Annexure to Specification (2001) s1

Brisbane City Council

Reference Specifications for Civil Engineering Work

S200 Concrete Work – Annexure

COMMENTARY

USING THE DOCUMENTS

The latest edition of this annexure can be obtained by down loading from the Brisbane City Council internet site (www.brisbane.qld.gov.au) via the following path: Planning and building › Planning guidelines › Subdivision and Development Guidelines › Annexures to reference specifications for Civil Engineering work. The user can either mark up a paper copy to suit the proposed contract or edit the file direct in Microsoft Word 2010 (or later). Please note that the section and page breaks in the Microsoft Word file have been inserted to suit double-sided printing.

This annexure forms part of a two-part specification system. The corresponding reference specification and this annexure must be incorporated in the tender documents either by reference alone (quoting an edition date) or both by reference and physical inclusion.

The annexure modifies the reference specification by additions, deletions or amendments and takes precedence over any inconsistent provisions in the reference specification. In particular, the annexure adapts the reference specification to the technical needs for the particular project. However the user may, alternatively, employ a ‘Job Specification’ to convey job-specific information. If both annexure and job specification are used, the job specification takes precedence.

Because of the job-specific nature of the annexure, it is important to identify the project adequately in the header to the annexure or in the text of each section (either by description or by a contract serial number).

CONTRACTUAL PROVISIONS

The reference specification and annexure deal only with technical and administrative matters. They do not deal with commercial arrangements. It is most important that they are used in conjunction with an adequate contract, which makes all necessary commercial arrangements including provisions for measurement of work and methods of payment.

April 2014

Brisbane City Council

Reference Specifications for Civil Engineering Work

S200 Concrete Work – Annexure

Brisbane City Council

Reference Specifications for Civil Engineering Work

S200 Concrete Work – Annexure

INSPECTION (Clause 2.1)

Specify additional witness points for the Contract. [Insert the relevant requirements or insert ‘Not Applicable’]

Specify stages where notification is not required for the Contract. [Insert the relevant requirements or insert ‘Not Applicable’]

Specify hold points (i.e. work stages that cannot proceed without approval) in the Contract. [Insert the relevant requirements or insert ‘Not Applicable’]

SAMPLE PANELS (Clause 2.4)

AS 3610 makes test panels mandatory wherever colour control, surface treatment or Class 1 or Class 2 untreated surfaces have been specified. (Note: It may be advisable to have a test panel for shotcrete, although it is quite expensive to set up for a sample. Produce a 1m2 sample panel not less than 48 hours prior to commencing work on the job. The test panel shall be made by the applicator using the materials, equipment and operators to be used in the final work.) Specify the necessary requirements. [Insert the relevant requirements or insert ‘Not Applicable’]

Location of work / Finish / Sample panel size

CONTRACTOR’S SUBMISSIONS (Clause 2.5)

For multi-story work, it may be advisable to require formwork calculations and certification. Submit design calculations to show that allowable concrete stresses will not be exceeded if:

§ formwork procedures or loadings differ from the information included in the project documentation; and/or

§ project documentation does not include formwork shoring or stripping procedures or allowable loadings from stacked materials; and/or

§ props above a floor do not coincide with the props below.

Specify formwork location requiring certification by a suitably qualified structural engineer. For example, where required by the relevant safety regulations or formwork requiring vertical or raking support and vertical forms more than 900 mm high. [Insert the relevant requirements or insert ‘Not Applicable’]

PROTOTYPES (Clause 2.6)

Specify details of prototypes to be provided e.g. type, number, testing requirements, etc. [Insert the relevant requirements or insert ‘Not Applicable’]

FORMWORK – FORMED SURFACE FINISH (Clause 3.4)

The default provisions are in accordance with AS3610. Unless shown on the drawings, specify special surface finish requirements that deviate from AS3610. [Insert the relevant requirements or insert ‘Not Applicable’]

Surface finish to AS3610: (Class 1-5)
Concrete element or surface:
Integral finish:
Form lining type: (nominate a particular type of form lining)
Colour:

For concrete colour outside the normal grey scale, specify how the tonal range is to be measured. See AS 3610 Clause 3.5.

FORMWORK – STEEL REINFORCEMENT DECKING (Clause 3.9)

If applicable, specify details of temporary propping. [Insert the relevant requirements or insert ‘Not Applicable’]

MATERIALS – CONCRETE (Clause 4.1)

Special class concrete performance order

Typically normal class concrete is adequate. In specifying special class concrete, AS1379 gives you two options, either a performance order of a prescriptive order. (Note: With a special class performance order, you can change or add to the normal class requirements e.g. the addition of fibres or early age strength limitations. The manufacturer accepts the order on a ‘performance’ basis. The manufacturer is entitled to decline the order, so it is advisable to check availability before specifying. AS 1379 Appendix B gives some good guidance.) [Insert the relevant requirements or insert ‘Not Applicable’]

Grade (S20/S25/S32/S40/S50):
Location in the Works:
Special requirements:

Special class concrete prescriptive order

With a special class prescriptive order you need to specify just about everything, including testing of materials. The manufacturer supplies the product as per your design and accepts no responsibility for its performance. Mixes would best be developed and trialled in conjunction with the eventual supplier and using their aggregates. Even then, difficulties can be expected given normal variations in aggregates with time. The following parameters are provided for suggestions only. [Insert the relevant requirements or insert ‘Not Applicable’]

Mix application
Minimum cement content (kg/m3):
Cement source:
Cement type:
Cement colour:
Coarse aggregate
Source:
Type:
Size (mm):
Proportions (kg/m3):
Fine aggregate
Source:
Type:
Size (mm):
Proportions (kg/m3):
Water: cement ratio
Maximum value:
Admixtures
Types:
Proportions:

Aggregate details

Unless aggregate is specified satisfactorily by source and type above, it will be necessary to specify it in detail. Do not do both.

Aggregate water absorption, maximum (%):

Specify for each exposure classification U to AS3600. (Conduct aggregate durability assessment in accordance with AS 2758.1 for the exposure classification defined in AS3600.)

Minimum wet strength (kN):
Maximum wet/dry strength variation (percent):

Los Angeles Value:
Sodium Sulphate Soundness:

Los Angeles Value:
Maximum unsound stone content:
Total of unsound stone and marginal stone:

Concrete schedule

Unless shown on the drawings, specify the concrete required for each element. Typically, only the strength grade and nominal aggregate size need be specified. Slump and method of placement are generally the Contractor's business; only specify them if they are critical to the design. Project assessment would only be appropriate on a really large job, say >1000m3. You are permitted to specify level of air entrainment and early strength development if necessary. [Insert the relevant requirements or insert ‘Not Applicable’]

Location in the Works:
Strength grade (N20/N25/N32/N40/N50):
Slump (40/ 60/ 80/ 100 mm):
Nominal aggregate size (10/ 14/ 20 mm):
Method of placement (better to leave to Contractor):
Project Assessment (required/ not required):
Level of air entrainment (up to 5.0% in Class N):
Early strength development (E3/E7):

CONCRETE TYPES (Clause 4.3)

Foamed concrete

Specify details. [Insert the relevant requirements or insert ‘Not Applicable’]

Required maximum density:

Proprietary system:
Description:

Steel fibre concrete

For design and specification, refer to BHP Fibresteel Technical Manual or similar publications. Specify details. [Insert the relevant requirements or insert ‘Not Applicable’]

Concrete
Strength grade (S20/S25/S32/S40/S50 Performance):
Nominal aggregate size (10/14/20 mm):
Fibre content (e.g. 75 kg/m3):
Steel fibres
Manufacturer:
Product name:
Designation:

Glass fibre reinforced concrete

Specify details. [Insert the relevant requirements or insert ‘Not Applicable’]

REINFORCEMENT (Clause 4.4)

Reinforcement schedule

You have to nominate the requirements for all reinforcing steel. If the project has drawings, it s best to put the requirements there. The standards are already called up so reinforcement can be specified by grade designation. The reference specification has defaults for supports and tie wires. These would normally only be specified here for coated bars, and then only if the defaults do not suit. [Insert the relevant requirements or insert ‘Not Applicable’]

Structural element / Reinforcement type / Coating / Support type / Tie wire

Protective coated reinforcement

Unless shown on the drawings, specify for each type of coated reinforcement. [Insert the relevant requirements or insert ‘Not Applicable’]

Coating type:
Standard (if one is available):
Reinforcement cover schedule:
Concrete surface / Minimum cover (mm)
Cast against ground
Cast on vapour barrier
Formed and backfilled
Exposed externally
Enclosed/interior

PLACING AND COMPACTION (Clause 6.2)

Sequence of pours

Unless shown on the drawings, specify sequence of pours and any particular issue with crack control. [Insert the relevant requirements or insert ‘Not Applicable’]

Minimum time delay schedule

[Insert the relevant requirements or insert ‘Not Applicable’]

Between (pour locations) / Minimum period between adjacent pours (days)
Adjacent pours abutting vertical construction joints in walls
Adjacent pours abutting horizontal construction joints in walls or columns
‘Closing strips’ and adjacent concrete

CURING (Clause 6.7)

The reference specification already covers issues of compatibility with applied finishes, and defines standards. Unless shown on the drawings, stipulate curing methods. [Insert the relevant requirements or insert ‘Not Applicable’]

Concrete surface / Curing method

PRESTRESSING – TENDONS (Clause 7.1)

Unless shown on the drawings, specify prestressing schedule including type and grade of strand, wire or bar. State the number and nominal diameter of strand, wire or bars in each tendon. Alternatively, tendons may be specified in terms of capacity and relaxation properties only. [Insert the relevant requirements or insert ‘Not Applicable’]

Structural element / Tendon material / Tendon size (mm)

EXPANSION JOINTS (Clause 9.2)

Unless shown on the drawings, specify jointing material schedule. [Insert the relevant requirements or insert ‘Not Applicable’]

Location of joint / Jointing material / Joint filling material

WATERSTOPS (Clause 9.6)

Unless shown on the drawings, specify for each type of waterstop. [Insert the relevant requirements or insert ‘Not Applicable’]

Location:
Supplier:
Suppliers designation
Size:
Jointing method (if the manufacturer gives options):

CONCRETE SURFACE FINISH (Clause 10.1)

Any surface which needs anything but the default off-form finish of the class specified needs to be defined. It would normally be on the drawings for civil work but can be done here.

Specify for each type of exposed aggregate finish. [Insert the relevant requirements or insert ‘Not Applicable’]

Location:
Coarse aggregate source:
Description of coarse aggregate:
Caution: choose aggregate with adequate slip-resistance for the application.
Cement source:
Cement description:
If there are no particular requirements, insert ‘unspecified’.
Concrete pigment source:
Concrete pigment description:
Concrete pigment dosage rate:
If no pigmentation of the matrix is required, specify ‘none’.

Specify for each type of bush hammered finish. [Insert the relevant requirements or insert ‘Not Applicable’]

April 2014