Improvement of Strength and Strain Characteristics of Lightweight Fiber Concrete by Electromagnetic Activation in a Vortex Layer Apparatus

Shcherban’, Evgenii M.; Stel’makh, Sergey A.; Beskopylny, Alexey; Mailyan, Levon R.; Meskhi, Besarion; Shuyskiy, Anatoly

doi:10.3390/app12010104

Cited by 16 publications

(8 citation statements)

References 41 publications

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“…In addition, the study used testing and auxiliary equipment as well as measurin instruments used earlier in [51,52,[61][62][63][64][65][66][67][68]. Compressive strength tests of specimens "were carried out in accordance with GOST 10180 Concretes.…”

Section: Experimental Test Methodsmentioning

confidence: 99%

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Theoretical and Experimental Substantiation of the Efficiency of Combined-Reinforced Glass Fiber Polymer Composite Concrete Elements in Bending

et al. 2022

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An essential problem of current construction engineering is the search for ways to obtain lightweight building structures with improved characteristics. The relevant way is the use of polymer composite reinforcement and concrete with high classes and prime characteristics. The purpose of this work is the theoretical and experimental substantiation of the effectiveness of combined-reinforced glass fiber polymer composite concrete (GFPCC) bending elements, and new recipe, technological and design solutions. We theoretically and experimentally substantiated the effectiveness of GFPCC bending elements from the point of view of three aspects: prescription, technological and constructive. An improvement in the structure and characteristics of glass fiber-reinforced concrete and GFPCC bending elements of a new type has been proven: the compressive strength of glass fiber-reinforced concrete has been increased up to 20%, and the efficiency of GFPCC bending elements is comparable to the concrete bending elements with steel reinforcement of class A1000 and higher. An improvement in the performance of the design due to the synergistic effect of fiber reinforcement of bending elements in combination with polymer composite reinforcement with rods was revealed. The synergistic effect with optimal recipe and technological parameters is due to the combined effect of dispersed fiber, which strengthens concrete at the micro level, and polymer composite reinforcement, which significantly increases the bearing capacity of the element at the macro level. Analytical dependences of the type of functions of the characteristics of bent concrete structures on the arguments—the parameters of the combined reinforcement with fiber and polymer composite reinforcement—are proposed. The synergistic effect of such a development is described, a new controlled significant coefficient of synergistic efficiency of combined reinforcement is proposed. From an economic point of view, the cost of the developed elements has been reduced and is economically more profitable (up to 300%).

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Section: Experimental Test Methodsmentioning

confidence: 99%

“…In addition, the study used testing and auxiliary equipment as well as measuring instruments used earlier in [51,52,[61][62][63][64][65][66][67][68].…”

Section: Experimental Test Methodsmentioning

confidence: 99%

Theoretical and Experimental Substantiation of the Efficiency of Combined-Reinforced Glass Fiber Polymer Composite Concrete Elements in Bending

et al. 2022

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“…For the manufacturing and further testing of samples in this study, the following equipment was used: Technological equipment—laboratory concrete mixer BL-10 (ZZBO LLC, Zlatoust, Russia); Testing equipment—hydraulic press IP-1000 (NPK TEHMASH LLC, Neftekamsk, Russia), R-50 tensile testing machine (IMash LLC, Armavir, Russia); Measuring instruments [ 58 , 59 , 60 , 61 , 62 , 63 , 64 ]. …”

Section: Methodsmentioning

confidence: 99%

A Study on the Cement Gel Formation Process during the Creation of Nanomodified High-Performance Concrete Based on Nanosilica

Beskopylny

Stel’makh

Shcherban’

et al. 2022

Gels

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One of the most science-intensive and developing areas is nano-modified concrete. Its characteristics of high-strength, high density, and improved structure, which is not only important at the stage of monitoring their performance, but also at the manufacturing stage, characterize high-performance concrete. The aim of this study is to obtain new theoretical knowledge and experimental-applied dependencies arising from the “composition–microstructure–properties” ratio of high-strength concretes with a nano-modifying additive of the most effective type. The methods of laser granulometry and electron microscopy are applied. The existing concepts from the point of view of theory and practice about the processes of cement gel formation during the creation of nano-modified high-strength concretes with nano-modifying additives are developed. The most rational mode of the nano-modification of high-strength concretes is substantiated as follows: microsilica ground to nanosilica within 12 h. A complex nano-modifier containing nanosilica, superplasticizer, hyperplasticizer, and sodium sulfate was developed. The most effective combination of the four considered factors are: the content of nanosilica is 4% by weight of cement; the content of the superplasticizer additive is 1.4% by weight of cement; the content of the hyperplasticizer additive is 3% by weight of cement; and the water–cement ratio—0.33. The maximum difference of the strength characteristics in comparison with other combinations ranged from 45% to 57%.

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“…The study used: Technological equipment—installation for the production of foam concrete and aerated concrete GBS-250 manufactured by METEM (Perm, Russia); ball planetary mill “Activator-4M” (LLC “Plant of Chemical Engineering”, Novosibirsk, Russia); Testing equipment—hydraulic press MIP-25 (LLC NPP INTERPRIBOR, Chelyabinsk, Russia); Measuring instruments—metal measuring ruler 500 mm (JSC “Stavropol Tool Plant”, Stavropol, Russia); laboratory scales HT-5000 (NPP Gosmetr, St. Petersburg, Russia); caliper ShTs-I-250-0.05 (LLC NPP Chelyabinsk Tool Plant, Chelyabinsk, Russia); thermal conductivity meter ITP-MG4 (OOO SKB Stroypribor, Chelyabinsk, Russia) ( Figure 2 b); viscometer ZM-1001 (Priborelectro LLC, Moscow, Russia); plastometer K-2ZhV (OOO NPP Tochpribor, Rostov-on-Don, Russia) [ 39 , 40 , 41 , 42 , 43 ]. …”

Section: Methodsmentioning

confidence: 99%

“…Measuring instruments—metal measuring ruler 500 mm (JSC “Stavropol Tool Plant”, Stavropol, Russia); laboratory scales HT-5000 (NPP Gosmetr, St. Petersburg, Russia); caliper ShTs-I-250-0.05 (LLC NPP Chelyabinsk Tool Plant, Chelyabinsk, Russia); thermal conductivity meter ITP-MG4 (OOO SKB Stroypribor, Chelyabinsk, Russia) ( Figure 2 b); viscometer ZM-1001 (Priborelectro LLC, Moscow, Russia); plastometer K-2ZhV (OOO NPP Tochpribor, Rostov-on-Don, Russia) [ 39 , 40 , 41 , 42 , 43 ].…”

Section: Methodsmentioning

confidence: 99%

Mathematical Modeling and Experimental Substantiation of the Gas Release Process in the Production of Non-Autoclaved Aerated Concrete

et al. 2022

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The widespread use of aerated concrete in construction has led to the emergence of many types and compositions. However, additional research should fill theoretical gaps in the phenomenon of gas release during the formation of the structure of aerated concrete. Based on theoretical analysis and experimental studies, the article proposes a mathematical model of the swelling process based on the physicochemical laws of convection and molecular diffusion of hydrogen from a mixture and the conditions of swelling, precipitation, and stabilization of the mixture. An improved method for the manufacture of aerated concrete is proposed, which consists of introducing cement pre-hydrated for 20–30 min into the composition of the aerated concrete mixture and providing improved gas-holding capacity and increased swelling of the mixture, reducing the average density of aerated concrete up to 29% and improving heat-shielding properties up to 31%. At the same time, the small dynamics of a decrease in the strength properties of aerated concrete were observed, which is confirmed by an increased structural quality factor (CSQ) of up to 13%. As a result, aerated concrete has been obtained that meets the requirements of environmental friendliness and has improved mechanical and physical characteristics. Economic efficiency is to reduce the cost of production of aerated concrete and construction in general by about 15%.

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Improvement of Strength and Strain Characteristics of Lightweight Fiber Concrete by Electromagnetic Activation in a Vortex Layer Apparatus

Cited by 16 publications

References 41 publications

Theoretical and Experimental Substantiation of the Efficiency of Combined-Reinforced Glass Fiber Polymer Composite Concrete Elements in Bending

Theoretical and Experimental Substantiation of the Efficiency of Combined-Reinforced Glass Fiber Polymer Composite Concrete Elements in Bending

A Study on the Cement Gel Formation Process during the Creation of Nanomodified High-Performance Concrete Based on Nanosilica

Mathematical Modeling and Experimental Substantiation of the Gas Release Process in the Production of Non-Autoclaved Aerated Concrete

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