Response of fine-grained fiber-reinforced concretes under dynamic compression
The article presents the results of tests of different types of fiber-reinforced concrete in comparison with concrete-matrix. The dynamic experiments were carried out using the split Hopkinson bar technique on samples of fine-grained concrete-matrix, as well as with the addition of steel and polypropylene fiber. The static tests of these materials were carried out using the Z100 Zwick-Roell testing machine. Diagrams of deformation and dependences of maximum stresses versus the stress rate are constructed. The obtained data were used to determine the values of the incubation failure time of the studied materials. The influence of the stress rate on the strength of the materials and the applicability of the structural-temporal approach for the prediction of this effect is shown.