โ Scribed by F. Capolino; P. Bussotti; L. Borselli; M. Albani; S. Maci
No coin nor oath required. For personal study only.
leads us to consider the influence of concrete age on the radiometric signals.
Figure 6 gives another type of result, namely, the radiometric signals in the case in which the medium is considered to be homogeneous. The more absorbent the medium, the weaker the signals collected. ลฝ It can be seen that an evolution of 3แ12 years i.e., a . reduction of 0.5 in permittivity over the entire depth corresponds to a small signal variation.
We think the dispersion of measurement data is the result of the ambient humidity that influences the first two centimeters of the concrete. In fact, hydration or dehydration phenomena in this layer change the relative permittivity considerably.
Microwave radiometry is a technique capable of distinguishing local thermal variations in concrete at thicknesses of the order of 10 cm, as a result of duct heating.
The feasibility study presented in this article examines a numerical model of this application, first in the case of constant permittivity and then considering the existence of a permittivity gradient within the concrete.
A better agreement between theory and experiment is observed when a permittivity gradient within the concrete is taken into account.
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