Published: Građevinar 77 (2025) 4
Paper type: Subject review
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Assessment of the load-bearing capacity of the state road pavement structure

For the management system of modern pavements, data on the condition of the bearing capacity of the pavement, which refer to its condition during exploitation and at the end of the project period, are necessary. After the end of the project period of 20 years, it is necessary to plan reconstruction or strengthening of the pavement structure based on the parameters of the bearing capacity of the pavement. The data of the projected pavement layer thickness structures and those determined after 20 years of exploitation on samples from boreholes were compared. An example is the section of the state road D28, the northern bypass of Bjelovar, which was built and put into traffic in 2002. The deflection results of the measured falling weight deflectometer (FWD) on the subsections of the pavement, which were determined to be the most critical by visual inspection, were analysed. Based on the results of the calculated modulus of elasticity, the pavement structure was dimensioned by performing an additional cold recycled base layer with foamed bitumen. The importance of the pavement management procedure was emphasized on the example of the state road, as well as the delay in strengthening the pavement structure because the project period of 20 years has passed.

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