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This work was supported by the Polytechnic Network VIA CARPATIA named after
“President of the Republic of Poland Lech Kaczy ´nski” financed by a special grant from the Minister
of Education and Science, contract number MEiN/2022/DPI/2577, action 7.
The lifecycle of wind turbine blades is around 20–25 years. This makes studies on the reuse
of dismantled blades an urgent need for our generation; however, their recycling is very difficult due
to the specific makeup of their composite material. In this study, the authors determined a concept
for the reuse of turbine blade sections filled with concrete for geotechnical structures, retaining the
walls, piles, or parts of their foundations. Working out detailed structural solutions to the above
problem should be preceded by the identification of material parameters. In particular, getting to
know the interface stress-strain characteristics is crucial. Therefore, this research focuses on the
cooperation between recycled FRP composites and concrete in load-carrying, including experiments
and numerical analyses. Regarding the two types of destructive stress, which may occur at the
interface under both compression and bending, two types of tests were executed: the ‘push-out test’,
modelling the interface’s answer to shear stress, and the ‘pull-off test’, demonstrating the interface’s
reaction to normal stress. Additionally, the strength parameters of the materials used were tested.
The numerical model for the push-out process was calibrated on the basis of the tests, and this way
the shear bond strength and the coefficient of friction between the concrete and the recycled FRP
laminate were assessed.
