Longitudinal Flatness of Road Pavements Measured with Profilometer and Universal Curvimeter “Rovnost''

The use of road profilometers is currently the main tool to measure the longitudinal flatness of road pavements in accordance with standards. Measurement methods of road pavement flatness using profilometers fundamentally differ from those based on leveling.

Purpose: The purpose of the work is to compare measurements of road flatness with profilometers and the amplitude method.

Methodology/approach: Comparative analysis, profilometer based measurement, curvimeter based measurement. The curvimeter "Rovnost" is used to measure elevation marks, unevenness amplitude and length, and data conversion into integral indicators in accordance with the requirements.

The difference between these methods lies in measuring the amplitude and length of irregularities, as well as in the work organization, preparation for measurements and their implementation, accuracy and stability of measurement results. Factors affecting the measurement accuracy also fundamentally differ.

Each profilometer requires calibration. Calibration compares the data obtained by the profilometer with the data of short-step geometric leveling, and calculates the scale factor. The scale factor considers all characteristics of vehicles and calibration conditions. When these conditions change during measurements, it is theoretically possible to take into account the changes in the scale factor, but it is difficult in practice.

The main limitation of short-step leveling is its high labor intensity. This method can be used in large volumes when solving the problem of automating the leveling process.

Research findings: The proposed device provides short-step leveling in the automatic mode at a step of 5 to 15 cm and measurement accuracy of height increments of 1 mm. The curvimeter "Rovnost" is used for flatness measurements. External factors do not have a significant effect on the measurement accuracy of the "Rovnost" curvimeter.

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