Prospects of the use basaltic fibers concretes to fortification building

Abstract

The main task of manufacturing protective fortifications building is the use of modern concretes, withstand significant shock loads. However, one of the negative factors during the shelling of these structures with artillery and small-arms is the wounding of personnel by not only bullets and fragments, but also in fragments of excavated concrete. For the removal of this problem use the modified concretes that is reinforced by fibres and fibers of different nature.The purpose of the study is to compare the physical and mechanical properties of concrete, reinforced with dispersed fibers based on basalt, steel and polypropylene fibers, to study their ability to grip with a cement matrix.It was established that the introduction of fiber filler into concrete gives a three-dimensional strength, increases the tensile strength and curvature. The increase in the strength of the concrete mixture on compression, on tensile bending depends on an increase in the diameter and volume of fibers; when the diameter and volume of fibers increase, and the rigidity of the concrete mixture, which adversely affects its compaction.The most effective reinforcing fibrous fillers were basalt fibers, which are characterized by high durability. Strength of compression, bending and tension of fiber concrete increases from 84.6 to 121.8; from 8.6 to 14.8 and from 4.2 to 8.6 MPa. However, at the same time, the rigidity of the concrete mixture increases, which negatively affects its consolidation. The optimum content of basalt fiber is from 0.5 to 1.0% of the weight of the cement.Taking into account advantages of basalt fiber over steel and polypropylene fibers, the use of basalt fibrous concrete is promising for the construction of fortification building.