AlfaBuild

REV RUS 1501-1501 0000-0001-8854-5408 Belarusian-Russian University Rzhevutskaya Valeria Andreevna valeriarzhevuckaya@gmail.com

Mira Ave, 43, 212000, Mogilev, Republic of Belarus

Shrinkage of expanded clay concrete: A review The review of the concrete mix components on the shrinkage strain of expanded clay concrete (claydite-concrete) has presented. An analytical review of various authors in the shrinkage strain investigation of claydite-concrete is given. The influence variants of coarse and fine aggregate, sand, cement, water-cement ratio, and additives on shrinkage deformations are considered. Besides, effective strategies to reduce shrinkage by immersing claydite in water for 24 hours before investigation and options for various additives are considered. Based on the analytical analysis, it was concluded if one or several components of the concrete mix change, the shrinkage deformation can be differed by 2 times and, respectively, affect the concrete strength characteristics, durability, and crack formation. Prospects for future research on Belarusian materials are described in general terms. 10.34910/ALF.15.1 69 expanded clay concrete lightweight-concrete claydite-concrete shrinkage modulus of elasticity cracking coarse aggregate claydite additives https://alfabuild.spbstu.ru/article/2020.15.1/ 1501-2.pdf

REV RUS 1502-1502 0000-0003-0564-9928 Azerbaijan SPU of Hydro technique and Melioration, Baku, Azerbaijan Lipin Andrey dorian.lipin@gmail.com

Baku, Azerbaijan

Surface telescopic water intake: A review The scope of use of surface telescopic water intake at various water sources had explored. Working conditions of the vertical telescopic water intake in reservoirs, were analyzed. The effectiveness of the use of this hydra technical structure in large and medium reservoirs has been established. The influence of all possible factors on the operation of vertical telescopic intake in the reservoir was studied. An analysis of the effective use of vertical telescopic water intake in a lake was conducted. All possible factors acting on the water intake in the lake were studied and the most optimal location of the hydraulic system was proposed. The working conditions of vertical telescopic water intake in rivers and mountain rivers were studied. The advantages and disadvantages of using vertical telescopic water intake in this type of reservoirs are established. The features of the vertical telescopic water intake in the channels were studied. 10.34910/ALF.15.2 69 water intake water supply rivers lakes reservoirs canals telescopic water intake https://alfabuild.spbstu.ru/article/2020.15.2/ 1502-3.pdf

REV RUS 1503-1503 0000-0002-2376-8501 Peter the Great St. Petersburg Polytechnic University, St. Petersburg, Russian Federation Khromova Daria Aleksandrovna hromova.da@edu.spbstu.ru

St. Petersburg, Russian Federation

Safety in Deep Offshore Oil and Gas Production and Environmental Safety The relevance of the topic of the article is due to the growing importance of deep offshore oil and gas production, ensuring the safety of personnel during field development, as well as the preservation of the environment. Currently sharply increased depth of water mark, at which the oil and gas. Features of installation and operation of the deep sea pipeline, underwater injection systems for wells located on the seabed prove that emergency cases are closely related to a deeper water level. Archival scientific sources and documents for the period from 2010 to 2019 were studied. A search and selection of relevant literature was carried out using effective selection criteria for sources. Peculiarities of installation and operation of the deep offshore pipeline have been identified, problems and safety of personnel in the conditions of deep offshore oil and gas production and environmental safety conditions have been identified. 10.34910/ALF.15.3 69 Petroleum Industry; Marine Environment; Deep Water; Uncontrolled Conditions; Drilling Rigs; Offshore Drilling; Offshore Oil Production; Shallow Water https://alfabuild.spbstu.ru/article/2020.15.3/ 1503-3.pdf

RAR RUS 1504-1504 AAX-2291-2020 57197842900 0000-0002-4629-5583 Research Institute of Building Physics of Russian Academy of Architecture and Construction Sciences, Russian Federation Zheldakov Dmitry Yurevich djeld@mail.ru

Moscow, Russian Federation

The Brick Material Durability in Brickwork Destruction of bricks in building’s enclosure brickworks in regions without negative temperature (e.g. Sienna, Italy) shows that frost resistance is not a determinant parameter when evaluating the durability of brick’s material. At the same time, the mechanism of brickwork destruction for different regions and periods is the same. Based on those field studies, a scientific hypothesis can be made that brick destruction in building enclosure’s brickwork derives from chemical corrosion. Based on this hypothesis, the purpose of scientific research was determined – to determine the durability of the material in time units. To achieve it and to validate the scientific hypothesis, the method of brick’s material degradation was developed. It consists of 3 stages: first non-chemical stage of material humidification; first chemical stage of alkalis’ formation from amorphous part of brick’s material; second chemical stage of material’s degradation caused by the interaction of alkalis with silicon and aluminum oxides. The possibility of a chemical reaction’s process was proven by thermodynamic calculations. To determine the kinetic characteristics of chemical stages of the degradation process, research methods of alkalis formation process by material humidification and brick material’s degradation were developed. Based on laboratory researches, kinetic characteristics of chemical reactions were obtained: dependency of reaction’s speed to the concentration of reagents and temperature of the process. Kinetic characteristics of degradation process with the application of material’s humidification speed parameter allowed calculation of brick material’s durability in time units. The results of 3 different brick materials were realistic. On the current development stage, it allows us to recommend this method to evaluate brick material’s durability instead of methods by frost resistance and strength. 10.34910/ALF.15.4 69 Brick Chemical corrosion Durability Frost resistance Brickwork https://alfabuild.spbstu.ru/article/2020.15.4/ 1504-3.pdf