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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First, the specification details the coating thickness requirements based on bar size. Within the text, the SI units are shown in brackets. This cold working of the bars causes induced stresses that may be released after the bars are immersed in the molten F aztm bath.
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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 material provided herein has been developed to provide accurate and authoritative information about after-fabrication hot-dip zstm steel. Requirements concerning the renovation of uncoated areas after initial hot-dip galvanizing are contained within the material specifications A, A, A It is the responsibility of the designer atm fabricator to ensure the product has been properly z767 and built before the hot-dip galvanizing process supporting specifications.
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.
The requirements for finish, appearance, and adherence are identical to those in the other main standards. Rebar is commonly bent prior to galvanizing, and the recommendations for diameter and best practices are provided in A The specification also calls out specific recommended before galvanizing bending radii. This specification covers rolled steel structural shapes for use in building framing or bridges, a776 for general structural purposes.
asym The galvanizer is identified throughout this specification as the manufacturer. All fabricated assemblies shall be designed with vent and drain holes such that no air is trapped during immersion of the assemblies into cleaning solutions or molten zinc.
Types of embrittlement commonly encountered with galvanized steel are related to aging phenomena, cold working, and absorption of hydrogen.
The values stated in each system may not be exact equivalents.
This specification covers zinc metal made from ore or other material by a process of distillation or by electrolysis in five grades as follows: 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.
There are coating thickness minimums, but no maximums, and the threads are not subject to the coating thickness requirement. Whenever different analyses of steel or different surfaces of steel are united in an assembly the galvanized finish is not generally uniform in appearance. 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.
The mass of the coating shall be determined by magnetic thickness gage measurements.
ASTM Specifications | American Galvanizer’s Association
Specification for Structural Steel. Number 12 and smaller bar must have a minimum of 3. The LCC analysis considers not only the initial cost of the system but also the future costs maintenance, replacement, etc.
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 coating which has high future costs. The galvanized coating shall be chromate treated.
ASTM A767 – Galvanizing Steel Bars for Concrete Reinforcement – Rebar
ASTM does not give a7667 warranty express or implied or make any representation that the contents of this abstract are accurate, complete or up to date. Q767 Specification for Zinc. Inspector Listing – Non-U. Combining values from the two systems may result in non-conformance with this specification. 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. Purchase a copy from the AGA, or contact your local galvanizer.
This post-treatment helps to prevent the formation of wet storage awtm 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. 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 atm.
The specification outlines three acceptable forms of touch-up: 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. This abstract is a brief summary of the referenced standard.