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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However, the AGA does provide a compilation of specifications pertinent to galvanizing.
ASTM A – Galvanizing Steel Bars | American Galvanizer’s Association
Whenever different analyses of steel or different surfaces of steel are united in an assembly the galvanized finish is not generally uniform in appearance. Embrittlement is the loss or partial loss of ductility in a steel where an embrittled product characteristically fails by fracture without appreciable deformation.
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, spun, or otherwise handled to remove the excess 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.
Heat analysis shall be used to determine the percentage of carbon, manganese, phosphorus, sulfur, vanadium, nickel, chromium, molybdenum, columbium, and copper for the required chemical composition. Leave this field blank.
ASTM A767 – Galvanizing Steel Bars for Concrete Reinforcement – Rebar
These notes and footnotes excluding those in tables shall not be considered as requirements of the specification. Therefore, each system shall ast, used independently of the other.
KnowledgeBase What is EN ? The specification also calls out specific recommended before galvanizing bending radii. This practice is applicable to chromate coatings of the colorless both one and two-dipiridescent yellow or bronze, olive drab, black, colorless anodic, yellow or black anodic types, and of the dyed variety, when applied to surfaces of electrodeposited zinc, mechanically deposited zinc, hot-dipped zinc, rolled zinc, electrodeposited cadmium, or mechanically deposited coatings.
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. 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.
The LCC analysis considers not only the initial cost of the system but also the future costs maintenance, replacement, etc. Anyone making use of this information assumes all liability arising from such use.
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. Assemblies should consist of elements of similar chemistry and surface condition. The information provided herein is not intended as a representation or warranty on the part of the AGA.
The specification outlines three acceptable forms of touch-up: This test method deals with the standard procedures for establishing the relative bond strength of steel reinforcing bars in concrete using beam-end specimens. Common distorted and warped members of assemblies are sheets or plates assembled by welding or riveting.
First, the specification details the coating thickness requirements based on bar size. This specification covers rolled steel structural shapes for use in building framing or bridges, or for general structural purposes. The values stated in each system may not be exact equivalents. The adherence requirement is the same as A, for strong bond throughout the life of the hot-dip galvanized steel. The requirements in the specification facilitate the production of a high-quality zinc coating and are similar to those found in A and A The galvanized coating shall be chromate treated.
This specification covers the chemical, mechanical, and dimensional requirements for eight grades Grades O, A, B, C, D, DH, C3, and DH3 of carbon and alloy steel nuts for general structural and mechanical uses on bolts, studs, and other externally threaded parts. Inspector Listing – Non-U.
Finally, there are requirements for passivating the material chromating to prevent reaction between concrete and the zinc coating, and on bend diameters. The following can cause warpage and distortion: 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.
However, there are a few additional requirements for galvanized rebar.
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. Standard Specification for Zinc Hot-Dip Galvanized Coatings on Iron and Steel Products covers individual steel pieces as well as assemblies of various classes of material. LME grade, special high grade, high grade, intermediate grade, and prime western grade.
Fabrications can have more than one material category, such as a frame assembly. Finally, the adherence requirement is for the entire coating to asstm a strong adherence throughout the service life of the galvanized steel.
ASTM Specifications | American Galvanizer’s Association
Unique to this specification is also the requirement the galvanized bars be immersed in a heated, sodium dichromate solution immediately after the process. Are you still looking for the right answer? Historical Version s – view previous versions of standard Work Item s – proposed revisions of this standard Translated Version s: They can only be used if the electrical conductivity of the coating differs significantly from that of the substrate.