ASTM A/AM. Standard Specification for Zinc-Coated (Galvanized) Steel Bars for Concrete Reinforcement is exclusively applicable to hot-dip galvanizing . ASTM A/AM: Standard Specification for Zinc-Coated (Galvanized) Steel Bars for Concrete Reinforcement. ASTM A/AMa Testing Mechanical Splices for Steel Reinforcing Bars .. ASTM A/AM Zinc-Coated (Galvanized) Steel Bars for Concrete.
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Therefore, each system shall be used independently of the other. The purpose of the calculation is to provide justification for the purchase of a higher initial cost system with a low life-cycle cost over an initially less expensive coating which has high future costs.
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The material provided herein has been developed to provide accurate and authoritative information about after-fabrication hot-dip galvanized steel. Link to Active This link will always route to the current Active version of the standard. The requirements for finish, appearance, and adherence are identical to those in the other main standards. ASTM A Practice for Repair of Damaged and Uncoated Areas of HOt-Dip Galvanized Coatings covers appropriate methods used to repair damaged hot-dip galvanized coatings on hardware, structural shapes, and other hot-dip galvanized products, including uncoated areas remaining after initial hot-dip galvanizing.
Satm, the specification details the coating thickness requirements based on bar size. The requirements of this specification are very qstm to those in A, except for the addition of threaded products and embrittlement requirements.
Unique to this specification is also the requirement the galvanized bars be immersed in a heated, sodium dichromate solution immediately after the process. The information provided herein is not intended as a representation or warranty on the part of the AGA. It is the responsibility of the designer and fabricator to ensure the product has been properly designed and built before the hot-dip galvanizing process supporting specifications.
This specification covers carbon structural steel shapes, plates, and bars of structural quality for use in riveted, bolted, or welded construction of bridges and buildings, and for general structural purposes.
January 25, Authored by Dr. Standard Specification for Zinc.
Specification for Structural Steel. However, if the galvanizer has to perform additional work in order to prepare the product for hot-dip galvanizing, such as drilling holes to facilitate drainage or venting, the galvanizer will communicate and resolve the issue with the customer. Stripping method, weighing before and after galvanizing, and microscopy method shall be used to referee the results obtained by magnetic thickness measurements.
This specification covers steel reinforcing bars with protective zinc coatings applied by dipping the a7677 prepared reinforcing bars into a molten bath of zinc. The design of the product and selection of proper steel for its suitability to withstand normal galvanizing operations is the responsibility of the designer and fabricator. The values stated in each system may not be exact equivalents.
The mass of the coating shall be determined by magnetic thickness gage measurements. This tubing shall be produced in both welded and seamless sizes and must have the astj requirements of carbon, manganese, phosphorus, sulfur, and copper. The mass of zinc coating shall conform to specified requirements. Steel materials and nuts shall be manufactured, processed, and formed as appropriate for their respective grades.
Assemblies should consist of elements of similar chemistry and surface condition. Was this answer helpful?
ASTM A767 – Galvanizing Steel Bars for Concrete Reinforcement – Rebar
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 is identified throughout this specification as the manufacturer.
Leave this field blank. Common distorted and warped members of assemblies are sheets or plates assembled by welding or riveting. The requirements in the specification facilitate the production of a high-quality zinc coating and sstm similar to those found in A and A Requirements concerning the renovation of uncoated areas after initial hot-dip galvanizing are contained within the material specifications A, A, A Finally, there are requirements for passivating the material chromating to prevent reaction between concrete and the zinc coating, and on bend diameters.
ASTM A – Galvanizing Steel Bars | American Galvanizer’s Association
Galvanization shall be used to prepare reinforcing bars. 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. Whenever different analyses of steel or different surfaces of steel are united in an assembly the galvanized finish is not generally uniform in appearance. However, the AGA does provide a compilation of specifications pertinent to galvanizing. Eddy-current-type thickness measurement is a non-destructive test measuring variations in the impedance of an eddy-current inducing coil caused by coating thickness variations.
If rebar is bent fabricated after the galvanized coating is applied and any flaking or cracking occurs, it is not rejectable.
However, there are a few additional requirements for galvanized rebar. Standard Specification for Zinc Hot-Dip Galvanized Coatings on Atm and Steel Products covers individual steel pieces as well as assemblies of various classes of material. 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.
Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. Fabrications can have more than one material category, such as a frame assembly.
The following is a summary of the various pertinent hot-dip galvanizing specifications. See Specifying Duplex Systems for more information.
Work Item s – proposed revisions of this standard. LME grade, special high grade, high grade, intermediate grade, and prime western grade.
The adherence requirement is the same as A, for strong bond throughout the life of the hot-dip galvanized steel. Historical Version s – view previous versions of standard Work Item s – proposed revisions of this standard Translated Version s: The material categories covered in the specification include structural steel and plate, strips and bars, pipes and tubing, and wires.
They can only be used if the electrical conductivity of the coating differs significantly from that of the substrate. KnowledgeBase What is EN ? Practice for Repair of Damaged and Uncoated Areas of HOt-Dip Galvanized Coatings covers appropriate methods used to repair damaged hot-dip galvanized coatings on hardware, structural shapes, and other hot-dip galvanized products, including uncoated areas remaining after initial hot-dip galvanizing.
These notes and footnotes excluding those in tables shall not be considered as requirements of the specification.