Deformation fatigue fibroproliferative concrete under dynamic effects
DOI:
https://doi.org/10.24866/2227-6858/2024-3/74-81Keywords:
fibroconcrete, polypropylene, deformative fatigue, cyclic loading, dynamic effectsAbstract
The work is devoted to an experimental evaluation of the effectiveness of using fibrillated polypropylene fibers to increase the fatigue resistance of cement-containing matrices. The kinetics of deformations of conventional and fiber-reinforced polypropylene concrete repeated cyclic impacts with a stress amplitude of n = 0.6 – 0.8 and zero asymmetry are studied. The consequences of dynamic loads are analyzed based on the results of static compression tests of control and experimental samples at a constant deformation rate of 0.04 mm/s. Comparison of significant fatigue resistance indicators was performed using multi-link diagrams that consider the physical regularities of deformation transformation at the stages of increasing and spontaneous load drop. It was found that fibro propylene concrete increases the internal fatigue resistance of cement-containing matrices due to an increase in the potential for plastic deformation and structural modification, which contributes to a decrease in the response to dynamic influences.
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