The monograph presents the results of experimental and theoretical studies of the behavior of wood and concrete of various structures under biaxial and triaxial compression. It contains a systematic classification of existing models for concrete that link three-axis nonlinear elastic stresses and deformations, as well as research and subsequent evaluation of some basic models from the point of view of their possible use in the framework of spatial load analysis using FEM. It is intended for scientific and engineering workers of research and design organizations.
The monograph considers a wide range of issues related to the determination of strength characteristics of concrete by non-destructive methods. The physical principles of the main methods of non-destructive testing of concrete in structures are stated, promising directions of improvement of non-destructive methods are considered. Much attention is paid to the development of ultrasonic methods of concrete testing. The extensive experimental material of laboratory tests and the results of field tests at construction sites, which are considered from the standpoint of the current standards and the introduced norms of the European Union, are presented. The results of long-term observation of deformations of the supporting frame of a high-rise building obtained using an automated monitoring system are presented. It is intended for engineering and technical workers of construction laboratories, designers, specialists engaged in the design and use of non-destructive testing of concrete, and will also be useful to students, undergraduates, graduate students and teachers of higher educational institutions dealing with quality control in construction.
Section I of the monograph is devoted to an urgent problem - forecasting the durability of port reinforced concrete structures, the destruction of which is associated with corrosion of steel reinforcement caused by chloride aggression and carbonation of concrete. The analysis of models for calculating the service life of structures and experimental data is carried out, the life cycles for the main degradation processes in concrete and reinforcement, the periods of initiation and propagation of corrosion are considered, the influence of environmental factors (temperature, humidity) and the quality of concrete (In/C, cement consumption, diffusion coefficient) on the kinetics of chloride penetration and the movement of the carbonation front is taken into account. Probabilistic models of basic variables are considered, the limiting states of port reinforced concrete structures for the durability of reinforced concrete structures based on the reliability coefficient for service life are formulated. Sections II and III describe modern methods of restoration and restoration of reinforced concrete port structures subjected to corrosion destruction using nanofibrobeton. The concept of multilevel reinforcement has been implemented. Methods of experimental fracture mechanics were used to evaluate the joint work of exploited concrete and reinforcement nanofibre concrete. It is intended for scientific and engineering staff of universities, research and design organizations.
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