COVER ZONE PROPERTIES INFLUENCING ACOUSTIC EMISSION DUE TO CORROSION

The cover zone of reinforced concrete provides the only barrier to aggressive species, which either attack the concrete directly or initiate corrosion of the reinforcement. Depending on the rebar spacing, rebar and cover dimensions, the delamination of the concrete cover can occur, resulting in a loss of bone with the reinforcement; this can be a serious serviceability issue. Acoustic emission (AE) is an inspection technique that detects elastic waves due to material microfracture. This article examines the effects of the cover zone properties on the magnitude of AE energy against a normalized mass loss. The authors studied prisms with various combinations of strength, cover thickness, aggregate and rebar diameters to ascertain the important variables likely to be encountered on reinforced structures. Their experimental results confirmed that early corrosion, verified by internal visual inspection and mass loss, can be detected by AE and before any external signs of cracking. They also show that the most influential parameter affecting the AE measurement is concrete strength, being exponentially related to the AE energy. The authors note that material properties, such as cover thickness, had a negligible effect on AE energy during the initial stages of reinforcement corrosion. However, keeping the cover thickness constant and varying the rebar diameter suggested a potential relationship.

  • Availability:
  • Corporate Authors:

    Elsevier

    The Boulevard, Langford Lane
    Kidlington, Oxford  United Kingdom  OX5 1GB
  • Authors:
    • Ing, M
    • Austin, S
    • Lyons, R
  • Publication Date: 2005-2

Language

  • English

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00989028
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Apr 29 2005 12:00AM