Abstract

This test method deals with the standard procedures for establishing the relative bond strength of Grade 270 prestressing steel strands of specified diameter in cement grout as used in prestressed ground anchors for evaluating the effects of manufacturing practices on bond strength. The bond strength values obtained shall not be used to design the bond strength of ground anchors that depend on field conditions. This test method is not intended to be used as a bond test for pretensioned concrete applications. The test specimen shall be cut from standard production coils and shall not be wiped or cleaned. Pull test shall be made in accordance with the method.

This abstract is a brief summary of the referenced standard. It is informational only and not an official part of the standard; the full text of the standard itself must be referred to for its use and application. ASTM does not give any warranty express or implied or make any representation that the contents of this abstract are accurate, complete or up to date.

1. Scope

1.1 This test method describes procedures to establish the relative bond strength of 0.600-in. [15.24-mm] diameter, Grade 270 [1860] steel prestressing strand in cement grout as used in prestressed ground anchors for the purpose of evaluating the effects of manufacturing practices on bond strength.

1.2 The bond strength values obtained are not intended to be used to design the bond length of ground anchors that depend on field conditions.

1.3 This test method is not intended to be used as a bond test for prestressed concrete applications.

1.4 The values stated in either inch-pound or SI units are to be regarded as standard. Within the text, the 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 standard.

1.5 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.

ASTM Standards

A416/A416M Specification for Steel Strand, Uncoated Seven-Wire for Prestressed Concrete

C150 Specification for Portland Cement

C511 Specification for Mixing Rooms, Moist Cabinets, Moist Rooms, and Water Storage Tanks Used in the Testing of Hydraulic Cements and Concretes

C1019 Test Method for Sampling and Testing Grout

E4 Practices for Force Verification of Testing Machines

Keywords

bond strength test; prestressed ground anchors; steel prestressing strand: Anchors/anchorage systems; Bond strength--metals/alloys; Ground anchors; Prestressing steel; Steel wire strand; Uncoated steel;

ICS Code

ICS Number Code 91.080.10 (Metal structures)

DOI: 10.1520/A0981_A0981M-11

ASTM International is a member of CrossRef.

ASTM A981 / A981M