SPECIFICATION 822

STEEL REINFORCEMENT

Copyright MAIN ROADS Western Australia

Specification 822 Steel Reinforcement – 04/10136 Issued 02/05/2017
REVISION REGISTER
Clause
Number / Description of Revision / Authorised By / Issue Date
Whole document / Reformatted / SCO / 02/05/2017
Whole document / Reformatted to corporate branding guidelines / MPS / 02/02/2016
822.02 and 822.06 / Standard for bar chairs added / SDSE / 02/02/2016
822.07 / Clause 2 changed and Tables 822.3 and 822.4 deleted
822.30 / Previous Section 822.29 is now Section 822.30. Previous Table 822.5 renumbered Table 822.3.
822.29 / New section for bar chairs and spacers added
822.06 / Inclusion of ACRS Certification / A/SDSE / 24/10/2012
Whole document / Complete review – no change / A/SDSE / 11/06/2010
Whole document / Complete revision of Issue 1.3 to new format / MCP / 01/08/2006

CONTENTS

ClausePage No

GENERAL

822.01Scope

822.02References

822.03Clear Cover Requirement

822.04 – 822.05NOT USED

Products and Materials

822.06Standards

822.07Bending and Cutting

822.08Storage

822.09Cleaning

822.10Mechanical Splices

822.11 – 822.25NOT USED

OPERATIONS

822.26Fixing

822.27Welding

822.28Lap Splices

822.29Bar Chairs and Spacers

822.30Tolerances for Fixing

822.30 – 822.70NOT USED

AS BUILT AND HANDOVER REQUIREMENTS

822.71 – 822.90NOT USED

CONTRACT SPECIFIC REQUIREMENTS

822.91 – 822.99NOT USED

SPECIFICATION 822

STEEL REINFORCEMENT

GENERAL
822.01SCOPE
  1. The work under this specification consists of the scheduling, supply, delivery and fixing of steel reinforcement to be cast into concrete.

822.02REFERENCES
  1. Australian Standards, MAIN ROADS Western Australia Standards and MAIN ROADS Western Australia Test Methods are referred to in abbreviated form (e.g. AS 1234, MRS 67-08-43 or WA123). For convenience, the full titles are given below:

Australian/New Zealand Standards
AS/NZS 1554.3Structural Steel Welding – Welding of Reinforcing Steel
AS/NZS 4671Steel Reinforcing Materials
AS/NZS 2425Bar Chairs in Reinforced Concrete – Product Requirements and Test Methods
822.03CLEAR COVER REQUIREMENT
  1. The minimum cover measured from the surface of the concrete to the face of any reinforcing steel shall be as shown on the Drawings.

822.04 – 822.05NOT USED
Products and Materials
822.06STANDARDS
  1. Reinforcement used in the Works shall comply with the Australian Standards listed in Table 822.1.

TABLE 822.1 – REINFORCEMENT USED IN WORKS
Reinforcement / Specification
Grade 500N Hot Rolled Deformed Steel Reinforcing Bars for Concrete / AS/NZS 4671
Reinforcing Wire / AS/NZS 4671
Reinforcing Fabric/Welded Mesh Grade 500L / AS/NZS 4671
  1. Bar chairs and spacers used in the Works shall comply with AS/NZS2425.

  1. Manufacturers and processors of steel reinforcing materials must hold a valid certificate of approval issued by the Australian Certification Authority for Reinforcing Steels Ltd (ACRS).

822.07BENDING AND CUTTING
  1. The Contractor shall prepare reinforcement bending schedules from the Drawings.
/ Schedule
  1. Reinforcement shall be accurately cut and bent to the dimensions and shapes shown on the Drawings. All bars shall be bent in accordance with AS5100.5 unless otherwise detailed on the Drawings. Pin diameters for bends and hook and cog allowances shall be in accordance with AS5100.5.

  1. Reinforcement partially embedded in concrete shall not be field bent unless it is allowed for on the Drawings. Where field bending is required it shall be carried out by the application of a constant force using a pin diameter as specified in AS 5100.5.

  1. Heating of reinforcement shall not be permitted except where indicated on the Drawings and shall then only be carried out in accordance with the following requirements:

  1. The steel shall be heated uniformly for at least 100 mm each side of the portion to be bent.

  1. For grade 500 steel the heating shall be controlled such that the temperature does not exceed 450°C and shall be measured with temperature indicating crayons. Steel heated beyond 450°C shall be rejected.

  1. Grade 250N steel may be heated to a dull cherry red.

  1. Heated bars shall not be cooled rapidly by quenching or any other means.

  1. All heating shall be carried out in the presence of the Superintendent.

  1. Prior to heating any reinforcement the Contractor shall supply to the Superintendent full details of the proposed heating procedure.
/ HOLD POINT
822.08STORAGE
  1. Reinforcing steel shall be stored above ground level and shall be protected from damage and deterioration.

822.09CLEANING
  1. Reinforcement placed in the Works shall be clean and free from all loose rust and mill-scale and all dirt and grease and all other foreign substances. After being placed in position all reinforcement shall be maintained in a clean condition until it is embedded in the concrete.

822.10MECHANICAL SPLICES
  1. Mechanical splices shall be used only where shown on the Drawings. Alternative mechanical splices to the ones shown on the Drawings may be used provided that they are capable of developing at least 125% of the specified yield strength of the bar and meet the dimensional and clearance requirements shown on the Drawings.

822.11 – 822.25NOT USED
OPERATIONS
822.26FIXING
  1. Reinforcing steel shall be accurately placed in the positions shown on the Drawings in accordance with the tolerances given in Table 822.5.

  1. The reinforcement shall be secured in position so that it shall not be displaced during the placement of concrete and the Contractor shall ensure that there is no disturbance of the reinforcement in concrete that has already been placed.

  1. Reinforcing bars intended to be in contact at points where they cross shall be bound together with 1.6mm annealed soft iron tie wire. Stirrups shall be wired securely to the bars they are intended to restrain so as to form an effective reinforcement cage.

  1. All reinforcing steel supported off formwork where the resulting concrete surface will be exposed, shall be supported on special purpose bar chairs or spacers, as appropriate, approved by the Superintendent.

  1. Reinforcement not supported off formwork or where the resulting concrete surface will be concealed may alternatively be supported on concrete blocks or plastic chairs approved by the Superintendent.

822.27WELDING
  1. Welding or tack welding of reinforcement shall not be permitted except where indicated on the Drawings and shall then comply with the following requirements:

  1. Welding shall be in accordance with AS/NZS 1554.3.

  1. Welding of grade 500 steel will not be permitted within 75mm of a bend.

  1. Welds shall not be broken out.

  1. Prior to welding any reinforcement, the Contractor shall supply to the Superintendent documentation showing that welders to be employed on the Works are suitably qualified and that the qualification of welding procedures has been verified by testing in accordance with the requirements of AS/NZS 1554.3.
/ HOLD POINT
822.28LAP SPLICES
  1. Reinforcement shall only be spliced at locations shown on the Drawings.

  1. The minimum length of lap shall be as indicated on the Drawings.

  1. Welded steel wire fabric shall be lapped as detailed on the Drawings and where not detailed shall overlap by at least one complete mesh on all sides such that the end cross wire of one sheet overlaps with the second end wire of the adjacent sheet. Loose bars shall not be used in conjunction with fabric reinforcement except where shown on the Drawings. Loose small pieces of fabric shall only be used where they are essential for fitting into small confined parts of the Works.

822.29BAR CHAIRS AND SPACERS
  1. Steel reinforcement shall be secured in position by bar chairs and spacers manufactured under factory-controlled conditions from extruded fibre concrete or conventional concrete. Fibres are to be synthetic and non-metallic.

  1. Bar chairs and spacers shall have durability and strength greater than those specified for the surrounding concrete. Concrete bar chair shall have a minimum concrete compression strength of 60MPa and a RCPT (Rapid Chloride Penetration Test) value not exceeding 1000coulombs.

  1. Bar chairs and spacers made from metal, plastic-coated metal or site-cast concrete shall not be used.

  1. Test requirements and sampling frequency for bar chairs shall be in accordance with AS/NZS 2425.

  1. The Contractor shall submit for approval by the Superintendent not less than 14 days prior to the proposed use of steel reinforcement supports and spacers a signed document including relevant tests reports demonstrating that the performance of the supports and spacers satisfied the requirements of AS/NZS 2425 and this specification.
/ HOLD POINT
822.30TOLERANCES FOR FIXING
  1. The tolerances for fixing of reinforcement are given in Table822.2.

TABLE 822.2FABRICATION

TABLE 822.3 – TOLERANCES ON FIXING REINFORCEMENT

822.30 – 822.70NOT USED
AS BUILT AND HANDOVER REQUIREMENTS
822.71 – 822.90NOT USED
CONTRACT SPECIFIC REQUIREMENTS
822.91 – 822.99NOT USED

GUIDANCE NOTES

FOR REFERENCE ONLY – DELETE GUIDANCE NOTES FROM FINAL DOCUMENT

  1. All edits to downloaded Specifications shall be made using Track Changes, to clearly show added/deleted text.
  1. If all information relating to a clause is deleted, the clause number should be retained and the words “NOT USED” should be inserted.
  2. The proposed documents with tracked changes shall be submitted to the Project Manager for review, prior to printing the final batch of documents. When this final printing is carried out, the tracked changes option is to be turned off.
  3. Before printing accept all changes in the document, turn off Track Changes and refresh the Table of Contents.
  4. The Custodian of this specification is the Structures Design and Standards Engineer.

NO GUIDANCE NOTES OR CONTRACT SPECIFIC REQUIREMENTS AVAILABLE AT THIS TIME.

CONTRACT SPECIFIC REQUIREMENTS

The following clauses are to be placed under the CONTRACT SPECIFIC REQUIREMENTS, as required. After inserting the clause, change the clause number and heading to style “H2 SP” so it appears in the Table of Contents.

XXX.XXSUB HEADING (H2 SP)
  1. Insert text (Main Table SP)
/ Keyword SP
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XXX.XXSUB HEADING (H2 SP)
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AMENDMENT CHECKLIST

Specification No. / 822 / Title: / STEEL REINFORCEMENT / Revision No:
Project Manager: / Signature: / Date:
Checked by: / Signature: / Date:
Contract No: / Contract Description:
ITEM / DESCRIPTION / SIGN OFF
Note: All changes/amendments must be shown in Tracked Changes mode until approved.
Project Manager has reviewed Specification and identified Additions and Amendments.
CONTRACT SPECIFIC REQUIREMENTS addressed? Contract specific materials, products, clauses added? (Refer Specification Guidance Notes for guidance).
Any unlisted materials/products proposed and approved by the Project Manager? If “Yes” provide details at 16.
Standard clauses amended? MUST SEEK approval from Manager Commercial.
Clause deletes shows as “NOT USED”.
Appropriate INSPECTION AND TESTING parameters included in Spec 201 (Text Methods, Minimum Testing Frequencies verified).
ANNEXURES completed (refer Specification Guidance Notes).
HANDOVER and AS BUILT requirements addressed.
Main Roads QS has approved changes to SMM.
Project Manager certifies completed Specification reflects intent of the design.
Completed Specification – independent verification arranged by Project Manager.
Project Manager’s review completed.
SPECIFICATION GUIDANCE NOTES deleted.
TABLE OF CONTENTS updated.
FOOTER updated with Document No., Contract No. and Contract Name.
Supporting information prepared and submitted to Project Manager.
Further action necessary:
Signed: / (Project Manager) / Date:

Document No: DXX#XXXXPage 1 of 13

Contract No: XXX/XX [Contract Name]