specification 822 steel reinforcement

7/30/2019 Specification 822 Steel Reinforcement

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MAIN ROADS Western Australia Specification 822 Steel Reinforcement Page 1 of 14Contract xxx/xx Document 04/10136 Issue 24/10/12

SPECIFICATION 822

STEEL REINFORCEMENT

Copyright MAIN ROADS Western Australia


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SPECIFICATION 822

STEEL REINFORCEMENT

REVISION REGISTER

Date ClauseNumber

Descrip tion of Revision AuthorisedBy

24 Oct 12 822.06 Inclusion of ACRSCertification

A/SDSE

11 J une 10 Wholedocument

Complete review nochange

A/SDSE

1 Aug 06 Wholedocument

Complete revision of Issue1.3 to new format

MCP


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CONTENTS

Clause Page No

GENERAL ........................................................................................................................ 4822.01 SCOPE ......................................................................................................... 4822.02 REFERENCES ............................................................................................. 4822.03 CLEAR COVER REQUIREMENT ................................................................ 4822.04 822.05 NOT USED...................................................................................... 4

PRODUCTS AND MATERIALS ...................................................................................... 4822.06 STANDARDS ................................................................................................ 4822.07 BENDING AND CUTTING ............................................................................ 5822.08 STORAGE .................................................................................................... 6822.09 CLEANING ................................................................................................... 6822.10 MECHANICAL SPLICES .............................................................................. 6822.11 822.25 NOT USED...................................................................................... 6

OPERATIONS .................................................................................................................. 6822.26 FIXING .......................................................................................................... 6822.27 WELDING ..................................................................................................... 7822.28 LAP SPLICES ............................................................................................... 7822.29 TOLERANCES FOR FIXING ........................................................................ 7822.30 822.70 NOT USED.................................................................................... 11

AS BUILT AND HANDOVER REQUIREMENTS ........................................................... 11822.71 822.90 NOT USED.................................................................................... 11

CONTRACT SPECIFIC REQUIREMENTS .................................................................... 11822.91 822.99 NOT USED.................................................................................... 11


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SPECIFICATION 822

STEEL REINFORCEMENT

GENERAL

822.01 SCOPE

1. The work under this specification consists of the scheduling,supply, delivery and fixing of steel reinforcement to be cast intoconcrete.

822.02 REFERENCES

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

Austral ian/New Zealand Standards

AS/NZS 1554.3 Structural Steel Welding Welding of ReinforcingSteel

AS/NZS 4671 Steel Reinforcing Materials

822.03 CLEAR COVER REQUIREMENT

1. The minimum cover measured from the surface of theconcrete to the face of any reinforcing steel shall be as shown on theDrawings.

822.04 822.05 NOT USED

PRODUCTS AND MATERIALS

822.06 STANDARDS

1. Reinforcement used in the Works shall comply with theAustralian Standards listed in Table 822.1.

2. Manufacturers and processors of steel reinforcing materialsmust hold a valid certificate of approval issued by theAustralian Certification Authority for Reinforcing Steels Ltd

(ACRS).


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TABLE 822.1 REINFORCEMENT USED IN WORKS

Reinforcement Specification

Grade 500N Hot Rolled Deformed SteelReinforcing Bars for Concrete

AS/NZS 4671

Reinforcing Wire AS/NZS 4671

Reinforcing Fabric/Welded Mesh Grade 500L AS/NZS 4671

822.07 BENDING AND CUTTING

1. The Contractor shall prepare reinforcement bendingschedules from the Drawings.

Schedule

2. Reinforcement shall be accurately cut and bent to thedimensions and shapes shown on the Drawings. All bars shall be bentin accordance with Table 822.2 unless otherwise detailed on theDrawings. Pin diameters for bends shall be in accordance with Table822.3 and hook and cog allowances in accordance with Table 822.4.

3. Reinforcement partially embedded in concrete shall not befield bent unless it is allowed for on the Drawings. Where field bendingis required it shall be carried out by the application of a constant forceusing a pin diameter as specified in Table 822.3.

4. Heating of reinforcement shall not be permitted except whereindicated on the Drawings and shall then only be carried out inaccordance with the following requirements:

a) The steel shall be heated uniformly for at least 100 mmeach side of the portion to be bent.

b) For grade 500 steel the heating shall be controlled suchthat the temperature does not exceed 450C and shallbe measured with temperature indicating crayons. Steelheated beyond 450C shall be rejected.

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

d) Heated bars shall not be cooled rapidly by quenching orany other means.

e) All heating shall be carried out in the presence of theSuperintendent.

5. Prior to heating any reinforcement the Contractor shallsupply to the Superintendent ful l details of the proposed heatingprocedure.

HOLD

POINT


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822.08 STORAGE

1. Reinforcing steel shall be stored above ground level andshall be protected from damage and deterioration.

822.09 CLEANING

1. Reinforcement placed in the Works shall be clean and freefrom all loose rust and mill-scale and all dirt and grease and all otherforeign substances. After being placed in position all reinforcement shallbe maintained in a clean condition until it is embedded in the concrete.

822.10 MECHANICAL SPLICES

1. Mechanical splices shall be used only where shown on theDrawings. Alternative mechanical splices to the ones shown on theDrawings may be used provided that they are capable of developing atleast 125% of the specified yield strength of the bar and meet thedimensional and clearance requirements shown on the Drawings.

822.11 822.25 NOT USED

OPERATIONS

822.26 FIXING

1. Reinforcing steel shall be accurately placed in the positionsshown on the Drawings in accordance with the tolerances given in Table822.5.

2. The reinforcement shall be secured in position so that it shallnot be displaced during the placement of concrete and the Contractorshall ensure that there is no disturbance of the reinforcement in concretethat has already been placed.

3. Reinforcing bars intended to be in contact at points wherethey cross shall be bound together with 1.6mm annealed soft iron tiewire. Stirrups shall be wired securely to the bars they are intended torestrain so as to form an effective reinforcement cage.

4. All reinforcing steel supported off formwork where theresulting concrete surface will be exposed, shall be supported on specialpurpose bar spacers approved by the Superintendent.

5. Reinforcement not supported off formwork or where theresulting concrete surface will be concealed may alternatively besupported on concrete blocks or plastic chairs approved by theSuperintendent.


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822.27 WELDING

1. Welding or tack welding of reinforcement shall not bepermitted except where indicated on the Drawings and shall then complywith the following requirements:

a) Welding shall be in accordance with AS/NZS 1554.3.

b) Welding of grade 500 steel will not be permitted within75mm of a bend.

c) Welds shall not be broken out.

2. Prior to welding any reinforcement, the Contractor shallsupply to the Superintendent documentation showing that weldersto be employed on the Works are suitably qualified and that thequalification of welding procedures has been verified by testing in

accordance with the requirements of AS/NZS 1554.3

HOLD

POINT

822.28 LAP SPLICES

1. Reinforcement shall only be spliced at locations shown onthe Drawings.

2. The minimum length of lap shall be as indicated on theDrawings.

3. Welded steel wire fabric shall be lapped as detailed on the

Drawings and where not detailed shall overlap by at least one completemesh on all sides such that the end cross wire of one sheet overlapswith the second end wire of the adjacent sheet. Loose bars shall not beused in conjunction with fabric reinforcement except where shown on theDrawings. Loose small pieces of fabric shall only be used where theyare essential for fitting into small confined parts of the Works.

822.29 TOLERANCES FOR FIXING

1. The tolerances for fixing of reinforcement are given in Table822.5.


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1 2 3 4

Nominal length Nominal size Tolerance

Condition or Dimension or Diameter of (mm)L (mm) Bar (mm)

On each overall dimension, or on the overall dimensionof each straight portion, or on that offset dimension,controlled by concrete cover at both ends for barsother than fitments. Up to 600 Up to 20 +0 -20

Up to 600 Over 20 +0 -30

Over 600 Up to 20 +0 -40

Over 600 Over 20 +0 -50

Up to 600 Up to 20 -0 +20

Up to 600 Over 20 -0 +30

Over 600 Up to 20 -0 +40

Over 600 Over 20 -0 +50

On that overall dimension controlled by cover atboth ends, for fitments (ties, stirrups, helices,hoops, and the like) only.

Up to 600 Up to 12 +0 -10

Up to 600 16 to 20 +0 -15

Over 600 Up to 20 +0 -20

Any Length Over 20 +0 -30

Up to 600 Up to 12 - 0 +10

Up to 600 16 to 20 -0 +15

Over 600 Up to 20 -0 +20

Any Length Over 20 -0 +30

On the overall dimension, or on the overall dimensionof each straight portion, or on that offset dimension,controlled by concrete cover at one end only or atneither end.

Any length Any size -0 +50

including

allowances

for laps.

On the overall offset dimension of a cranked column bar Any offset Up to 20 -0 +10

On the deviation from square measured in relation to Any bar 24 and overthe end 300mm of the sawn or machined end of a length.

a straight bar intended for use as an end bearing

TABLE 822.2 FABRICATION


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Case Material Diameter

a) Reinforcement, other than that specifiedin items (b), (c) or (d) below.

All deformed bars

Fabric

5 db3 db

b) Fitments Wire and fabric

Grade 230R bars

All deformed bars

3 db3 db4 db

c) Reinforcement in which the bend isintended to be subsequentlystraightened or re-bent

Size 16 mm or less

Size 20 mm or 24mm

Size 28 mm orgreater

4 db5 db6 db

d) Reinforcement which is epoxy-coated or

galvanised, either before or afterbending

Size 16 mm or less

Size 20 mm orgreater

5 db8 db

NOTE: db is the diameter of the bar being bent.

TABLE 822.3 PIN DIAMETERS FOR BENDS

Bar Diam (mm) 6 10 12 16 20 24 28 32 36

Length Allowance (mm)(assumed pin diameter, 5db)

120 140 160 180 220 260 300 340 380

TABLE 822.4 HOOK AND COG ALLOWANCES FOR BENT BARS AND FITMENTS


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1 2 3

Case Condition Tolerance(mm)

1 Where concrete cover to the 1a. At the end ofreinforcement is the controlling reinforcement.factor. Tolerances on Dimensions 'C'

-0 +30

1b. At the outside edge of Tolerances on Dimension 'T'reinforcement or fitment. -0 +20 when compression face

-0 +10 when tension face

Tolerances on Dimension 'B'-0 +10 when tension face-0 +20 when compression face

2 Where cover is not 2a. At the end of reinforcement. Tolerance on Dimension 'L'.controlling. 50

(see Case 1)

2b. At the outside edge of Tolerances on Dimension 'E'reinforcement including 10fitments.

3 Lateral spacing of 3a. Beam or column type member.reinforcement.

Tolerance on Dimension 'S'

+0.1S or 15mm

whichever is greater.

3b. Slab or wall type member.

4 Bars in corners, crossing bars Bars to be placed in configurationstarter bars, etc. shown on the Drawings.

Tolerances on location of anindividual bar 15mm unlessotherwise limited by coverrequirements of case 1 above.

The tolerances given above are the maximum permissable, but it should be noted thatin some circumstances, where reinforcement is fabricated to maximum tolerance,they may not be fully available.

NOTE: This table should be read in conjuction with Table 822.2

TABLE 822.5 TOLERANCES ON FIXING REINFORCEMENT


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822.30 822.70 NOT USED

AS BUILT AND HANDOVER REQUIREMENTS

822.71 822.90 NOT USED

CONTRACT SPECIFIC REQUIREMENTS

822.91 822.99 NOT USED


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SPECIFICATION 822 GUIDANCE NOTES

DELETE THESE GUIDANCE NOTES FROM FINAL DOCUMENT AFTER USING FORREFERENCE

All edits to downloaded TDP documents shall be tracked (most word processingsoftware allows this to be done automatically). Deletions shall be struck through e.g.example. Insertions shall be in italics e.g. example. Ifall information relating to a clauseis deleted then the clause number should be retained and the words "NOT USED"should be inserted.

The proposed documents with tracked changes shall be submitted to the ProjectManager for review, prior to printing the final batch of documents. When this finalprinting is carried out, the tracked changes option is to be turned off.

The Custodian of this specification is the Structures Design and Standards Engineer.

NO GUIDANCE NOTES OR CONTRACT SPECIFIC REQUIREMENTS AVAILABLE ATTHIS TIME.


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CONTRACT SPECIFIC REQUIREMENTS TO ADD OR DELETE

The following clauses are to be placed under the CONTRACT SPECIFICREQUIREMENTS as required.


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SPECIFICATION AMENDMENT CHECKLIST

Specification Name: No: 822 Revision No: _______Title: STEELREINFORCEMENT

Project Manager: Name: _______________Signature: ____________Date:______

Checked By: Name: _______________Signature: _______________Date:______

Contract No: ___________Contract Description: _______________________________

ITEM DESCRIPTION SIGNOFF

Note: All changes/amendments must be shown in Tracked Change mode untilapproved.

1. Project Manager has reviewed Specification and identifiedAdditions and Amendments.

2. CONTRACT SPECIFIC REQUIREMENTS addressed? Contract specific materials/products/clauses added? (ReferSpecification Guidance Notes for guidance).

3. Any unlisted Materials/Products proposed and approved by theProject Manager? if Yes provide details at 15.

4. Standard Clauses amended? MUST SEEK approval fromMCP.

5. Clause deletions shown as NOT USED.6. Appropriate INSPECTION & TESTING parameters included in

Spec 201 (Test Methods, Minimum Testing Frequenciesverified).

7. ANNEXURES completed (Refer Specification Guidance Notes).8. HANDOVER andAS BUILT requirements addressed.9. Main Roads QS has approved changes to SMM.10. Project Manager certifies completed Specification reflects intent

of the design.11. Completed Specification independent verification arranged by

Project Manager12. Project Managers review completed.13. SPECIFICATION GUIDANCE NOTES deleted.14. TABLE OF CONTENTS updated.15 Supporting information prepared and submitted to Project

Manager.Further action necessary:

Signed: (Project Manager) Date: _______________

specification 822 steel reinforcement

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