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Significance and Use
5.1 Prestressing steel strand is used in pre-tensioned and post-tensioned concrete construction.
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.
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 ) or SI units (as Specification ).
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.
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
A416/A416M Specification for Low-Relaxation, Seven-Wire Steel Strand for Prestressed Concrete
C33/C33M Specification for Concrete Aggregates
C109/C109M Test Method for Compressive Strength of Hydraulic Cement Mortars (Using 2-in. or [50-mm] Cube Specimens)
C150/C150M Specification for Portland Cement
C192/C192M Practice for Making and Curing Concrete Test Specimens in the Laboratory
C670 Practice for Preparing Precision and Bias Statements for Test Methods for Construction Materials
C1437 Test Method for Flow of Hydraulic Cement Mortar
ICS Number Code 77.140.65 (Steel wire, wir ropes and link chains)
UNSPSC Code 31152208(Prestressed concrete stranded steel wire)
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ASTM A1081 / A1081M-15, Standard Test Method for Evaluating Bond of Seven-Wire Steel Prestressing Strand, ASTM International, West Conshohocken, PA, 2015, www.astm.orgBack to Top