Imaging and parameterizing moisture in road sub course using time domain reflectometry
- Platt, I
- Woodhead, I
- Harrington, P
- Tan, AE-C
DOIAbstract
This paper presents the experimental results of using a non-invasive time domain reflectometry (TDR) sensor to image and parameterize the moisture content of basecourse materials used in road construction. Imaging, resulting from the amplitude losses of a pulsed signal travelling down TDR transmission lines, is found to produce excellent information on the relative changes in basecourse moisture content to a spatial resolution <5 mm in the plane of the road surface. A simple model relating the volumetric moisture content to the TDR measured propagation time is shown to provide a consistent transform between the two. The experimental data also indicate that the smallest transform error of ~0.25% in volumetric moisture content is achieved whe...
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