Acoustic emission historic index and frequency spectrum of reinforced concrete under accelerated corrosion

M. di Benedetti, G. Loreto, F. Matta, Antonio Nanni

Research output: Contribution to journalArticle

16 Scopus citations

Abstract

The main cause of degradation for reinforced concrete (RC) structures is the corrosion of the steel reinforcement. Laboratory tests aimed at studying durability are typically accelerated to provide usable results within a reasonable period of time, and well-established electrochemical techniques are used for the assessment of corrosion. However, because these techniques are not suitable for continuous monitoring and are often intrusive, nondestructive testing (NDT) techniques are also suitable for monitoring. Acoustic emission (AE) is one of the NDT techniques used to detect the onset and progression of corrosion. This paper presents an accelerated corrosion test setup and AE monitoring methodology based on the historic index, H(t), for laboratory experiments on RC specimens. Accelerated corrosion is attained by increasing the capillarity suction of RC exposed to chlorides. The frequency spectrum of the AE signals before and after the initiation of corrosion is investigated to isolate the frequency components associated with corrosion. It is shown that the AE signals generated by early corrosion excite a well-defined narrow band of the frequency spectrum.

Original languageEnglish (US)
Article number04014059
JournalJournal of Materials in Civil Engineering
Volume26
Issue number9
DOIs
StatePublished - Sep 1 2014

Keywords

  • Acoustic emission
  • Corrosion
  • Frequency spectrum
  • Historic index
  • Reinforced concrete
  • Steel reinforcement

ASJC Scopus subject areas

  • Building and Construction
  • Civil and Structural Engineering
  • Materials Science(all)
  • Mechanics of Materials

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