Tasks of Building Materials from the Viewpoint of Control Theory

2017 ◽  
Vol 737 ◽  
pp. 578-582 ◽  
Author(s):  
Irina Garkina ◽  
Alexander Danilov

From the viewpoint of control theory is given the synthesis of building materials. A control of structure and properties of the material is carried by changing the relevant technological parameters. Material is regarded as an object of control in mathematical modeling. The model is presented as a solution to the Cauchy problem for an ordinary differential equation fourth-order. The synthesis is based on parametric identification of mathematical models. The parameters are typical points of the kinetic processes of the formation of physical and mechanical characteristics of the material. Among them: roots of the characteristic polynomial; inflection points; the extreme points, etc. Applications of this approach to the synthesis of building materials for special purposes are given.

2019 ◽  
Vol 974 ◽  
pp. 14-19
Author(s):  
V.B. Babaev ◽  
Natalia I. Alfimova ◽  
Victoria V. Nelubova ◽  
L.N. Botsman

The development of modern construction technologies requires the development of efficient building materials with a unique property set and the improvement of existing ones. Fiber-reinforced concrete is one of the types of effective composites that meets the specified requirements, ensuring the structures operation reliability. The difficulty of achieving its maximum physical and mechanical characteristics is due to the complexity of the fiber equal distribution in the concrete matrix. Studies aimed at the optimization of the formulation and technological manufacture parameters of fiber-reinforced fine concrete, have revealed that from the perspective of obtaining products with optimal physical and mechanical characteristics, it is most feasible to introduce the agglutinant sand (cement + sand) of pre-prepared suspension from fibers, water of mixing and naphthalene formaldehyde plasticizer. Optimal dosages of input products were also revealed (basalt fiber, cement, plasticizer), which made it possible to create mixes of fine concrete and products based on it with class B25-B60 for compressive strength and Btb2,8-Btb6,0 for bending, frost resistance not less than F300.


Author(s):  

Для регулирования вариатропной структуры центрифугированных изделий авторы данной статьи совместили процесс центрифугирования с вибрированием. Во время эксперимента вибрации формы обеспечивались за счет надетых на валы установки хомутов. Представлена авторская экспериментальная установка для создания виброцентрифугированных образцов кольцевого сечения с вариатропной структурой, а также способ их изготовления. Выделены технологические параметры вибрирования, которые оказывали наиболее значимое влияние на характеристики виброцентрифугированного бетона, конструкций и изделий из него. В опытах варьировались высота технологических выступов хомутов и шаг между ними. Исследовалось влияние этих факторов на физико-механические характеристики бетона: плотность; кубиковая прочность на сжатие; призменная прочность на сжатие; прочность на растяжение при изгибе; прочность на осевое растяжение. Приведен анализ результатов экспериментальных исследований и получены следующие физико-механические характеристики виброцентрифугированных бетонов, изготовленных с использованием хомутов: лучшие – с высотой технологических выступов 5 мм и шагом между ними 30 мм, самый низкий показатель – соответственно 2,5 мм при любом шаге. Ключевые слова: виброцентрифугированный бетон, физико-механические характеристики, прочность при сжатии, плотность, бетонная смесь, центрифугирование, прочность при изгибе To regulate the variatropic structure of centrifuged products, the authors of this article combined the process of centrifugation with vibration. During the experiment, vibrations of the mold were provided with clamps set on the shafts of the installation. The author's experimental setup for creating vibrocentrifuged samples of annular cross-section with a variatropic structure, as well as a method for their manufacture is presented. The technological parameters of vibration, which had the most significant effect on the characteristics of vibrocentrifuged concrete, structures and products made of it, were identified. In the experiments, the height of the technological protrusions of the clamps and the pitch between them were varied. The influence of these factors on the physical and mechanical characteristics of concrete was investigated: density; cube compressive strength; prismatic compressive strength; bending tensile strength; axial tensile strength. Analysis of the results of experimental studies is given and the following physical and mechanical characteristics of vibrocentrifuged concretes made using clamps have been obtained: the best ones with a height of technological protrusions of 5 mm and a step between them of 30 mm, the lowest indicator is, respectively, 2.5 mm at any step. Keywords: vibrocentrifuged concrete, physical and mechanical characteristics, compressive strength, density, concrete mix, centrifugation, flexural strength


2021 ◽  
Vol 887 ◽  
pp. 487-492
Author(s):  
A.A. Yusupova ◽  
L.R. Baraeva ◽  
A.A. Bobrishev

A technology has been developed for the processing recycling of waste - sulfuric cake into building materials with high physical and mechanical characteristics. Sulfur activator (zinc chloride) contributed to the chemical bonding of the components.


2021 ◽  
pp. 58-62
Author(s):  
Artem Runts ◽  
Sergei Ruchin ◽  
Yurii Zhidik ◽  
Alena Yurjeva ◽  
Mariya Polosukhina

The paper presents the results of testing the technology of deposition of diamond-like carbon films on the surface of stainless steel substrates at different process parameters, a quantitative assessment of the sp3 bond content and the physical and mechanical characteristics of the coatings obtained, a conclusion about the influence of the deposition process technological parameters on these characteristics is formulated.


2017 ◽  
Vol 26 (4) ◽  
pp. 343-360 ◽  
Author(s):  
Jiří Witzany ◽  
Radek Zigler ◽  
Tomáš Čejka ◽  
Pavel Pospíšil ◽  
Milan Holický ◽  
...  

2014 ◽  
Vol 496-500 ◽  
pp. 2383-2386 ◽  
Author(s):  
Natalia Viktorovna Pavlenko ◽  
Valeria Valerievna Strokova ◽  
Alla Vasilievna Cherevatova ◽  
Daria Dmitrievna Netsvet ◽  
Evgeniy Vladimirovich Miroshnikov

The article is devoted to the characteristics of foam concrete with the application of nanostructured binder (NB) on the basis is amorphous aluminosilicate rocks. The optimal technological parameters of the production of nanostructured perlite binder (NPB) were stated. The selection of foam generating agents was accomplished and mechanisms of formation of cellular composites on the basis of NPB were studied. Physical and mechanical characteristics of the obtained material were determined.


2019 ◽  
Vol 105 ◽  
pp. 01039 ◽  
Author(s):  
Natalya Gilyazidinova ◽  
Evgeniy Shabanov ◽  
Xuesheng Liu

The paper considers the possibility of using slag concrete in underground construction. Technological parameters for production of slag concrete with the set properties are defined. The influence of the composition of slag concrete used in the conditions of mine construction on the change of physical and mechanical characteristics, durability and stability is determined. The limits of technological parameters of slag concrete preparation are established. The possibilities of combined use of blast-furnace slags and clinkers for concrete in mine construction are substantiated. The chemical composition of blast furnace slag and the possibility of its application in the composition of concrete is described, the interaction of an aggregate - Portland cement with blast furnace slag is studied. The technique for conducting experiments to determine the rate of strength gain of different types of concrete is described. The rate of strength gains of heavy concrete and the rate of strength gain of slag concrete with additives and without additives have been compared. The possibility of application of this slag concrete in the process of concreting with the use of sliding formwork has been studied.


2010 ◽  
Vol 2 (3) ◽  
pp. 79-85 ◽  
Author(s):  
Jiri Witzany ◽  
Tomas Cejka ◽  
Radek Zigler

Experimental and laboratory research into residual physical and mechanical characteristics of historical masonry structures (GAČR 2008; Witzany 2008), in particular the determination of residual strength and modulus of elasticity in compression, included research oriented towards the effect of moisture and porosity on the respective characteristics of masonry units – bricks, sandstone and arenaceous marl. Partial results published in (Witzany et al. 2008) and in this paper testify to the need for further research into the effects of porosity, moisture and chemism on the development of characteristics of building materials applied on historical structures.


2021 ◽  
Vol 18 (1) ◽  
pp. 120-134
Author(s):  
V. S. Lesovik ◽  
A. А. Sheremet ◽  
I. L. Chulkova ◽  
A. E. Zhuravleva

Introduction. Methodological approaches and validation of the emergence of a new transdisciplinary area -geonics, which is considered as the art of applying knowledge of the inorganic world, are presented.Materials and methods. The concept of technogenic metasomatism as a stage in the evolution of building materials, characterized by the adaptation of the composite to changing conditions is formulated. The Law of affinity of structures, which consists in the selection of raw materials for a composite with similar physical and mechanical characteristics, is described.Results. The examples of non-traditional raw materials use in the areas of construction materials science (intelligent composites, restoration mixtures) and architecture (the building of the Belarusian Potash Company in Belarus, the 'Reflection of the mineral’ building in Japan, the design concept of the monument to the Kursk magnetic anomaly) are presented.Discussion and conclusions. It is proved that the development of a transdisciplinary approach to geonics will improve the comfort of human stay in the environment.


2020 ◽  
pp. 22-26
Author(s):  
YURY G. IVANOV ◽  
◽  
YELENA V. MASHOSHINA ◽  
LYUDMILA N. VERLIKOVA ◽  
DARIA G. GELETIY ◽  
...  

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