The Structural Engineer's Corner

Eng. Onorio Francesco Salvatore

Class of concrete in Australia according to AS 3600 and AS 1379

Written By: Lexatus - Oct• 19•13

Concrete - Australia - Onorio

In Australia, two different types of concrete are specified and are:

– Normal-class;

– Special-class.

The Normal-class should have some attributes as defined in the AS 1379 and specified through some basic parameters. The parameters are:

– standard strength grade;

– slump at the point of acceptance;

– maximum nominal size of aggregate;

– method of placement;

– (if required) project assessment;

– (if required) level of air entrainment up to a maximum of 5%.

Concrete other than Normal-class shall be specified asSpecial-class and by strength grade (if applicable).

If the strength grade is applicable, the concrete shall be specified through some prefixes that are:

S, where compressive strength testing is required;

SF, where flexural strength testing is required;

ST, where indirect-tensile strength is required.

Where concrete is specified as Special-class and one of the exposure classification B1, B2, C1, C2 or U, as per AS 3600, is applicable, the following prefixes should be specified:

SB. for concrete in exposure classification B2;

SC, for concrete in exposure classification C1 or C2;

SU, for concrete in exposure classification U.

For the above SB, SC or SU the properties to be further specified shall include:

– the aggregate durability class, as per AS 2758.1;

– relevant requirements of AS 3600.



For any issues or questions, you can contact the author at:

Eng. Onorio Francesco Salvatore

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