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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ASTM A – Galvanizing Steel Bars | American Galvanizer’s Association
Was this answer helpful? The galvanizer is identified throughout this specification as the manufacturer. Are you still looking for the right answer? This cold working of the bars causes induced stresses that may be released after the bars are immersed in the molten F zinc bath. The material provided herein has been developed to provide accurate and authoritative information about after-fabrication hot-dip galvanized steel.
A retest shall be provided if the average zinc coating mass fails to meet the requirements.
Rebar is commonly bent prior to the hot-dip galvanizing process. This specification also introduces a new requirement to the galvanized coating known as chromating. 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 A767/A767M – 16
Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. Galvanization shall be used to prepare reinforcing bars. Newly galvanized steel can react with wet concrete and potentially form hydrogen gas as a product. Number 12 and smaller bar must have a minimum of 3. January 25, Authored by Dr. Anyone making use of this information assumes all liability arising from such use.
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 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.
The galvanized coating shall be chromate treated. This material provides general information only and is not intended as a substitute for competent professional examination and verification as to suitability and applicability.
ASTM A767 for Reinforcing Steel
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. Link to Active This link will always route to the current Active version of the standard. In order to help prevent and suppress this reaction, hot-dip galvanized rebar is dipped into a dilute chromate quench solution after being removed from the galvanizing kettle.
ASTM does not give any warranty express or implied asgm make any representation that the contents of this abstract are accurate, complete or up to date. Historical Version s – view previous versions of standard Work Item s – proposed revisions of this standard Translated Version s: Unique to qstm specification is also the a76 the galvanized bars be immersed in a heated, sodium dichromate solution immediately after the process.
ASTM A for Reinforcing Steel | American Galvanizer’s Association
The mass of zinc coating shall conform to specified requirements. 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. 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.
Combining values from the two systems may result in non-conformance with this specification. Stripping method, weighing before and after galvanizing, and microscopy method shall be used to referee the results obtained by magnetic thickness measurements.
Leave this field blank. Within the text, the SI units are shown in brackets. 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.
The information provided herein is not intended as a representation or warranty on the part of the AGA. Therefore, each system shall be used independently of the other. The mass of the coating shall be determined by magnetic thickness gage measurements.
These notes and footnotes aatm those in tables shall not be considered as requirements of the specification.
In addition, since z767 is handled frequently during its installation, any tears or sharp spikes that make the material dangerous to handle are grounds for rejection. However, wire is not included. Table 5 below gives recommendations for bend diameters based upon the bare steel bar diameter before coating. The specification also calls out specific recommended before galvanizing bending radii.
Work Item sstm – proposed revisions of this standard. This abstract is a brief summary of the referenced standard. Historical Version s – view previous versions of standard.