ASTM A Standard Specification for Zinc-Coated Parallel and Helical Steel Wire Structural Strand. Normativa ASTM A – Download as PDF File .pdf), Text File .txt) or read online. ASTM Aa() Standard Specification for Zinc-Coated Parallel and Helical Steel Wire Structural Strand Scope.
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ASTM B r A number in parentheses indicates the year of last reapproval.
A superscript epsilon e indicates an editorial change since the last revision or reapproval. It can be furnished with Class B weight or Class C weight zinc-coated outer wires where additional corrosion protection is required.
NOTE 1—A typical ordering description is as follows: Class B Coating Outer Wires Class C Coating Outer Wires Current edition approved April 10, Originally published as A — ast, Last previous edition A — In this case the prestretching provision of the test sample of 5. The hand straightening ashm to permit insertion of the specimen in the jaws of the testing machine shall be performed by drawing between wood blocks or by some other equally satisfactory means.
Apply a load corresponding to the tensile stress indicated in Table 5, using the nominal diameter of the specimen. Maintain this load while a in. Then increase the load uniformly until the extensometer indicates an extension of 0. Record the load for this extension. The stress corresponding to this load shall meet the requirements for the stress of 0.
Hold the specimen at 0. Continue the application of load until fracture occurs. Record the elongation attained from the elongation extensometer and add to it 0.
Apply a load, corresponding to the tensile stress indicated in Table 5, using the nominal diameter of aetm specimen. Maintain this load and attach the extensometer. Then increase the load uniformly until the extension recorded by the extensometer is at least 0. Determine the load at 0.
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The stress corresponding to this load shall meet the requirements for stress at 0. It only implies that the wire sizes chosen by the strand manufacturer must meet asstm requirements of this specication.
NOTE 2—The extensometer used for the stress at 0. Two separate instruments are advisable since the more sensitive stress at 0. The elongation extensometer may be constructed with less sensitive parts or be constructed in a86 a way that little damage would result if fracture occurs while the extensometer is attached to the specimen. If fracture takes place outside the middle third of the gage length, the elongation value obtained may not be representative of the material.
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Loosening or detachment during the adherence test of supercial small particles of zinc formed by mechanical polishing of the surface of zinc-coated wire shall not be considered cause for rejection. If both of these tests pass, the coil or reel shall be accepted. The coating shall be continuous and reasonably uniform.
Test for Coating Weight 6. The number of layers and number and size of wires in each layer shall be determined by the manufacturer.
Structural Wire Products
Specically dimensioned strand bigger than 4 in. The properties of parallel wire strand shall be as agreed upon between the purchaser and the manufacturer. The modulus of elasticity shall be determined from gage length of not less than in. Joints and Splices 8. Welds made in the outer wires prior to drawing are permitted. Splicing of the inner wires during the stranding operation is permissible. Joints in the wires of strand shall be dispersed sufficiently so as to maintain the minimum breaking strength as listed in Table 1 and Table 2.
Sampling and Testing 9.
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If it fails to meet the minimum breaking strength requirement, and has not broken in the cone or grips, two additional satm shall be cut from the same manufactured length and tested. If either additional sample fails the retest for breaking strength, the manufactured length in question shall be rejected.
If both of these two samples pass the retest adtm breaking strength, the manufactured length in question shall be accepted. Any test, however, which fails due to faulty attaching of the sockets shall be disregarded. The manufacturer shall afford the inspector representing the purchaser all reasonable facilities to satisfy him that the material is being furnished in accordance with this specication.
When specied, inspection may a856 waived, and certied copies of test reports furnished. Strand shall be packaged in such a manner so that no permanent deformation of wires in satm strand will occur.
The American Society for Testing and Materials takes no position respecting the a86 of any patent rights asserted in connection with any item mentioned in this standard. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the risk of infringement of such rights, are entirely their own responsibility.
This standard is subject to revision at any time by the responsible technical committee and must be reviewed every ve years and if not revised, either reapproved or withdrawn.
Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM Headquarters.
Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend.