The Structural Engineer's Corner

Eng. Onorio Francesco Salvatore

Acid-soluble chloride, sulfate, shrinkage strain and other characteristic attributes for Normal-class concrete

Written By: Lexatus - Oct• 19•13

Concrete cylinder - Onorio

In a previous post we have seen as the concrete in Australia is divided in Normal-class and Special-class. For the first one, the following are characteristic attributes:

  • Mass per unit volume in the range of 2100 kg/m³ to 2800 kg/m³;
  • Acid-soluble chloride shall not exceed:
    • 0.8 kg/m³ for exposure classifications A1 and A2;
    • the lesser of 0.8 kg/m³ or the customer’s specified limits for exposure classifications other than A1 and A2.
  • Acid-soluble sulfate shall not exceed 50 g/kg of cement;
  • Shrinkage strain not exceeding 1000 x 10^(-6) after 56 days of drying;
  • Mean compressive strength at 7 days of not less than:
    • 9 MPa for N20;
    • 12 MPa for N25;
    • 16 MPa for N32;
    • 20 MPa for N40;
    • 25 MPa for N50.
  • Cement complying with AS 3972;
  • No lightweight aggregate as defined in AS 2758.1.


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Eng. Onorio Francesco Salvatore

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