Materials and Structures

, Volume 46, Issue 10, pp 1723–1735 | Cite as

Effect of moisture on the reliability of void detection in brickwork masonry using radar, ultrasonic and complex resistivity tomography

  • Patricia Cotic
  • Zvonko Jaglicic
  • Ernst Niederleithinger
  • Ute Effner
  • Sabine Kruschwitz
  • Christiane Trela
  • Vlatko Bosiljkov
Original Article

Abstract

The influence of moisture on the reliability of detection of larger voids in brickwork masonry was investigated using three non-destructive techniques: radar, ultrasonic and complex resistivity (CR). Radar and ultrasonic travel time tomography, as well as CR tomography, were performed over a specific cross section of a specimen containing a large void at a known position to determine the influence of different levels of moisture content in the brickwork on the wave velocities and the CR magnitude. We defined a numerical estimator to quantitatively determine the void detection efficiency from the images obtained when exposing the specimen to moisture. The results showed radar to be the most reliable technique for void detection in both dry and wet masonry, while CR performed much better in detecting larger air voids in wet masonry.

Keywords

Radar, ultrasonic and complex resistivity tomography Masonry Moisture Void detection 

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Copyright information

© RILEM 2013

Authors and Affiliations

  • Patricia Cotic
    • 1
    • 2
  • Zvonko Jaglicic
    • 1
    • 2
  • Ernst Niederleithinger
    • 3
  • Ute Effner
    • 3
  • Sabine Kruschwitz
    • 3
  • Christiane Trela
    • 3
  • Vlatko Bosiljkov
    • 2
  1. 1.Institute of Mathematics, Physics and MechanicsLjubljanaSlovenia
  2. 2.Faculty of Civil and Geodetic EngineeringUniversity of LjubljanaLjubljanaSlovenia
  3. 3.BAM Federal Institute for Materials Research and TestingBerlinGermany

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