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Continuous Moisture Measurement during Pavement Foundation Construction
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2023-09-01
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[PDF-8.01 MB]
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Edition:Final Report, Feb 21 – Aug 23
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Abstract:The variations in electromagnetic and electric properties with the moisture content of several geomaterials were assessed in this report to demonstrate their viability in estimating the moisture content of compacted geomaterials. A prototype device was also designed and fabricated to estimate the moisture content of compacted geomaterials by measuring the complex resistivity (amplitude and phase shift between the voltage and current) of geomaterials over numerous frequencies. Two fine-grained soils, two sandy soils, and two coarse-grained geomaterials were selected as a baseline for laboratory measurements. These soils were compacted and tested to measure their dielectric constants, traditional resistivities, and their complex resistivities using the developed prototype. The dielectric constants were less sensitive and more uncertain to the moisture content variations than the resistivity values. The traditional and complex resistivity measurements showed promise in the laboratory. The same soils’ seismic moduli, unconfined compressive strengths, and lightweight deflectometer moduli were also established. For field implementation, a rolling four-electrode equatorial array was created and tested within the laboratory and MnROAD facility. Field polarization and deviation from expected voltages and currents occurred frequently. These results suggested that resistivity or complex-resistivity measurements with rolling four-electrode arrays may need significant improvement for controlling moisture content.
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