ASTM-A1081 › Standard Test Method for Evaluating Bond of Seven-Wire Steel Prestressing Strand
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Scope
1.1 This test method describes procedures for determining the bond of seven-wire steel prestressing strand. The bond determined by this test method is stated as the tensile force required to pull the strand through the cured mortar in a cylindrical steel casing. The result of the test is the tensile force measured on the loaded-end of the strand corresponding to a movement of 0.1 in. (2.5 mm) at the free-end of the strand.
1.2 This test method is applicable either in inch-pound units (as Specification A1081) or SI units (as Specification A1081M).
1.3 The values stated in either inch-pound units or in SI units are to be regarded separately as standard. Within the text, SI units are shown in brackets. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the specification.
1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
Significance and Use
5.2 In pre-tensioned concrete applications, the prestressing steel strand is expected to transfer prestressing forces to the structural member via the adhesion (that is, bond) of the exposed wire strand surfaces to the surrounding cementitous material.
5.3 Manufacturing processes, subsequent handling, and storage conditions can influence the strand bond.
5.4 Prestressing steel strand is used in construction applications with a variety of concrete mixtures. Developing tests and threshold values for the performance of the strand in each of these unique mixtures is impractical.
Keywords
bond test; prestressing steel strand; seven-wire strand; ICS Number Code 77.140.65 (Steel wire, wir ropes and link chains)
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01.04 (Steel--Structural, Reinforcing, Pressure Vessel, Railway)
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Document Number
ASTM-A1081_A1081M-21
Revision Level
2021 EDITION
Status
Current
Modification Type
New
Publication Date
March 24, 2021
Document Type
Test Method
Page Count
5 pages
Committee Number
A01.05