Bulletin of Belgorod State Technological University named after. V. G. Shukhov
The paper presents a one-stage method of development results to obtaining effective structural an... more The paper presents a one-stage method of development results to obtaining effective structural and thermal insulation products based on cellular concrete with variatropic structure and the study of their properties. In addition, the paper presents the study's results on determining the influence of initial components quantitative ratio of the foam-aerated concrete mixture and technological regimes. For this purpose, a model system [Ca(OH)2;Al;H2O;NaF] has been created. The effect of the foam-aerated concrete mixture's form filling ratio (1.0÷0.7) and the perforation index of the form walls on the formation and properties of cellular concrete with a variatropic structure is studied. Influence of variatropic structure of cellular concretes on strength characteristics of products based on them is studied. It is confirmed that products based on cellular concrete with variable density from the periphery have sufficiently good thermal insulation properties due to the low density i...
IOP Conference Series: Materials Science and Engineering, 2021
The paper presents mathematical modeling of additives and water’s effect on foam concrete’s compr... more The paper presents mathematical modeling of additives and water’s effect on foam concrete’s compressive and flexural strength at 28 days of normal hardening. The requirements of GOST 10180-2012 determined the compressive and flexural strength of foam concrete. The initial composition of the foam concrete mix was calculated using the absolute volume method. Results received first-order regression equations. The compressive strength and flexural strength of foam concrete depended on the relations from x1(WOPC+BFS)tox3(SF90OPC) and the image surface expression and objective function for the regression equations. The optimal value obtained: compressive strength = 8.075 MPa and flexural strength 1.087 MPa.
This study uses the mathematical method of two-factors rotatable central compositional planning t... more This study uses the mathematical method of two-factors rotatable central compositional planning to predict and simulate the effect of the ratio of water-cement (N/X) and sand - binder (C/CKD) as the input parameters on the objective functions of the spreading flow of concrete mixtures and the compressive strength of fine-grained high-performence concrete (FGHPC) at 28 days. Results of the study showed that, from the material source in Vietnam, it is possible to FGHPC with a flow of 18.5 cm in the mini cone, its compressive and flexural strengths at the age of 28 days are 68.5 MPa and 6.13 MPa, respectively. Furthermore, from the obtained objective functions, it has been shown that the both two-input parameters have a significant influence on the values of the experimental models. Particularly, using Matlab software is showed the expression surface, the contour line of the experimental models, and determined the maximum value of compressive strength of FGHPC at this age of 69.84 MPa ...
Bulletin of Belgorod State Technological University named after. V. G. Shukhov, Nov 20, 2019
Blast furnace slag is a waste of metallurgical industry which can be used in production technolog... more Blast furnace slag is a waste of metallurgical industry which can be used in production technology of concretes and mortars. The expedient use of blast furnace slag as a component for new building materials will improve the environmental situation and increase the economic efficiency of production. The authors reaserch blast furnace slag processing technology of factories "Hoa Phat" (Vietnam) and "Thai Nguyen" (Vietnam) to produce mineral additives. As a result of the conducted researches the chemical and mineralogical composition of slags are received, their physical and mechanical characteristics are considered and defined: specific surface area, density, water demand, and others. According to standard of Vietnam and Russia, slag activity index is calculated when considering the possibility of using blast furnace slags to replace part of the binder. The relationship between the strength of the cement-sand mortar and density affected by the binder are reveald (where; binder = Portland cement + Granulated blast furnace slag). Comparison chart of slag activity index IR (%) has been shown. The paper uses the Vietnamese standard TCVN 11586: 2016 to analyze the possibility of using blast furnace slag (Vietnam) in the technology of concrete and mortar construction.
Journal of Physics: Conference Series, Dec 1, 2019
The present study evaluated the combined effects of organic-mineral additive based on a superplas... more The present study evaluated the combined effects of organic-mineral additive based on a superplasticizer SR 5000F and the active mineral additive Fly Ash, Blast Furnace Slag and Silica Fume SF-90 on properties of foam concrete (FC). The calculation of mixture proportions of FC is applied in accordance with the absolute volume method. Besides, the compressive strength and flexural strength of foam concrete are determined by Russian standard GOST 10180-2012. The results from experiments show that flexural and compressive strength of the FC obtained respectively, from 3.25 to 5.08 MPa and from 13.91 to 26.87 MPa. The use of an organic-mineral additive in the mixture was led to increasing the compressive and flexural strength of foam concrete at the age of 28 days, respectively, from 8% to 93% and from 6% to 56%. The relationship between compressive strength and curing age, compressive and flexural strengths of the FC were also determined in this investigation. The results of this study demonstrated that the use of appropriate amounts of fly ash and blast furnace slag to partially replace natural sand could produce eco-friendly foam concrete, which has many positive environmental impacts.
Foam concrete has been widely used in the High-Rise buildings for both structural, non-structural... more Foam concrete has been widely used in the High-Rise buildings for both structural, non-structural purposes and other applications. This paper discusses the development of foam concrete containing various the water-cement ratios from 0.4 to 0.8 was prepared from ordinary Portland cement SEM I 42.5 N and foaming agent of EABASSOC. Effects of the water-cement ratio on the porosity structure of foam concrete, as well as dry density and strength of the tested foam concrete, were discussed. Moreover, quantitatively simulation of the relationship between compressive strength at age 28 days and dry density of foam concrete is determined through experimental results for predicting the properties of foam concrete from the knowledge of its mixture proportions. Results of this study showed that the water-cement ratio can influence the porosity in the microstructure of foam concrete, while the optimal water-cement ratios of the foam concrete prepared with design density of 400, 500, 600, 700, and 800 kg/m 3 are also obtained of 0.58, 0.54, 0.56, 0.55, and 0.53, respectively.
Nowadays various light concrete types have many advantages as compared to heavyweight concrete (t... more Nowadays various light concrete types have many advantages as compared to heavyweight concrete (total structures mass decrease, increased thermophysical properties, less material consumption). Various industrial wastes use such as fly ashes, slag and bottom ash was suggested to enhance the light concretes effectiveness. This is greatly important for a green light concrete production since it is very important to obtain new types of environmentally friendly materials using wastes. The article substantiates the light concrete use and creation with organo-mineral additives based on industrial waste, analysis of the second-order mathematical model describing the bottom ash (BA) amount effect of Vung Ang TPP and expandable polystyrene spheres (EPS) on the light concrete density and compressive strength at the age of 28 days of normal hardening is done. In this work, the BA and EPS amounts varied from 14.5 to 45.5%, respectively, of the cement weight and from 24.5 to 55.5% of the concrete...
The benefits of using waste materials as a partial replacement for cement in high performance con... more The benefits of using waste materials as a partial replacement for cement in high performance concrete are also discussed. This paper presents the combined effects of bottom ash TPP “Vung Ang” and expanded polystyrene aggregate on different the properties of light-weight concrete. Twenty different concrete mixtures with a water to cement ratio of 0.4 and superplasticizer to cement ratio of 0.015 were used. On the one hand, the EPS was partially replaced with (0 ÷ 40)% by volume of concrete mixture. On the other hand, the fine aggregate was replaced with (0 ÷ 30)% by mass of BA TPP “Vung Ang”. The engineering properties, including workability, density and compressive strength of light-weight concrete were investigated at different curing times. The level of decrease in the strength depends upon the replacement level of EPS and BA. Specifically, the concrete containing 40% EPS and 30% BA at 28 days of age decrease in average density and strength were 43.2% and 26.4%, respectively, in ...
Lightweight aerated concrete (LAC) is produced by making LAC involves the addition of a gas-formi... more Lightweight aerated concrete (LAC) is produced by making LAC involves the addition of a gas-forming admixture like aluminium powder (AP) to a wet mortar mixture. In concrete during curing, AP will react with the calcium hydroxide in the mixture to form hydrogen. The amount of gas-forming is dependent on the mechanical properties requirements. The aim of the current work was to investigate the properties of aerated concrete (AC) containing 30% fly ash and various AP content, including dry density, porosity and modulus of elasticity, as well as strengths of test specimens. The results of this study showed that when AP content increased, the density of AC decreased, but its porosity increased. Whereas an increase in the amount of AP caused a decrease in both the compressive strength, tensile strength and the modulus of elasticity of ACspecimens. The investigation of newly modified AC through combination of local by-product in Vietnam would decrease the content of Portland cement was used and as well as reduce the amounts of ash and slag TPP as well as industrial waste thrown at a landfill. Therefore, assisting the thermoelectric power plants to be more environmentally friendly in the future.
Bulletin of Belgorod State Technological University named after. V. G. Shukhov
The paper presents a one-stage method of development results to obtaining effective structural an... more The paper presents a one-stage method of development results to obtaining effective structural and thermal insulation products based on cellular concrete with variatropic structure and the study of their properties. In addition, the paper presents the study's results on determining the influence of initial components quantitative ratio of the foam-aerated concrete mixture and technological regimes. For this purpose, a model system [Ca(OH)2;Al;H2O;NaF] has been created. The effect of the foam-aerated concrete mixture's form filling ratio (1.0÷0.7) and the perforation index of the form walls on the formation and properties of cellular concrete with a variatropic structure is studied. Influence of variatropic structure of cellular concretes on strength characteristics of products based on them is studied. It is confirmed that products based on cellular concrete with variable density from the periphery have sufficiently good thermal insulation properties due to the low density i...
IOP Conference Series: Materials Science and Engineering, 2021
The paper presents mathematical modeling of additives and water’s effect on foam concrete’s compr... more The paper presents mathematical modeling of additives and water’s effect on foam concrete’s compressive and flexural strength at 28 days of normal hardening. The requirements of GOST 10180-2012 determined the compressive and flexural strength of foam concrete. The initial composition of the foam concrete mix was calculated using the absolute volume method. Results received first-order regression equations. The compressive strength and flexural strength of foam concrete depended on the relations from x1(WOPC+BFS)tox3(SF90OPC) and the image surface expression and objective function for the regression equations. The optimal value obtained: compressive strength = 8.075 MPa and flexural strength 1.087 MPa.
This study uses the mathematical method of two-factors rotatable central compositional planning t... more This study uses the mathematical method of two-factors rotatable central compositional planning to predict and simulate the effect of the ratio of water-cement (N/X) and sand - binder (C/CKD) as the input parameters on the objective functions of the spreading flow of concrete mixtures and the compressive strength of fine-grained high-performence concrete (FGHPC) at 28 days. Results of the study showed that, from the material source in Vietnam, it is possible to FGHPC with a flow of 18.5 cm in the mini cone, its compressive and flexural strengths at the age of 28 days are 68.5 MPa and 6.13 MPa, respectively. Furthermore, from the obtained objective functions, it has been shown that the both two-input parameters have a significant influence on the values of the experimental models. Particularly, using Matlab software is showed the expression surface, the contour line of the experimental models, and determined the maximum value of compressive strength of FGHPC at this age of 69.84 MPa ...
Bulletin of Belgorod State Technological University named after. V. G. Shukhov, Nov 20, 2019
Blast furnace slag is a waste of metallurgical industry which can be used in production technolog... more Blast furnace slag is a waste of metallurgical industry which can be used in production technology of concretes and mortars. The expedient use of blast furnace slag as a component for new building materials will improve the environmental situation and increase the economic efficiency of production. The authors reaserch blast furnace slag processing technology of factories "Hoa Phat" (Vietnam) and "Thai Nguyen" (Vietnam) to produce mineral additives. As a result of the conducted researches the chemical and mineralogical composition of slags are received, their physical and mechanical characteristics are considered and defined: specific surface area, density, water demand, and others. According to standard of Vietnam and Russia, slag activity index is calculated when considering the possibility of using blast furnace slags to replace part of the binder. The relationship between the strength of the cement-sand mortar and density affected by the binder are reveald (where; binder = Portland cement + Granulated blast furnace slag). Comparison chart of slag activity index IR (%) has been shown. The paper uses the Vietnamese standard TCVN 11586: 2016 to analyze the possibility of using blast furnace slag (Vietnam) in the technology of concrete and mortar construction.
Journal of Physics: Conference Series, Dec 1, 2019
The present study evaluated the combined effects of organic-mineral additive based on a superplas... more The present study evaluated the combined effects of organic-mineral additive based on a superplasticizer SR 5000F and the active mineral additive Fly Ash, Blast Furnace Slag and Silica Fume SF-90 on properties of foam concrete (FC). The calculation of mixture proportions of FC is applied in accordance with the absolute volume method. Besides, the compressive strength and flexural strength of foam concrete are determined by Russian standard GOST 10180-2012. The results from experiments show that flexural and compressive strength of the FC obtained respectively, from 3.25 to 5.08 MPa and from 13.91 to 26.87 MPa. The use of an organic-mineral additive in the mixture was led to increasing the compressive and flexural strength of foam concrete at the age of 28 days, respectively, from 8% to 93% and from 6% to 56%. The relationship between compressive strength and curing age, compressive and flexural strengths of the FC were also determined in this investigation. The results of this study demonstrated that the use of appropriate amounts of fly ash and blast furnace slag to partially replace natural sand could produce eco-friendly foam concrete, which has many positive environmental impacts.
Foam concrete has been widely used in the High-Rise buildings for both structural, non-structural... more Foam concrete has been widely used in the High-Rise buildings for both structural, non-structural purposes and other applications. This paper discusses the development of foam concrete containing various the water-cement ratios from 0.4 to 0.8 was prepared from ordinary Portland cement SEM I 42.5 N and foaming agent of EABASSOC. Effects of the water-cement ratio on the porosity structure of foam concrete, as well as dry density and strength of the tested foam concrete, were discussed. Moreover, quantitatively simulation of the relationship between compressive strength at age 28 days and dry density of foam concrete is determined through experimental results for predicting the properties of foam concrete from the knowledge of its mixture proportions. Results of this study showed that the water-cement ratio can influence the porosity in the microstructure of foam concrete, while the optimal water-cement ratios of the foam concrete prepared with design density of 400, 500, 600, 700, and 800 kg/m 3 are also obtained of 0.58, 0.54, 0.56, 0.55, and 0.53, respectively.
Nowadays various light concrete types have many advantages as compared to heavyweight concrete (t... more Nowadays various light concrete types have many advantages as compared to heavyweight concrete (total structures mass decrease, increased thermophysical properties, less material consumption). Various industrial wastes use such as fly ashes, slag and bottom ash was suggested to enhance the light concretes effectiveness. This is greatly important for a green light concrete production since it is very important to obtain new types of environmentally friendly materials using wastes. The article substantiates the light concrete use and creation with organo-mineral additives based on industrial waste, analysis of the second-order mathematical model describing the bottom ash (BA) amount effect of Vung Ang TPP and expandable polystyrene spheres (EPS) on the light concrete density and compressive strength at the age of 28 days of normal hardening is done. In this work, the BA and EPS amounts varied from 14.5 to 45.5%, respectively, of the cement weight and from 24.5 to 55.5% of the concrete...
The benefits of using waste materials as a partial replacement for cement in high performance con... more The benefits of using waste materials as a partial replacement for cement in high performance concrete are also discussed. This paper presents the combined effects of bottom ash TPP “Vung Ang” and expanded polystyrene aggregate on different the properties of light-weight concrete. Twenty different concrete mixtures with a water to cement ratio of 0.4 and superplasticizer to cement ratio of 0.015 were used. On the one hand, the EPS was partially replaced with (0 ÷ 40)% by volume of concrete mixture. On the other hand, the fine aggregate was replaced with (0 ÷ 30)% by mass of BA TPP “Vung Ang”. The engineering properties, including workability, density and compressive strength of light-weight concrete were investigated at different curing times. The level of decrease in the strength depends upon the replacement level of EPS and BA. Specifically, the concrete containing 40% EPS and 30% BA at 28 days of age decrease in average density and strength were 43.2% and 26.4%, respectively, in ...
Lightweight aerated concrete (LAC) is produced by making LAC involves the addition of a gas-formi... more Lightweight aerated concrete (LAC) is produced by making LAC involves the addition of a gas-forming admixture like aluminium powder (AP) to a wet mortar mixture. In concrete during curing, AP will react with the calcium hydroxide in the mixture to form hydrogen. The amount of gas-forming is dependent on the mechanical properties requirements. The aim of the current work was to investigate the properties of aerated concrete (AC) containing 30% fly ash and various AP content, including dry density, porosity and modulus of elasticity, as well as strengths of test specimens. The results of this study showed that when AP content increased, the density of AC decreased, but its porosity increased. Whereas an increase in the amount of AP caused a decrease in both the compressive strength, tensile strength and the modulus of elasticity of ACspecimens. The investigation of newly modified AC through combination of local by-product in Vietnam would decrease the content of Portland cement was used and as well as reduce the amounts of ash and slag TPP as well as industrial waste thrown at a landfill. Therefore, assisting the thermoelectric power plants to be more environmentally friendly in the future.
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