The main features of the technology of continuous basalt fiber production at the «NPO Vulkan» (LLC, Perm, Russia) are given. As raw materials the study has been used CEM I 42,5 N (activity 45,1 MPa), natural sand with a fineness modulus of 2.3, gravel of dense gabbro-igneous rocks (size up to 20 mm), basalt fiber length of 6 mm and diameter 11 microns production "NPO Vulcan" (LLC, Perm, Russia). The results of determining the ultimate strength in compression and bending of fine-grained and heavy concrete without the addition of basalt fiber (control composition) and with the addition of fiber 0.1-0.9% by weight of cement are described. It is shown that the optimal limits of the introduction of fiber into the mixture of sand concrete can be considered 0.1-0.2% by weight of cement, which leads to an increase in compressive strength up to 70% and bending strength up to 35%. A further increase in the fiber content to 0.9% leads to a decrease in compressive strength to 27% compared to the control values.

Keywords: basalt fiber, sand concrete, heavy-weight concrete, fiber concrete, continuous fiber, optimization, disperse reinforcement