Experience of systematic experimental evaluation of modern high-tech concretes based on a set of criteria for their resistance to destruction

The long-term experience of theoretical consideration and experimental evaluation of concrete fracture resistance as structured systems is discussed. Reliable experimental evaluation of concrete fracture resistance indicators is of great scientific and practical importance for solving the problems both by materials scientists and technologists (synthesis and construction of concrete structures with controlled fracture resistance, development of technological production conditions on this basis) and design engineers (taking into account the special mechanisms of deformation and destruction of modern concrete, their behavior over time). To evaluate the concrete fracture resistance indicators, the methods of obtaining complete equilibrium deformation diagrams, laser holographic interferometry of the surface strain field, determination of the critical stress intensity coefficient at normal separation, and acoustic emission were used. From the standpoint of system-structural materials science, concrete is analyzed as an inhomogeneous dissipative system characterized in the categories of accumulation, dissipation, localization and concentration of stresses in it during the work of the material under mechanical and any other loads that determine the formation of stress and strain fields at various scale levels of the structure. Under the conditions of consistent application of experimental methods of full equilibrium diagrams of deformation, acoustic emission, laser holographic interferometry,and determination of the critical stress intensity coefficient at normal separation, obtaining of quantitative estimates for groups of traditional and high-tech concretes typical in structure in the range of their compressive strength from 30 to 150 MPa is provided. The role of each of the experimental methods considered in a reliable quantitative assessment of the deformation and destruction of modern concretes is shown.

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