‘CLAM’ tests for measuring in-situ permeation properties of concrete

Muhammed Basheer, F.R. Montgomery, Adrian Long

    Research output: Contribution to journalArticlepeer-review

    40 Citations (Scopus)


    This paper descirbes a simple test measuring the sorptivity (a measure of the absorption property if concrete) and the air and water permeability of concrete on site. Using this test, the decay of pressure is monitired for the air permeability test.whereas water penetrating into the concrete at a constant pressure of 0.01 bar and 1.5 bar are recorded for the sorptivity and the water permeability tests respectively. These tests are essentially non-destructive in nature and a skilled operator is not needed. It is possible to carry out a number of tests quickly and efficiently on site without prior planning. It has been found that statistically satisfactory results can be obtained from a mean of three tests. As the flow lines are largely concentrated within 40 mm from the surface, reasonably reliable results can be obtained by drying the surface even if the surface under test is initially wet.

    Original languageEnglish
    Pages (from-to)53-73
    Number of pages21
    JournalNondestructive Testing and Evaluation
    Issue number1
    Publication statusPublished - 1995


    • Concrete
    • non-destructive test
    • in-situ test
    • permeability
    • sorptivity
    • durability
    • assessment


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