Permittivity scanning of asphalt in a transmission configuration across 7–17 GHz employing a phase compensation method

Martta Kaisa Olkkonen

Research output: Contribution to journalArticleScientificpeer-review

Abstract

This study aims at providing information about the structure of asphalt pavements by measuring the permittivity profile with small mechanical steps of 5 mm, employing a new computerized scanner that operates across the band 7–17 GHz. Two asphalt samples, a sawn slab and a drill core, are used as demonstration samples. A compensation procedure is proposed in order to reduce the effect of abrupt rotations in the phase due to granularities which are of the order of the wavelength. An average permittivity value was 5.01 for the slab and 5.27 for the drill core. Lower permittivity values relate to a lower air void content determined with a destructive laboratory reference measurement method.

Original languageEnglish
Pages (from-to)143-151
Number of pages9
JournalNDT & E INTERNATIONAL
Volume83
DOIs
Publication statusPublished - 1 Oct 2016
MoE publication typeA1 Journal article-refereed

Keywords

  • Asphalt
  • Composite material
  • Dielectric material characterization
  • Phase compensation
  • Scanning

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