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Figure 7
. Volumetric moisture content measurements at Torpsbruk test site along
county road 126 in southern Sweden.
Ground
Penetrating Radar
Ground Penetrating Radar (GPR) is a non-destructive testing technique that is used to
determine material thickness, frost depth, and groundwater table level as well as the
moisture content (Saarenketo and Scullion, 2000). This technique is usually used for
larger investigations such as monitoring the pavement system conditions at network
level. A GPR device is basically a radar system that uses a transmitter to send
electromagnetic waves. The electromagnetic wave penetrates the pavement structure
and the reflected wave is detected by a receiver. Based on the travel time and the
strength of the reflections, the dielectric constant of the material layers and therefore
their moisture content can be determined.
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