CRITICAL VOLTAGE INTENSITY COEFFICIENT AT NORMAL SEPARATION FOR NANOFIBRE CONCRETE

Abstract

The destruction of structures begins with the formation and propagation of cracks in the material. The growth of cracks, the laws of their initiation and methods of prevention are studied in the section of solid fracture mechanics. As a result of the research presented in this article, the parameters of the crack resistance of nanofibre concrete by the method of eccentric compression were obtained on samples of cubes with notches. The tests were carried out on different nano-concrete matrices and with different dispersed reinforcement: carbon nanotubes, basalt fiber, polymer, steel (3 types) and their combination. It was found that the greatest increase in the value of the stress intensity factor is observed with steel fiber up to 400%. Polymer fiber had the least effect on crack resistance up to 40%. The effect of dispersed reinforcement on the stress intensity factor at normal separation depends on the type of concrete matrix, on the material of the fiber fibers and their quantity.