Discussion of aggregate and concrete water absorption and permeability testing methodology

This article presents the methodology used, in the Construction Laboratories, of Civil Engineering Department, of University of Beira Interior, for the determination of water absorption, oxygen and water permeability of concrete and aggregate. Aspects of samples preparation and of procedures of these tests are discussed, demonstrating that these two aspects can affect, significantly, the results obtained. It is also discussed here the significance of permeability determination when small differences in the variables of the tests occur, namely the applied pressure. Some examples of water absorption and of oxygen and water permeability obtained with different concrete types and different types of aggregates are presented. It is also presented a typical relationship between water absorption and oxygen permeability. Finally, it is concluded about the interest of the water absorption and permeability tests as parameters to evaluate concrete durability.

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