13 November 1996 Detecting flaws in Portland cement concrete using TEM horn antennae
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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.
© (1996) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Imad L. Al-Qadi, Sedki M. Riad, Wansheng Su, Rami H. Haddad, "Detecting flaws in Portland cement concrete using TEM horn antennae", Proc. SPIE 2946, Nondestructive Evaluation of Bridges and Highways, (13 November 1996); doi: 10.1117/12.259150; https://doi.org/10.1117/12.259150
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KEYWORDS
Dielectrics

Transmission electron microscopy

Antennas

Cements

Microwave radiation

Contamination

Control systems

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