Title :
Measurement and monitoring of microwave reflection and transmission properties of cement-based specimens
Author :
Kharkovsky, Sergey N. ; Akay, Mehmet F. ; Hasar, Ugur C. ; Atis, Cengiz D.
Author_Institution :
Inst. for Radio-Phys. & Electron., Nat. Acad. of Sci. of Ukraine, Kharkov, Ukraine
fDate :
12/1/2002 12:00:00 AM
Abstract :
The results of measurement and monitoring of reflection and transmission properties of cement-based specimens (blocks of mortar, concrete) obtained by using a simple and an inexpensive measurement system at microwave frequencies (X-band) are presented. Dependencies of the reflection and transmission coefficients on water-to-cement (w/c) ratio, preparing and curing conditions of the specimens are demonstrated. It is shown that the amplitudes of reflection and transmission coefficients, together with thickness of the specimens, determine the complex dielectric permittivity of the hardened cement-based specimens. The expected applications of the results for the determination of physical properties of cement-based materials are discussed. The causes and effects of measurement errors and uncertainties are also discussed.
Keywords :
cements (building materials); concrete; condition monitoring; curing; measurement errors; measurement uncertainty; microwave measurement; microwave reflectometry; permittivity measurement; X-band measurement system; cement-based specimens; complex dielectric permittivity; concrete; curing conditions; hardened cement-based specimens; measurement errors; measurement uncertainties; microwave reflection; microwave transmission properties; monitoring; mortar blocks; physical properties; preparing conditions; reflection coefficients; specimen thickness; transmission coefficients; water-to-cement ratio; Concrete; Curing; Dielectric measurements; Frequency measurement; Microwave frequencies; Microwave measurements; Monitoring; Mortar; Permittivity; Reflection;
Journal_Title :
Instrumentation and Measurement, IEEE Transactions on
DOI :
10.1109/TIM.2002.808081
