Estimation of corrosion damage in steel reinforced mortar using waveguides

Henrique Reis, Benjamin L. Ervin, Daniel A. Kuchma, Jennifer Bernhard

Research output: Contribution to journalConference articlepeer-review

Abstract

Corrosion of reinforced concrete is a chronic infrastructure problem, particularly in areas with deicing salt and marine exposure. To maintain structural integrity, a testing method is needed to identify areas of corroding reinforcement. For purposes of rehabilitation, the method must also be able to evaluate the degree, rate and location of damage. Towards the development of a wireless embedded sensor system to monitor and assess corrosion damage in reinforced concrete, reinforced mortar specimens were manufactured with seeded defects to simulate corrosion damage. Taking advantage of waveguide effects of the reinforcing bars, these specimens were then tested using an ultrasonic approach. Using the same ultrasonic approach, specimens without seeded defects were also monitored during accelerated corrosion tests. Both the ultrasonic sending and the receiving transducers were mounted on the steel rebar. Advantage was taken of the lower frequency (<250 kHz) fundamental flexural propagation mode because of its relatively large displacements at the interface between the reinforcing steel and the surrounding concrete. Waveform energy (indicative of attenuation) is presented and discussed in terms of corrosion damage. Current results indicate that the loss of bond strength between the reinforcing steel and the surrounding concrete can be detected and evaluated.

Original languageEnglish (US)
Article number13
Pages (from-to)98-107
Number of pages10
JournalProceedings of SPIE - The International Society for Optical Engineering
Volume5767
DOIs
StatePublished - Oct 7 2005
EventNondestructive Evaluation and Health Monitoring of Aerospace Materials, Composites, and Civil Infrastructure IV - San Diego, CA, United States
Duration: Mar 8 2005Mar 10 2005

Keywords

  • Accelerated corrosion tests
  • Mortar
  • Reinforced concrete
  • Ultrasonics
  • Waveguides

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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