Features of the fine-grained concrete physical and mechanical properties and obtaining a "τ-γ" deformation curve for it based on the author's theory

Fine-grained concrete has recently been increasingly used in practice for several reasons. The literature analysis shows that for the classes B15-B60 this type of concrete has lower values of strength characteristics and initial deformation modulus at a higher cement consumption compared to heavy-weight concrete. However, for high strength classes, fine-grained concrete has a higher compressive strength (for the class B100 - by 20.1%) than heavy-weight concrete. The model parameters' (geometric, physical and kinematic) calculation according to the author's theory of the anisotropic materials force resistance to compression by prof. B.S. Sokolov for heavy and fine-grained concrete of various classes - from B15 to B100. It has been established that the inclination angle of the shear sites α with increasing concrete class increases nonlinearly, and, starting from class B60, it tends to a certain constant value: for heavy-weight concrete - 73-750, and for fine-grained concrete - 67-710. For the first time on the basis of the theory, a "τ-γ" deformation curve for fine-grained concrete was obtained. It can be used in calculating bent reinforced concrete elements along an inclined section, in calculating the reinforcing bars' anchoring length in concrete, and also in solving other practical issues.