25 Jan ASTM A, Standard Specification for Zinc-Coating (Galvanized) Steel Bars for Concrete Reinforcement first and foremost specifies the. ASTM A/AM: Standard Specification for Zinc-Coated (Galvanized) Steel Bars for Concrete Reinforcement. ASTM A – Download as PDF File .pdf), Text File .txt) or read online. ASTM A
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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. However, this single product specification introduces a few new requirements that apply solely to hot-dip galvanized rebar. Unique to this specification is also the requirement the galvanized bars be immersed in a heated, sodium dichromate solution immediately after the process. Link to Active This link will always route to the current Active version of the standard.
A retest shall be provided if the average zinc coating mass fails aa767 meet the requirements. This specification covers steel reinforcing bars with protective zinc coatings applied by dipping the properly prepared reinforcing bars into a molten bath of zinc.
Therefore, each system shall be used independently of the other. 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. Historical Version s – view previous asttm of standard Work Item s – proposed revisions of this standard Translated Version s: Table adtm below gives recommendations for bend diameters based upon the bare steel bar diameter before coating.
The material provided herein has been developed to provide accurate and authoritative information about after-fabrication hot-dip galvanized steel.
January 25, Authored by Dr. This specification also introduces a new requirement to the galvanized coating known as chromating. 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. Anyone making use of this information assumes all liability arising from such use.
Rebar is commonly bent prior to the hot-dip galvanizing process. These notes and 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. Stripping method, weighing before and after galvanizing, and microscopy method shall be used to referee the results obtained by magnetic thickness measurements. This abstract is a brief summary of the referenced standard. This material provides general information only and is not intended as a substitute for competent professional examination and verification as to suitability and applicability. This post-treatment helps to prevent the formation of wet storage stain on the bars when they are in bundles at a job site and also promotes good adhesion of the galvanized rebar to the concrete it is placed in.
Historical Version s – view previous versions of standard. The specification also calls out specific recommended before galvanizing bending radii. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.
ASTM A767 – Galvanizing Steel Bars for Concrete Reinforcement – Rebar
The mass of zinc coating shall conform to specified requirements. In order to help prevent and suppress this reaction, hot-dip galvanized rebar is a7677 into a dilute chromate quench solution after being removed from the galvanizing kettle. Was this answer helpful? It is important to note reinforcing steel used in conjunction with structural steel, welded to a fabricated assembly is not governed by ASTM A but rather ASTM A, the standard specification for zinc coatings on iron and steel products.
ASTM A767/A767M – 16
Newly galvanized steel can react with wet concrete and potentially form hydrogen gas as a product. This cold working of the bars causes induced stresses that may be released after the bars are immersed in the molten F zinc bath. Are a76 still looking for the right answer? Work Item s – proposed revisions of this standard.
It is informational only and not an official part of the standard; the full text 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
Within the text, the SI units are shown in brackets. The information provided herein is not intended as a representation or warranty on the part of the AGA. Combining values from the two systems may result in non-conformance with this specification.
Number 12 and smaller bar must have a minimum of 3. Leave this a67 blank.
However, wire is not included. ASTM does not give any warranty express or implied or make any representation that the contents of this abstract are accurate, complete or up to date. The galvanizer shall be permitted to subject the newly coated steel reinforcing bars to air or steam wiping z767 remove excess zinc from the bars.
The galvanized coating shall be chromate treated. The values stated in each system may not be exact equivalents. The galvanizer is identified throughout this specification as the manufacturer.