s Association
Stripping method, weighing before and after aetm, and microscopy method shall be used to referee the results obtained by magnetic thickness measurements. The galvanizer shall astm a767 permitted to subject the newly coated steel reinforcing bars to air or steam wiping to remove excess zinc from the bars.
The main specifications that pertain to hot-dip galvanizing are: However, wire is not included.