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Title: Permittivity of Portland cement concrete at low RF frequencies

Abstract

Portland cement concrete (PCC) specimens were cast and most cured for 28 days. Their complex permittivity was measure dover a frequency ranger of 100 kHz--40 MHz as part of an ongoing study intended to develop a database of electromagnetic properties of PCC. Such information would allow the improvement of current nondestructive evaluation (NDE) methods used to evaluate concrete structures. Low RF (radio frequency) measurements were carried out using a parallel plate capacitor setup connected to an HP 4195A Network/Spectrum Analyzer, Using a complex capacitance model for the capacitor, the complex permittivity of twelve different PCC mixes was evaluated; measurements were performed on four specimens per batch. The selected mixes included three water-to-cement (w/c) ratios, two aggregate types, and two levels of entrained air content; Type 1 portland cement was used. Preliminary measurements showed that the dielectric constant of the concrete specimens varied over frequency from nearly 150 at 1 MHz to around 6 at 40 MHz after 28 days of moist curing. Measured loss tangent was in the range of 0.86--1.8 at 1 MHz and 1.0--2.9 at 40 MHz. A significant effect of w/c ratio, type of aggregate, air entrainment, and the curing state of specimens was observed.

Authors:
; ; ;  [1];  [2]
  1. Virginia Polytechnic Inst. and State Univ., Blacksburg, VA (United States). Bradley Dept. of Electrical Engineering
  2. Virginia Polytechnic Inst. and State Univ., Blacksburg, VA (United States). Via Dept. of Civil Engineering
Publication Date:
OSTI Identifier:
7301086
Resource Type:
Journal Article
Journal Name:
Materials Evaluation; (United States)
Additional Journal Information:
Journal Volume: 52:4; Journal ID: ISSN 0025-5327
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; 36 MATERIALS SCIENCE; CONCRETES; ELECTROMAGNETIC TESTING; PERMITTIVITY; PORTLAND CEMENT; DIELECTRIC PROPERTIES; EXPERIMENTAL DATA; BUILDING MATERIALS; CEMENTS; DATA; ELECTRICAL PROPERTIES; INFORMATION; MATERIALS; MATERIALS TESTING; NONDESTRUCTIVE TESTING; NUMERICAL DATA; PHYSICAL PROPERTIES; TESTING; 420500* - Engineering- Materials Testing; 360606 - Other Materials- Physical Properties- (1992-)

Citation Formats

Su, W, Hazim, O A, Al-Qadi, I L, Riad, S M, and Al-Qadi, I L. Permittivity of Portland cement concrete at low RF frequencies. United States: N. p., 1994. Web.
Su, W, Hazim, O A, Al-Qadi, I L, Riad, S M, & Al-Qadi, I L. Permittivity of Portland cement concrete at low RF frequencies. United States.
Su, W, Hazim, O A, Al-Qadi, I L, Riad, S M, and Al-Qadi, I L. Fri . "Permittivity of Portland cement concrete at low RF frequencies". United States.
@article{osti_7301086,
title = {Permittivity of Portland cement concrete at low RF frequencies},
author = {Su, W and Hazim, O A and Al-Qadi, I L and Riad, S M and Al-Qadi, I L},
abstractNote = {Portland cement concrete (PCC) specimens were cast and most cured for 28 days. Their complex permittivity was measure dover a frequency ranger of 100 kHz--40 MHz as part of an ongoing study intended to develop a database of electromagnetic properties of PCC. Such information would allow the improvement of current nondestructive evaluation (NDE) methods used to evaluate concrete structures. Low RF (radio frequency) measurements were carried out using a parallel plate capacitor setup connected to an HP 4195A Network/Spectrum Analyzer, Using a complex capacitance model for the capacitor, the complex permittivity of twelve different PCC mixes was evaluated; measurements were performed on four specimens per batch. The selected mixes included three water-to-cement (w/c) ratios, two aggregate types, and two levels of entrained air content; Type 1 portland cement was used. Preliminary measurements showed that the dielectric constant of the concrete specimens varied over frequency from nearly 150 at 1 MHz to around 6 at 40 MHz after 28 days of moist curing. Measured loss tangent was in the range of 0.86--1.8 at 1 MHz and 1.0--2.9 at 40 MHz. A significant effect of w/c ratio, type of aggregate, air entrainment, and the curing state of specimens was observed.},
doi = {},
journal = {Materials Evaluation; (United States)},
issn = {0025-5327},
number = ,
volume = 52:4,
place = {United States},
year = {1994},
month = {4}
}