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.
|Published (Last):||19 April 2015|
|PDF File Size:||8.44 Mb|
|ePub File Size:||17.97 Mb|
|Price:||Free* [*Free Regsitration Required]|
However, there are a few additional requirements for galvanized rebar. 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 asttm 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.
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.
Types of embrittlement commonly encountered with galvanized steel are related aastm aging phenomena, cold working, and absorption of hydrogen.
Link to Active This link will always route to the current Active version of the standard. Common distorted and warped members of assemblies are sheets or plates assembled by welding or riveting.
This specification covers zinc metal made from ore or other material by a process of distillation or by electrolysis in five grades as follows: Sstm requires a continuous, smooth, and uniform finish with no uncoated w767 including on the threads or issues that interfere with its intended use. The values stated in each system may not be exact equivalents. However, the AGA does provide a compilation of specifications pertinent to galvanizing.
Finally, there are requirements for passivating the material chromating to prevent reaction between concrete and the zinc coating, and on bend diameters.
The LCC analysis considers not only the initial cost of the system but also the future costs maintenance, replacement, etc. 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 galvanizer shall be permitted to subject the newly coated steel reinforcing bars to air or steam wiping to remove excess zinc from the bars.
The specification requirements for coating thickness only contain minimums, there is no maximum coating thickness limitation in the specification. They can only be used if the electrical conductivity of the coating differs significantly from that of the substrate.
KnowledgeBase What is EN ? Standard Specification for Zinc Coating Hot-Dip on Iron and Hardware applies to hardware products such as castings, fasteners, rolled, pressed, and axtm products, and miscellaneous threaded objects that will be centrifuged, spun, or otherwise handled to remove the excess zinc.
The specification also calls out specific recommended before galvanizing bending radii.
ASTM Specifications | American Galvanizer’s Association
Anyone making use of this information assumes all liability arising from such use. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. Rebar is commonly bent prior to galvanizing, and the recommendations for diameter and best practices are provided in A Whenever different analyses of steel or different surfaces of steel are united in an assembly the galvanized finish is not generally uniform in appearance.
The following can cause warpage and distortion: 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.
There are coating thickness minimums, but no maximums, and the threads are not subject to the coating thickness requirement. This specification covers rolled steel structural shapes for use in building framing or bridges, or for general structural purposes. 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.
Purchase a copy from the AGA, or contact your local galvanizer. Finally, the adherence requirement is for the entire coating to have a strong adherence throughout the service life of the galvanized steel. This test method deals with the standard procedures for establishing the relative bond strength of steel reinforcing bars in concrete using beam-end specimens.
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. This specification covers steel reinforcing bars with protective zinc coatings applied by dipping the properly prepared reinforcing bars into a molten bath of zinc. Within the text, the SI units are shown in brackets.
Any combination of these products can be assembled into a single fabrication and then hot-dip galvanized.
The specification outlines three acceptable forms of touch-up: 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 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.
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 material provided herein has been developed to provide accurate and authoritative information about after-fabrication hot-dip galvanized steel. This test method shall determine the effects of aatm preparation or condition such as bar coatings on the bond strength of deformed steel reinforcing bars to concrete.
Embrittlement is the loss or partial loss of ductility in a steel where an embrittled product characteristically fails by fracture without appreciable deformation. It may also be known by its trade name, e. The galvanized coating shall be chromate treated. Fabrications can have more than one material category, such as a frame assembly. Galvanization aa767 be used to prepare reinforcing bars.
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.
LME grade, special high grade, high grade, intermediate grade, and prime western grade.
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.
The requirements in the specification facilitate the production of a high-quality zinc coating and are similar to those found in A and A All fabricated assemblies shall be designed with vent and drain holes such that no air is trapped during immersion of the assemblies into cleaning ast or molten zinc.
Leave this field blank.