Concrete, hardened: Accelerated chloride penetration (NT BUILD 443)

  • Report #: NT BUILD 443
  • Approved: November 1995
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This Nordtest method specifies a procedure for the determination of penetration parameters for estimating the resistance against chloride penetration into hardened concrete or other cement-based materials. The resistance against chloride penetration is determined by accelerated testing.


The method is applicable to test specimens from existing structures and to new samples older than 28 maturity-days. The concrete test specimens must be free from construction faults such as cavities and visible cracks. It is important to keep in mind that the values for the chloride penetration parameters are dependent on concrete maturity. Especially concretes containing pozzolans will not have reached optimum maturity after a period of 28 maturity-days, which is the specified minimum curing time before exposure. Deviations from the requirements of the method concerning exposure temperature, exposure time, together with the composition and the chloride concentration of the exposure liquid, can be made where required by the purpose of the test. In case of any deviations, it must be stated in the test report that the results are obtained from a modified test and the deviations must be specified. Parameters of importance for the resistance against chloride penetration are e.g. composition, workmanship, surfacing, curing, age.

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