Frequency-dependent dispersion of high-frequency ground penetrating radar wave in concrete

Wai Lok Lai, T. Kind, H. Wiggenhauser

Research output: Journal article publicationJournal articleAcademic researchpeer-review

31 Citations (Scopus)

Abstract

This paper studies the dielectric dispersion of high frequency radar wave in concrete in early-aged and hardened concrete specimens. Frequency-dependent spectra of phase velocity v(ω) were measured to deduce the spectra of real part of dielectric permittivity ε′(ω). The dispersion was measured by three high nominal ground penetrating radar frequencies (1.5, 1.6 and 2.6 GHz), experimenting on two steel bars with concrete cover 50 and 100 mm. It was found that v(ω) and ε′(ω) dispersed at lower frequency, but became stable at high frequency regions, which agrees with the classical GPR plateau. The same frequency components at different nominal antenna frequencies show a close range of v(ω) and ε′(ω) in concrete of different ages. The results in this paper warrant further investigation of using GPR wave to study material properties.
Original languageEnglish
Pages (from-to)267-273
Number of pages7
JournalNDT and E International
Volume44
Issue number3
DOIs
Publication statusPublished - 1 May 2011
Externally publishedYes

Keywords

  • Concrete
  • Frequency-dependent dielectric dispersion
  • Ground penetrating radar (GPR)
  • Phase velocity
  • Real part of dielectric permittivity

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanical Engineering
  • Condensed Matter Physics

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