Fracture Toughness of Nanofiber-Reinforced Concrete on Normal Separation and In-Plane Shear

Tests were carried out on various nanoconcrete matrices and with different dispersed reinforcement fabric: carbon nanotubes, basalt fiber (polymer, 3 types of steel, and their combinations). It has been established that the value of the stress intensity factor KIIC in the case of normal separation increases most with steel fiber (up to 400%). Polymer fiber exerted the least effect on crack resistance - up to 40%. The influence of dispersed reinforcement on the stress intensity factor in the case of normal separation depends on the type of concrete matrix, on the material of fiber fabric, and on the quantity of the latter.