ПІДВИЩЕННЯ СТІЙКОСТІ БУДІВЕЛЬНИХ ВИРОБІВ ПРИ МАЛОЦИКЛОВІЙ УТОМІ БЕТОНУ

Abstract

Structural adaptation of the material provides stability of initial level of properties of concrete under the influence of changing stress. This is, to a large extent, determined by changes the parameters of technological cracks and inner surfaces of partition as active elements of the structure, capable in a timely manner of responding to external influences. Material properties remain at the predetermined level as result of structure self-organization. Poly-structure of concretes implies mutual influence and interaction of the structural levels at all periods of their life cycle. There are new possibilities for the directed organization of the structure of concrete as a complex dynamic open system by changing the initial conditions for the structure formation of individual subsystems - the levels of structural heterogeneities. Variation of the compositions can serve as a factor of controlling the kinetics of the processes of organization of the structure at a certain level with reaching the level of the structure of the concrete and the product. The microstructure of concrete can be organized by internal, external and complex activation. The operating factor of macrostructure formation can be a change in the ratio of adhesion and cohesive bonding forces at the surface of partition between the matrix material and the fillers. Concretes with a structure formed by selective adhesion of the cement matrix to the fillers had the raised parameters of quality and were better adapted to low-cycle fatigue stress. Interference and interaction of the active elements of the structure is a factor of the safe functioning of building constructions. To increase the resistance of concretes can be due to the directional formation of interdependent structures. It allows you to obtain the specified sets of structural elements that ensure the preservation of the level of the product properties in complex operating conditions.