The processes of controlled hardening of nanomineral gypsum binders and the formation of microstructure that allow obtaining gypsum concrete with specified technological characteristics are analyzed. Innovative approaches to the regulation of strength and water resistance of gypsum nanobinders, the main directions of increasing their durability in concretes and mortars, building constructions and products are considered. Controlled hardening nanogypsum binders is a promising 3-D additive technology.The mechanism of hardening of gypsum nanocomposites based on calcium sulfate dihydrate and semihydrate is proposed. The kinetics of the process of hydration and setting of nanobinders depending on the content of the components is studied. The increase in strength in the process of hardening of pressed gypsum nanobinders is determined by the content of dihydrate and is accompanied by an increase in the size of needle and plate microcrystals with a thickness of less than 100 nm.Keywords: gypsum nanobinder, hardening, structure formation, semi-dry pressing, water resistance of gypsum concrete.For citation: Khalikov R.M., Sinitsina E.A., Silantyeva E.I., Pudovkin A.N., Nedoseko I.V. Modifying intensification of the hardening of extruded construction gypsum nanocomposites. Nanotehnologii v stroitel'stve Machine-readable information on CC-licenses (HTML-code) in metadata of the paper Nanotechnologies in Construction:A Scientific Internet-Journal Нанотехнологии в строительстве: научный Интернет-журнал 2019; 11 (5): 549-560 http://nanobuild.ru info@nanobuild.ru
АннотацияПредставлена оценка взаимодействия потоков излучения в камере сгорания судовогодизеля.Показано,чтоприанализетепловогосостояниядеталей камеры сгорания эффективными потоками излучения можно пренебречь.Ключевые слова: дизельный двигатель, камера сгорания, потоки излучения Abstract Estimationofinteractionofradiativeheatfluxesinmarinedieselenginecombustion chamberisgiveninthisarticle.Itisshownthatwhileanalyzingthermalconditionsofdetails ofcombustion chamber by effectiveradiation heat fluxes shout notbetaken into account.
Introduction. Repair of pipelines under pressure of pumped media by means of welding is relevant to reduce the complexity of work. However, it may reduce the safety of work. To solve this issue, the authors consider applying the technological processes of machine welding with controlled drop transfer.Aim. To determine the main parameters of technological processes of machine welding with controlled drop transfer, affecting the safety of welding.Materials and methods. The authors developed a theoretical model for calculating the working thickness of a pipeline wall under pressure which they used for calculating the strength during welding. The dependence of the pipeline wall thickness at the edge of the penetrated hole on the internal pressure was also used in the calculations.Results. It was found that machine welding with controlled transfer of metal drops allows the wall penetration depth to be regulated by changing the welding variables. This significantly increases the safety of welding on pipelines under pressure of pumped media, compared to other types of welding. The developed welding processes ensure the safety of welding operations by means of a smooth and accurate control of the wall penetration depth. This is achieved by the correct selection of the background and peak current, control of the drop transfer process by arc voltage, control of the amount of weld metal and the heating temperature of welded structures.Conclusion. Recently, a number of repair technologies have been developed to improve the quality of welds in the construction and repair of trunk pipelines. The highly significant results of research on the development of machine welding technology with controlled drop transfer allow this technology to be recommended as an effective way to improve the safety of welding operations on pipelines under pressure of pumped media.
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