Sydor N. High strength concretes with high impact resistance for industrial floors

The dissertation is devoted to solving the problem of obtaining of high-strength concretes with high impact resistance for industrial floors by systemic modification of Portland cement with polydisperse mineral components in combination with highly effective polycarboxylate superplasticizers to improve their micro- and mesostructure, as well as reinforcement with dispersed polypropylene fibers, which provides three-dimensional strengthening of the structure to control the process of cracking and accumulation of energy of dynamic action. Complex modification and disperse reinforcement with polypropylene fiber provides obtaining of high strength concrete, which characterized by compressive strength of 87.1–96.8 MPa, flexural strength – 9.8–11.2 MPa, indicator of the specific consumption of Portland cement per unit of strength - 4.0–4.5 kg/MPa, specific strength fcm2/fcm28 – 0.50–0.51. The impact strength of the developed high-strength fiber-reinforced concretes in terms of specific energy at the appearance of the first crack is 33.4–44.1 J/cm3 and 61.7–80.3 J/cm3 at complete failure.