Concrete reinforcement by mikesanye

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									Covered Outdoor Learning Area ( Large )
                                                                     0312 CONCRETE REINFORCEMENT



0312 CONCRETE REINFORCEMENT




1     GENERAL


1.1   CROSS REFERENCES
General
General: Conform to the General requirements worksection.

1.2   AIMS
Responsibilities

Provide reinforcement required as part of the Structural Concrete Design in conjunction with the INSITU
CONCRETE worksection and EARTHWORKS & SYNTHETIC TURF SURFACING of the specification for
the reinforced concrete pad footings and the concrete edge restraint for the turf to the perimeter of the court
playing area.
Associated worksections
Associated worksections: Conform to the following:
- CONCRETE IN SITU
- EARTHWORKS & SYNTHETIC TURF SURFACING for concrete edge restraint.

1.3   STANDARDS
General
Standard: To AS 3600.
Tolerances
Fabrication, including bending and cutting, and fixing: To AS 3600.

1.4   INSPECTION
Notice
Inspection: Give notice so that inspection may be made of the following:
- Cores and embedments fixed in place.
- Reinforcement fixed in place, with formwork completed.

1.5   SUBMISSIONS
Execution – proposals
Changes: If changes are proposed to reinforcement shown on the drawings, submit details.
Damaged galvanizing: If repair is required, submit proposals to AS/NZS 4680 Section 8.
Mechanical splices: If mechanical bar splices are proposed or required, submit details and test
certificates for each size and type of bar to be spliced.
Provision for concrete placement: If spacing or cover of reinforcement does not comply give notice.
Splicing: If splicing not documented is proposed, submit details.
Welding: Give notice before welding reinforcement.
Products – documentation
Type-tests: Submit type-test reports to verify conformance for each reinforcement type as follows:
- Strength and ductility: To AS 3600 Table 6.2.1.
Certification
Manufacturers and processors of steel reinforcement must hold a current certificate of approval issued
by the Australian Certification Authority for Reinforcing Steel (ACRS). Evidence of compliance with this
clause must be submitted prior to commencement on site.

                                              Page 1 of 3                                       May 2009
Covered Outdoor Learning Area ( Large )
                                                                  0312 CONCRETE REINFORCEMENT



2     PRODUCTS


2.1   MATERIALS


Protective coating
General: For concrete elements containing protective coated reinforcement, provide the same coating
type to all that element’s reinforcement and embedded ferrous metal items, including tie wires, stools,
spacers, stirrups, plates and ferrules, and protect other embedded metals with a suitable coating.
Epoxy coating: To be high build, high solids chemically resistant coating.
- Thickness: 200 µm minimum.
Galvanizing: To AS/NZS 4680:
- Sequence: If fabrication is to occur after galvanizing, submit proposals for galvanizing repair and
   coating of cut ends.
                                     2
- Zinc-coating (minimum): 600 g/m .
Steel reinforcement
Standard: To AS/NZS 4671.
- Ductility grade: Class N.
Surface condition: Free of loose mill scale, rust, oil, grease, mud or other material which would reduce
the bond between the reinforcement and concrete.
Tie wire
General: To be annealed steel 1.25 mm diameter (minimum).
External and corrosive applications: Galvanized.

3     EXECUTION


3.1   CONSTRUCTION
Dowels
Fixing: If a dowel has an unpainted half, embed this in the concrete placed first.
Tolerances:
- Alignment: 2 mm in 300 mm.
- Location:  half the diameter of the dowel.
Grade: 250 N.
Supports
General: Provide proprietary concrete, metal or plastic supports to reinforcement in the form of chairs,
spacers, stools, hangers and ties, as follows:
- To be adequate to withstand construction and traffic loads.
- With a protective coating if they are ferrous metal extending to the surface of the concrete, or are
  used with galvanized or zinc-coated reinforcement.
Minimum spacing:
- Bars:  60 diameters.
- Fabric:  800 mm.
Supports over membranes: Prevent damage to waterproofing membranes or vapour barriers. If
appropriate place a metal or plastic plate under each support.
Projecting reinforcement
General: If ‘starter’ or other bars project beyond reinforcement mats or cages, through formwork or
from cast concrete, provide a plastic protective cap to each bar until it is incorporated into subsequent
work.




                                            Page 2 of 3                                     May 2009
Covered Outdoor Learning Area ( Large )
                                                                   0312 CONCRETE REINFORCEMENT



Tying
General: Secure the reinforcement against displacement by tying at intersections with either wire ties,
or clips. Bend the ends of wire ties away from nearby faces of forms so that the ties do not project into
the concrete cover.
Beams: Tie stirrups to bars in each corner of each stirrup. Fix other longitudinal bars to stirrups at 1 m
maximum intervals.
Bundled bars: Tie bundled bars together so that the bars are in closest possible contact. Provide tie
wire at least 2.5 mm diameter at centres  24 times the diameter of the smallest bar in the bundle.
Columns: Secure longitudinal column reinforcement to all ties at every intersection.
Mats: For bar reinforcement in the form of a mat, secure each bar at alternate intersections
Tolerances: To AS 3600 Section 19.
Welding
General: If welding of reinforcement is proposed, provide details.

3.2   COMPLETION
Unencased reinforcement
General: If ‘starter bars’ and other items project from cast concrete are exposed to the weather,
provide details of protection.




                                            Page 3 of 3                                     May 2009

								
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