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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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.
Finally, the adherence requirement is for the entire coating to have a strong adherence throughout the service life asgm the galvanized steel.
This specification covers steel reinforcing bars with protective zinc coatings applied by dipping the properly prepared reinforcing bars into a molten bath of zinc. There are coating thickness minimums, but no maximums, and the asrm are not subject to the coating thickness requirement.
ASTM A767 – Galvanizing Steel Bars for Concrete Reinforcement – Rebar
Therefore, each system shall be used independently of the other. Unique to this specification is also the requirement the galvanized bars be immersed in a heated, sodium dichromate solution a677 after the process. This abstract is a brief summary of the referenced standard. Leave this field blank. Number 12 and smaller bar must have a minimum of 3.
The following can cause warpage and distortion: See Specifying Duplex Systems for more information. 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 sstm which has high future costs. This specification covers rolled steel structural shapes for use in building framing or bridges, or for general structural purposes.
They can only be used if the electrical conductivity of the coating differs significantly from that of the substrate. 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.
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. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided aetm part of the standard.
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 a677 general structural purposes. 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 requirements of this specification are very similar to those in A, except for the addition of threaded products and embrittlement requirements.
ASTM Specifications | American Galvanizer’s Association
The material categories covered in the specification include structural steel and plate, strips and bars, pipes and tubing, and wires. The specification also calls out specific recommended before galvanizing bending radii. The values stated in each system may not be exact equivalents. It is the responsibility of the designer and fabricator qstm ensure the product has been properly designed and built before the hot-dip galvanizing process supporting specifications.
Combining values from the two systems may result in non-conformance asttm this specification.
Work Item s – x767 revisions of this standard. Stripping method, weighing before and after galvanizing, and microscopy method shall be used to referee the results obtained by magnetic thickness measurements. The specification requirements for coating thickness only contain minimums, there is no maximum coating thickness limitation in the specification.
The requirements in the specification facilitate the production of a high-quality zinc coating and are similar to those found in A and A This specification covers the requirements for hot-dip zinc coating applied to carbon steel and alloy steel bolts, screws, washers, nuts, and special threaded fasteners applied by the hot-dip coating process.
The following is a summary of the various pertinent hot-dip galvanizing specifications. 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. Rebar is commonly bent prior to galvanizing, and the recommendations for diameter and best practices are provided in A Types of embrittlement commonly encountered with galvanized steel are related to aging phenomena, cold working, and absorption of hydrogen.
Anyone making use of this information assumes all liability arising from such use. If rebar is bent fabricated after the galvanized coating is applied and any flaking or cracking occurs, it is not rejectable. First, the specification details the coating thickness requirements based on bar size.