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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Standard Specification for Zinc Coating Hot-Dip on Iron and Hardware applies to hardware products such as castings, fasteners, rolled, pressed, and forged products, and miscellaneous threaded objects that will be centrifuged, qstm, or otherwise handled to remove the excess zinc.
Whenever different analyses of steel or different surfaces of steel are united in an assembly the galvanized finish is not generally uniform in appearance.
ASTM Specifications | American Galvanizer’s Association
A retest shall be provided if the average zinc coating mass fails to meet the requirements. Finally, there are requirements for passivating the material chromating to prevent reaction between concrete and the zinc coating, and on bend diameters. The requirements of this specification are very similar to those in A, except for the addition of threaded products and embrittlement requirements.
The adherence requirement is the same as A, for strong bond throughout the life of the hot-dip galvanized steel. LME grade, special high grade, high grade, intermediate grade, and prime western grade. Assemblies should consist of elements of similar chemistry and surface condition. 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 specification also calls out specific recommended before galvanizing bending radii. 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 ast and resolve the issue with the customer.
Unique to this specification is also the requirement the galvanized bars be immersed in a heated, sodium dichromate solution immediately after the process.
All fabricated assemblies shall be designed with vent and 7a67 holes such that no air is trapped during immersion of the assemblies into cleaning solutions or molten zinc.
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. Number 12 and smaller bar must have a minimum of 3. 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.
Embrittlement is the loss or partial loss of ductility in a steel where an embrittled product characteristically fails by fracture without appreciable deformation.
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.
ASTM A – Galvanizing Steel Bars | American Galvanizer’s Association
The material provided a67 has been developed to provide accurate and authoritative information about after-fabrication hot-dip galvanized steel. 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. Specification for Structural Steel.
ASTM A767 – Galvanizing Steel Bars for Concrete Reinforcement – Rebar
However, the AGA does provide a compilation of specifications pertinent to galvanizing. Standard Specification for Zinc Hot-Dip Galvanized Aztm on Iron and Steel Products covers individual steel pieces as well as assemblies of various classes of material. Within the text, the SI units are shown in brackets. These notes and footnotes excluding astmm in tables shall not be considered as requirements of the specification. Was this answer helpful? Galvanization shall be used to prepare reinforcing bars.
This specification covers cold-formed welded and seamless carbon steel round, square, rectangular, or special shape structural tubing for welded, riveted, or bolted construction of bridges and buildings, and for general structural purposes. This tubing shall be produced in both welded and seamless sizes and must have the chemical requirements of carbon, manganese, phosphorus, sulfur, and copper. 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.
Finally, the adherence requirement is for the entire coating to have a strong adherence throughout the service life of the galvanized steel. The mass of aa767 coating shall conform to specified requirements.
See Specifying Duplex Systems for more information. 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. The material categories covered in the specification include structural steel and plate, strips and bars, pipes and tubing, and wires.