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Proceedings Paper

Detecting flaws in Portland cement concrete using TEM horn antennae
Author(s): Imad L. Al-Qadi; Sedki M. Riad; Wansheng Su; Rami H. Haddad
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Paper Abstract

To understand the dielectric properties of PCC and better correlate them with type and severity of PCC internal defects, a study was conducted to evaluate PCC complex permittivity and magnetic permeability over a wideband of frequencies using both time domain and frequency domain techniques. Three measuring devices were designed and fabricated: a parallel plate capacitor, a coaxial transmission line, and transverse electromagnetic (TEM) horn antennae. The TEM horn antenna covers the microwave frequencies. The measurement technique involves a time domain setup that was verified by a frequency domain measurement. Portland cement concrete slabs, 60 by 75 by 14 cm, were cast; defects include delamination, delamination filled with water, segregation, and chloride contamination. In this paper, measurements using the TEM horn antennae and the feasibility of detecting flaws at microwave frequency are presented.

Paper Details

Date Published: 13 November 1996
PDF: 12 pages
Proc. SPIE 2946, Nondestructive Evaluation of Bridges and Highways, (13 November 1996); doi: 10.1117/12.259150
Show Author Affiliations
Imad L. Al-Qadi, Virginia Polytechnic Institute and State Univ. (United States)
Sedki M. Riad, Virginia Polytechnic Institute and State Univ. (United States)
Wansheng Su, Virginia Polytechnic Institute and State Univ. (United States)
Rami H. Haddad, Virginia Polytechnic Institute and State Univ. (United States)


Published in SPIE Proceedings Vol. 2946:
Nondestructive Evaluation of Bridges and Highways
Steven B. Chase, Editor(s)

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