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Waste fibres coming from the recycling process of the old tires were incorporated in slurry infiltrated fibre concrete (SIFCON), which is a special type of high performance fibre reinforced concrete with high fibre content. The technological feasibility (i.e. suitability of the waste fibres for SIFCON technology) was assessed using infiltration test and homogeneity test. Test specimens were prepared with three volume fractions (5; 7.5 and 10% by vol.) of waste unclassified fibres. SIFCON with industrial steel fibres (10% by vol.) and high performance fibre concrete with industrial fibres were also cast and tested for comparison purposes. Quasi-static mechanical properties were determined. The impact test was carried out by using an in-house manufactured impact testing machine based on drop test principle. Realized tests confirmed the possibility of using the waste fibres for SIFCON technology. The obtained results indicate, that the usage of waste fibres does not significantly reduce the values of SIFCON flexural and compressive strength at quasi-static load and energy absorption at dynamic load, the values were comparable to the specimens with industrially produced fibres. With increasing fibre content, the mechanical parameters and energy-absorption characteristics at dynamic load are increasing as well.

Energy-absorbing materials represent an important group of products in the field of increasing the safety of citizens. Research and development including physical properties testing leads to improvement of these materials and protective constructions. Two types of fillers were chosen for testing: macro and microfillers, together with a two-component polyurethane binder. Different recipes of energy absorbing materials were tested and the resulting physico-mechanical properties, namely bulk density and flexural, compressive and impact strength, are listed in this article. Deformation curves were recorded during pressure loading of materials with macrofillers incorporated. Based on these curves, the rate and mode of energy absorption can be predicted. Most samples underwent the Split-Hopkinson pressure bar test which was the crucial method for the determination of impact energy absorption.