AS 1311-1987

1 - AS 1311-1987 STEEL TENDONS FOR PRESTRESSED CONCRETE - 7-WIRE STRESS-RELIEVED STEEL STRAND FOR TENDONS IN PRESTRESSED CONCRETE
4 - PREFACE
4 - CONTENTS
5 - 1 SCOPE.
5 - 2 REFERENCED DOCUMENTS.
5 - 3 DEFINITIONS.
5 - 3.1 Calculated mass per metre
5 - 3.2 Coil
5 - 3.3 Lay-length
5 - 3.4 Lot
5 - 3.5 Nominal area of strand
5 - 3.6 Relaxation
5 - 3.7 Strand
5 - 4 BASE MATERIAL.
5 - 4.1 Wire manufacture.
5 - 4.2 Chemical composition.
5 - 5 STRAND MANUFACTURE.
5 - 5.1 General.
5 - 5.2 Regular, super and extra-high tensile strands.
5 - 5.3 Compact strand.
5 - 6 JOINTS.
6 - 7 QUALITY OF FINISHED STRAND.
6 - 8 DIMENSIONS, MASS AND TOLERANCES.
6 - 8.1 Dimensions and mass.
6 - 8.2 Tolerance on strand diameter.
6 - 9 COIL FORMATION AND SIZES.
6 - 10 ASSESSMENTOF COMPLIANCE.
7 - 11 TESTING.
7 - 11.1 Tensile tests.
8 - 11.2 Relaxation test.
8 - 12 RETESTS.
8 - 13 ROUNDING OF NUMBERS.
8 - 14 TEST CERTIFICATE.
8 - 15 MARKING.
8 - 16 PACKING.
9 - APPENDIX A - PURCHASING GUIDELINES
9 - A1 GENERAL.
9 - A2 INFORMATION TO BE SUPPLIED BY PURCHASER.
9 - A3 FACILITIES FOR TESTING.
9 - A4 INSPECTION.
10 - APPENDIX B - RELAXATION TEST
10 - B1 SCOPE.
10 - B2 PRINCIPLE.
10 - B3 TEST RIG.
10 - B4 TEST CONDITIONS.
10 - B5 PROCEDURE.
10 - B6 CALCULATION.
10 - B7 REPORT.

Specifies requirements for four grades of 7-wire, stress-relieved, high-tensile steel strand, intended for the prestressing of concrete.

This Standard specifies requirements for four grades of 7-wire stress-relieved, high-tensile steel strand, intended for the prestressing of concrete. The four grades of the 7-wire strand are as follows:(a) Regular, in either normal or low relaxation.(b) Super, in either normal or low relaxation.(c) Extra-high tensile, in either normal or low relaxation.(d) Compact, in low relaxation only.This Standard provides for Regular, Super and Extra-high Tensile grades to be constructed with either plain or indented outer wires.NOTE: Guidelines to purchasers on requirements that should be specified by the purchaser and those that should be agreed at the time of enquiry or order are given in Appendix A.