The article summarizes the results of the survey of the building of the House of Soviets - a unique long-term construction with the start of building in 1970. The limited operable condition of the building with accident elements is justified. The causes of defects and damages are due to the low quality of construction and installation work, lack of conservation, long-term climatic effects of the marine climate on building structures; vandal actions due to the lack of security of the facility; damage to structures due to attempts to reconstruct the facility by intermediate owners in violation of building standards.

Original paper: Synthesized intervention method to prolong service life of reinforced concrete structures: ICCP-SS. Structural Concrete. 2021. Vol. 22, pp. 590–592. https://doi.org/10.1002/suco.202000261

The theoretical substantiation of the change in the nature of concrete destruction of the contact layer in the anchoring zone depending on the geometric parameters of the periodic profile of the reinforcement in accordance with the basic provisions of the general theory of adhesion and anchoring of the reinforcement of the periodic profile in concrete (GTA) is presented. The analysis of the results of experimental studies confirming the change in the nature and sequence of concrete destruction in the anchoring zone when changing the pitch of the transverse ribs of the circular periodic profile of the form 1f according to GOST 34028–2016 “Reinforcing bars for reinforced concrete structures. Technical conditions” is made. The possibility of increasing the seismic resistance of reinforced concrete structures according to the GTA is proved when changing the geometric dimensions of the profile and the sequence of concrete destruction in the contact layer. The comparison of the properties of reinforcement with periodic profiles according to GOST 34028–2016 and reinforcement with a profile corresponding to the basic provisions of the GTA and the possibility of reducing the metal consumption of reinforced concrete due to including the transverse ribs of the profile in the stretching work is given.

The features of the behavior of concrete slabs with glass composite reinforcement in a fire and their differences from reinforced concrete structures identified on the basis of fire tests are presented. The article substantiates the inapplicability of standard criteria for achieving the fire resistance limits of reinforced concrete structures for the experimental assessment of the fire resistance of concrete structures with glass composite reinforcement.

The article presents an engineering methodology for calculating the slab-column joints, coupled with different strength grades of concrete in slab and column. The accuracy of the proposed formulas was assessed in comparison with experimental data of other authors, as well as with the results of numerical modeling. Evaluation showed satisfactory accuracy of the proposed methodology.

The prerequisites for the optimal design of granulometric compositions of building mixes for the production of pressed concrete on a cement bond, based on the regularities of the formation of polydisperse structures, are described. An experimental method for determining the optimal granulometry of raw mixtures with the most dense packing of grains, providing the best compaction parameters of mixtures when hyperpressing, is presented. The influence of the moisture content of the raw mixture on the packaging of its particles and bulk density, as well as the strength of the finished material, taking into account the action of capillary coupling in dispersed systems, is shown.

The definition of soil-concrete used for the manufacture of foundation and road slabs in factory conditions is given. The characteristics and properties of the applied soils are considered. The technological scheme for the manufacture of the soil-concrete products is presented. Experimental compositions of soil-concrete of various grades are indicated. The technology of manufacturing products from soil-concrete has been tested in the factory. The slabs obtained by two-stage vibration under loading have stable strength characteristics, the required water and frost resistance to ensure their long service life.

A review of foreign and domestic regulatory documents on the application of the acoustic emission (AE) method in construction has been performed. An analysis of promising developments and research is presented, as well as proposals are formulated for conducting research and development works on the use of AE method in construction in order to develop new topics for standards on AE method, including unique ones that have no analogues abroad. Proposals for updating the base of standards for AE method and creating new documents in this area have been developed.

The article describes the main results of the research work (R & D) carried out at NIIZHB named after A. A. Gvozdev, concerning the research of the operation of plug-type connections for precast reinforced concrete structures of large-panel buildings. The aim of the research was to obtain designed and theoretical data on the operation of plug-type joints in large-panel structural systems for improving the design methods of precast concrete structures. Based on the results of designed and theoretical researches and their analysis in the course of R&D, recommendations for assessing the rigidity, strength and design of plug joints in large-panel structural systems have been developed. Also developed proposals for the design of plug joints in large-panel structural systems.

A detailed survey conducted on three structures is presented, which included a study of the temperature regime of concrete in the zone of variable water level; sampling of concrete from various sections of structures in the zone of variable level for further laboratory studies; determination of the mechanical and physical properties of concrete directly in the structures. The physical and mechanical properties of concrete: strength, frost resistance, water-tightness, water absorption, porosity, material composition of concrete were determined by standard methods. Chemical analysis of materials was carried out using standard and non-standard methods applied in similar studies to determine the aggressiveness of seawater to concrete. The penetration depth of chloride ions was determined by the material composition and additionally determined using the method of changing the color of concrete.

The III International Construction Forum and the 100⁺ TechnoBuild Exhibition, which took place in Yekaterinburg on October 5–7, 2021, gathered a record number of speakers – more than 500 experts spoke at 120 sessions. The magazines «Housing Construction» and «Construction Materials» acted as information partners of the event. The participants of 100⁺ Tekhnobuild discussed trends and prospects in the field of construction rationing, design, pricing, environmental construction, urban development models, and the experience of foreign companies. 225 companies presented materials and technologies at the 100⁺ TechnoBuild exhibition.