SG314

Concrete - In Situ

ID
Title
Compliance Level
Expand All
1
General
Mandatory
Mandatory

As per current NATSPEC except as follows:

1.6 Shrinkage Sensitive Structures 
 
GUIDE NOTE:  Add subclause “Shrinkage Sensitive Structures” to NATSPEC Building Template/Worksection 
 
The drying shrinkage limits for the concrete in any part of the works shall, where required, be as specified for that part and shall be measured by submitting samples to drying shrinkage tests as specified.  The measure of drying shrinkage shall be the percentage change in dimension of the sample after a period of 8 weeks, in accordance with AS 1012.13 Methods of testing concrete - Determination of the drying shrinkage of concrete...
 
Unless otherwise specified the maximum permissible drying shrinkage shall be as follows:

 

F'c (MPa)

Shrinkage (microstrain)

10, 15, 20

600

25, 32 ,40, 45, 50

700
1.7 Submissions 
 
GUIDE NOTE: Re-number subclause 1.6 “Submissions” as 1.7 in NATSPEC Building Template/Worksection and add the text below: 
 

Testing authority
Submit names of the testing authority and personnel engaged in sampling, preparing and handling test specimens to the Principal’s Authorised Person / Principal’s Representative for approval.  The testing authority must be NATA registered

Curing compounds
 
GUIDE NOTE: Add to existing curing compounds subclause in NATSPEC Building Template
 
Do not use ineffective or inappropriate curing compounds.   Do not use wax-based or chlorinated rubber-based curing compounds on surfaces forming substrates to toppings such as concrete toppings and cement-based render.  Apply as a continuous coating without visible breaks or pinholes, at the rate recommended by the manufacturer.
 
Coarse aggregate

To AS 2758.1 Sampling and Testing to AS 1141& AS1012

If so directed by the Principal’s Authorised Person / Principal’s Representative, and under his supervision, take in accordance with AS 1141 a 50 kg sample of each aggregate type, individually or in combination proposed for use in the concrete mix, and submit to the approved NATA registered independent testing authority three weeks prior to commencement of concrete supply.  Accompany the samples with a written request stating the particular tests required by the Principal’s Authorised Person / Principal’s Representative.  In the case of individual aggregate samples, state the mix proportions proposed.  The cost of such handling and testing of the aggregate shall be treated as a variation to the Contract.
 

Specimen store

GUIDE NOTE:  Add "Specimen Store" subclause to NATSPEC Building Template for remote sites at which samples cannot be immediately transported to the testing laboratory 

Construct the store prior to pouring of any concrete on site.
  • Purpose: For making and storing of test specimens
  • Structure: Provide a level waterproof rigid floor and weatherproof walls and roof
Store shall be a minimum 2500mm x 1800mm x 2400mm high internally.  Provide the structure with a lockable door capable of giving complete protection to the test specimens.
  • Storage Conditions:  To AS 1012, Part 8, Clause 1.7 for Standard Temperature Zone.
1.8 Specimen Demoulding and Transport 
 
GUIDE NOTE:  Add subclause “Specimen Demoulding and Transport” to NATSPEC Building Template/Worksection 


Standard

To AS 1012, Part 8, clauses 1.8.1 and 1.9 except as follows:-

  • The specimen shall remain in its metal mould for 24 hours, without movement, before de-moulding.
  • Sydney Metropolitan Area:  Preference shall be given to sub-clause (a) or (b) in clause 1.8.2 of AS 1012.
 
Site De-moulding:  When carried out, remove each specimen from its mould in the presence of the Principal’s Authorised Person / Principal’s Representative, who will indelibly mark the side of each specimen for identification.
 
NATA Laboratory Handling:  If cylinders have been cast by the approved independent testing authority, the authority will be permitted to de-mould and transport the concrete specimens to its laboratories, in the same manner as that in which the authority would normally process specimens.  Under these circumstances, specimens for 28 day testing shall be delivered to the testing laboratory no later than 14 days prior to the due date, and specimens for 7 day testing no later than 3 days prior to the due date. 
 
Country Areas: Where direct transport can be affected within reasonable time such as in the Newcastle and Port Kembla areas, the provisions covering the Sydney Metropolitan Area shall apply. 
 
Remote Country Areas:  The requirements of AS 1012, Clause 1.8.2 paragraph (c) or (d) may be modified such that should lime saturated water storage not be available, storage in damp sand in a purpose-made tray is permitted, provided the sand is kept continuously damp and temperature requirements are maintained.
 
2
Products
Mandatory
Mandatory

As per current NATSPEC except as follows:

2.1 Materials
 
GUIDE NOTE: Add the following text to existing subclause in NATSPEC Building Template 
 

General
Use materials complying with Australian Standards.  Do not use breccia or dolerite in concrete mixes and limit fly ash content to 20% by weight of cementitious content.

Aggregate

Coarse aggregate Types: 

  • Washed crushed river gravel, fine-grained basalt, or other materials approved by the Principal’s Authorised Person / Principal’s Representative.  State the source of the aggregate on delivery dockets.  Obtain approval before changing the source of the aggregate.
  • Metallurgical furnace slag aggregate: To AS 2758.1 Clause 16, except that non-ferrous slags must not be used.
Cement

Cement type: Portland cement to AS 3972 

2.2 Concrete
 
GUIDE NOTE: Add the following text to existing subclause in NATSPEC Building Template 


Coloured concrete

2.3 Testing
 
GUIDE NOTE: Add text below “Project Assessment Strength Grade Sampling Table” in NATSPEC Building Template/Worksection
 
Additional to the above, hardened concrete represented by any one sample with a test strength less than 0.8 times the required characteristic strength shall be liable to rejection.
 
Rejected concrete shall be removed from the site.
 
3
Execution
Mandatory
Mandatory

As per current NATSPEC except as follows:

3.3 Cores, Fixings and Embedded Items
 

Penetrations 
Termite barrier:

GUIDE NOTE:  Refer to SG / COMMON REQUIREMENTS - TERMITE MANAGEMENT
 
Chemical Barriers: Must not be used (Mandatory)
3.7 Joints
 

Construction joints
Termite barrier:

GUIDE NOTE:  Refer to SG / COMMON REQUIREMENTS - TERMITE MANAGEMENT

Chemical Barriers: Must not be used (Mandatory)
 
 

Expansion joints
Termite barrier:

GUIDE NOTE:  Refer to SG / COMMON REQUIREMENTS - TERMITE MANAGEMENT

Chemical barriers: Must not be used (Mandatory)
Home > Specification Guide > Concrete - In Situ