Abstract: There are reviewed in the study the questions of combined disperse reinforcement of fine-grained concretes with steel wave fiber and polypropylene fiber. There is a possibility to increase the effectiveness of composition astringent which is made by recrushing of portland cement with plasticizing additive "Polyplast premium" in the vibrating mill to the specific surface area 600 m/kg at the expense of control 2 of structure formation processes during the synthesis of cement matrix by use of nanodispersed powder with the specific surface area up to 160 m/kg which is extracted from hydrothermal sources of volcanic 2 regions. The injection of NDP in number of 0.01% of astringent mass precipitates the process of synthesis of new formations by binding of emissive CaO into the hydrosilicates calcion of different basicity during the alite aquation. Such optimization of the cement stone microstructure allows to get an astringent with the activity of 120 MPa. There are proposed the principles of optimization of fine-grained concretes structure: at nanolevel at the expense of use of composition astringent and nanodispersed powder, at microlevel, at the expense of high-density packaging of aggregate at macrolevel-at the expense of the injection of steel and polypropylene fiber. It allowed to develop a wide range of use of fine-grained fiber-reinforced concrete for the monolithic construction with breaking point up to 169.6 MPa by compression, frost-resistance F700 and high deformative characteristics.
S.V. Klyuev, A.V. Klyuev, T.A. Khezhev and Yu.V. Pukharenko, 2018. High-Strength Fine-Grained Fiber Concrete with Combined Reinforcement by Fiber. Journal of Engineering and Applied Sciences, 13: 6407-6412.