UkrainianProfessional Education

Abstract

The method of assessing the bearing capacity of road surfaces by the dynamic loading method using the Fast-Falling-Weight-Deflectometer (FFWD) equipment was investigated. It was determined that the use of FFWD equipment provides accelerated data collection and their rapid return, if compared with previous versions of installations with deflectometers or analogues. The repeatability of the test using the FFWD method ensures the reliability of the obtained results, in particular, the standard test is performed three times with the same load or through a progressive pulse with increasing load. The result of field measurements of the strength of road surfaces using the FFWD method is to obtain their deformation characteristics, which are presented in the form of a profile of the surface deformation (deflection basin) in specialized software. The outline of the deflection basin is formed by the location points of the sensors for registering vertical surface movement (geophones), which are installed in a line along the traffic lane in an optimal number of nine units. Analysis of the obtained data on the deformation of the pavement surface by the FFWD method allows to identify potential weak points in the road structure. In turn, this is a prerequisite for planning measures to strengthen or restore road structures, and is also the basis for economically calculating the amount of financing for these works. The FFWD method still requires additional testing in Ukrainian conditions, so further research will concern the practical application of the method in modern conditions

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