Technology Gauges Asphalt Pavement Thickness

Currently, asphalt pavement thickness is measured with a ruler and controlled by a construction worker during the paving process. After each measurement, the layer thickness is readjusted. Errors are recognized and subsequently corrected after the next measurement.

Depending on the regularity and accuracy of these measurements, the results can drastically impact the road, thus affecting the whole project.

MOBA Mobile Automation has risen to this challenge and introduced the layer-thickness detection system, Pave-TM.

The system equips pavers with sonic thickness-measurement sensors on the tow arm and main screed. The sensors measure distance to the ground in front of the screed and thickness of the asphalt behind the screed within millimeter accuracy.

A special algorithm calculates deviations of the reference layer’s thickness, showing realtime values on a display. For the first time, ongoing as well as automatic control of layer thickness is made possible, and deviations over screed control can be corrected and optimized.

An additional sensor monitors and measures the temperature of the material on the auger. Two wire-rope sensors record the position of the rollout screed pieces, calculating the exact screed width.

By measuring distance through the paver distance signal or a combination of a GNSS (global navigation satellite system) antenna with a vibration sensor, the volume of the material laid can be determined. An estimate can then be made as to how much material was processed during installation, including material still needed to complete the job.

Two-color displays provide information about ongoing data like layer thickness, screed width, material volume and temperature. This allows the operator to get an overview and take action by informing others about asphalt material needed and installation speed. In addition, the optimized planning process reduces paver stops, increasing efficiency and reducing costs.

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