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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The LCC analysis considers not only the initial cost of the system but also the future costs maintenance, replacement, etc. The specification requirements for coating thickness only contain minimums, there is no maximum coating thickness limitation in the specification. Number 12 and smaller bar must have a minimum of 3. asym
It is the responsibility of the designer and fabricator to ensure the product has been properly designed and wstm before the hot-dip galvanizing process supporting specifications. The galvanizer is identified throughout this specification as the manufacturer.
Leave this field blank. 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.
The mass of zinc coating shall conform to specified requirements.
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. Was this answer helpful? Finally, the adherence requirement is for the entire coating to have a strong adherence throughout the service life of the galvanized steel. Asttm 25, Authored by Dr. Anyone making use of this information assumes all liability aastm from such use.
It may also be known by its trade name, e.
This material provides general information only and is not intended as a substitute for competent professional examination and verification as to suitability and applicability. The following can cause warpage and distortion: The galvanized coating shall be chromate treated.
Standard Specification a7767 Zinc. First, the specification details the coating thickness requirements based on bar size. Therefore, each system shall be used independently of the other. The material categories asfm in the specification include structural steel and plate, strips and bars, pipes and tubing, and wires. Assemblies should consist of elements of similar chemistry and surface condition.
Historical Version s – view previous versions of standard. This test method deals with the standard procedures for establishing the relative bond strength of steel reinforcing bars in concrete using beam-end specimens. If rebar is bent fabricated after the galvanized coating is applied and any flaking or cracking occurs, it is not rejectable. This test method shall determine the effects of surface preparation or condition such as bar coatings on the bond strength of deformed steel reinforcing bars to concrete.
Finally, there are requirements for passivating the material chromating to prevent reaction between concrete and the zinc coating, and on bend diameters.
Embrittlement is the loss or partial loss of ductility in a steel where an embrittled product characteristically fails by fracture without appreciable deformation.
The requirements in the specification facilitate the production of a high-quality zinc coating and are similar to those found in A and A Satm 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.
Within the text, the SI units are shown in brackets.
ASTM Specifications | American Galvanizer’s Association
A retest shall be provided if the average zinc coating mass fails to meet the requirements. This specification covers prime western grade-recycled PWG-R zinc made by recycling zinc secondary materials including but not limited to drosses and skimmings. 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.
The requirements of this specification are very similar to those in A, except for the addition of threaded products and embrittlement requirements. This specification covers black and hot-dipped galvanized hot-formed welded and seamless carbon steel square, round, rectangular, or special shape structural tubing for welded, riveted, or bolted construction or bridges and buildings, and for general structural purposes.
LME grade, special high grade, high grade, intermediate grade, and prime western grade. 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.
ASTM A – Galvanizing Steel Bars | American Galvanizer’s Association
Are you still looking for the right answer? 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.
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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. Heat analysis shall be used to determine the percentage of carbon, manganese, phosphorus, sulfur, vanadium, nickel, chromium, molybdenum, columbium, and copper asstm the required chemical composition.