ASTM-A416/A416M:17a pdf free download – Standard Specification for Low-Relaxation, Seven-Wire Steel Strand for Prestressed Concrete.
10. Number of Tests
10.1 One test specimen shall be taken from each 30-ton [27-tonnel production lot of finished strand and tested for breaking strength, yield strength, and elongation.
11. Inspection
11. 1 Inspection of the low—relaxation, seven—wire steel strand shall be agreed upon between the purchaser and the manufacturer as part of the purchase order or contract.
12. Rejection
12.1 Failure of any test specimen to comply with the requirements of the specification shall constitute grounds for rejection of the production lot represented by the specimen.
12.2 The production lot shall be resubmitted for inspection by testing a specimen from each reel or reelless pack and sorting out non-conforming material.
12.3 If there is a reasonable doubt in the initial testing as to the ability of the strand to meet any requirement of this specification, two additional tests shall be made on specimens of strand from the same reel or reelless pack, and if failure occurs in either of these tests, the strand shall be rejected.
13. Certification
13.1 At the time of shipment. the purchaser shall be furnished with a written certification that specimens representing each lot of strand have been either tested or inspected as required in this specification and the requirements have been satisfied. The certification shall include ASTM designation A416[A416M]. year of issue, and revision letter, if any.
13.2 When requested in the purchase order or contract, the manufacturer shall furnish a representative load-elongation curve for each size and grade of strand shipped.
13.3 When the modulus of elasticity of a seven-wire strand is provided, the cross-sectional area used to calculate that modulus also shall he provided. The area provided in the certification shall he the area used to calculate the modulus of elasticity.
13.4 A material test report, certificate of inspection, or similar document printed from or used in electronic form from an electronic data interchange (ED!) transmission shall be regarded as having the same validity as a counterpart printed in the certifier s facility. The content of the EDI transmitted document shall meet the requirements of the invoked ASTM standard(s) and conform to any existing EDI agreement between the purchaser and the manufacturer. Notwithstanding the absence of a signature, the organization submitting the ED! transmission is responsible for the content of the report.
Note 3—The industry definition as invoked here is: El)! is the compuler-lo-computer exchange of business information in a standard format such as ANSI ASC X12.
14. Packaging and Package Marking
14.1 The strand shall be furnished on reels or in reelless packs having a minimum core diameter of 24 in, [610 mm], unless otherwise specified by the purchaser.