Detection and quantification of diameter reduction due to corrosion in reinforcing steel bars

Umar Amjad, Susheel Kumar Yadav, Tribikram Kundu

Research output: Contribution to journalArticlepeer-review

41 Scopus citations


Guided wave–based techniques are becoming popular for damage detection in pipes, rods, and plates. For monitoring reinforced concrete beams, the longitudinal guided wave is excited and recorded after its transmission through the reinforcing steel bar for estimating its corrosion level. Recorded signal amplitude is affected by the corrosion level. Thus, the corrosion level is estimated from the transmitted wave amplitude. Instead of investigating the amplitude of the transmitted guided waves, the differential time-of-flight of the propagating wave modes is recorded in this article. The differential time-of-flight is obtained from the time–frequency representations of the recorded transient signals and from the high temporal resolution using the cross-correlation technique. It is observed that the corrosion level can be quantified from the change in time-of-flight of the L(0,1) mode. The guided wave modes are experimentally generated, recorded, and compared with the theoretical dispersion curves to identify different modes and select the most efficient mode for quantifying the corrosion level. Unlike the recorded signal strength, the time-of-flight is not influenced by the bonding condition between the sensors and the specimen; therefore, the time-of-flight-based corrosion-monitoring technique is less influenced by the sensor bonding condition. This investigation is necessary because most investigators have studied the effect of corrosion on the recorded signal strength instead of its time-of-flight.

Original languageEnglish (US)
Pages (from-to)532-543
Number of pages12
JournalStructural Health Monitoring
Issue number5
StatePublished - Sep 7 2015


  • Guided wave
  • S-transform
  • corrosion
  • dispersion curves
  • short-time Fourier transform
  • steel bars
  • time-of-flight
  • wavelet transform

ASJC Scopus subject areas

  • Mechanical Engineering
  • Biophysics


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