Civil Engineering Reference
In-Depth Information
60
We t
Saturated
Air-dried
50
Oven-dried
40
30
20
10
0
0 2 4 6
8 10
Distance from the Microwave Incident Surface (cm)
Figure 3.24
Radial compressive stress in concrete after 5 seconds of microwave heating
at 2.45-GHz frequency.
100
We t
Saturated
Air-dried
80
Oven-dried
60
40
20
0
0 2 4 6 8 10
Distance from the Microwave Incident Surface (cm)
Figure 3.25
Radial compressive stress in concrete after 2 seconds of microwave heating
at 10.6-GHz frequency.
It is interesting to note that, for a given microwave power and heating
period, higher microwave frequencies result in higher stresses being gener-
ated within a thinner surface layer of the concrete. The effect of microwave
frequency on the maximum thermal stresses generated in concrete speci-
mens with different water contents is shown in Figure 3.28. As seen, an
increase in microwave frequency can lead to significantly higher compres-
sive stresses.
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