The Role of High Carbon Additives on Physical–Mechanical Characteristics and Microstructure of Cement-Based Composites

Pokorný, Jaroslav; Ševčík, Radek; Zárybnická, Lucie; Podolka, Luboš

doi:10.3390/buildings13071585

Cited by 6 publications

(8 citation statements)

References 49 publications

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“…Thus, these experimental studies show that it is possible to use coal dust as a partial replacement for cement in a rational amount. It has a positive effect on the physical and mechanical characteristics of foam concrete, which is also confirmed by a number of other studies [62][63][64][65]. For example, in [64], when replacing part of the cement with coal dust of up to 5% in heavy concrete technology, an increase in mechanical strength is observed due to a decrease in overall porosity and increased formation of hydration products.…”

Section: Resultssupporting

confidence: 65%

“…It has a positive effect on the physical and mechanical characteristics of foam concrete, which is also confirmed by a number of other studies [62][63][64][65]. For example, in [64], when replacing part of the cement with coal dust of up to 5% in heavy concrete technology, an increase in mechanical strength is observed due to a decrease in overall porosity and increased formation of hydration products. Similarly, in [62][63][64][65][66], the use of coal dust in the technology of heavy concrete in a rational amount helps to improve performance characteristics.…”

Section: Resultssupporting

confidence: 65%

“…For example, in [64], when replacing part of the cement with coal dust of up to 5% in heavy concrete technology, an increase in mechanical strength is observed due to a decrease in overall porosity and increased formation of hydration products. Similarly, in [62][63][64][65][66], the use of coal dust in the technology of heavy concrete in a rational amount helps to improve performance characteristics. As for the use of coal dust specifically in the technology of cellular concrete, as was mentioned earlier, it functions as a mineral stabilizer similar to silica smoke, fly ash, and slag.…”

Section: Resultsmentioning

confidence: 99%

See 2 more Smart Citations

Structural Formation and Properties of Eco-Friendly Foam Concrete Modified with Coal Dust

Stel’makh,

Shcherban’,

Beskopylny

et al. 2023

J. Compos. Sci.

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Foam concrete is a popular energy-efficient construction material with a fairly wide range of usage in buildings and structures. Increasing ecological efficiency and reducing construction costs by the application of different types of industrial waste in the manufacturing technology of this composite is a promising direction. The main goal of this study is to investigate the possibility of coal dust (CD) waste inclusion in the technology of energy-efficient cellular concrete produced by foam concrete technology. Test samples of foam concrete were made using coal dust by partially replacing cement in the range of 0–10% in increments of 2%. The following primary characteristics of foam concrete were studied: fluidity of mixtures; compressive strength; density; thermal conductivity of foam concrete. An X-ray diffraction analysis of foam concrete composites was performed, which showed changes in their phase composition when using coal dust as a modifier. Coal dust in rational quantities from 2% to 6% improves the physical and mechanical characteristics of foam concrete and increases the structure uniformity. The optimal values of the foam concrete characteristics were recorded at a dosage of coal dust of 6%. At the same time, the density decreased by 2.3%, the compressive strength increased by 15.6%, and the thermal conductivity coefficient decreased by 8.9% compared to the ordinary composition. The use of the resulting foam concrete is advisable in enclosing structures to create high energy efficiency of buildings and structures due to the improved structure and properties.

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Section: Resultssupporting

confidence: 65%

Section: Resultssupporting

confidence: 65%

Section: Resultsmentioning

confidence: 99%

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Structural Formation and Properties of Eco-Friendly Foam Concrete Modified with Coal Dust

Stel’makh,

Shcherban’,

Beskopylny

et al. 2023

J. Compos. Sci.

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“…The biomass used for the production of biochar is converted into a stable carbon fraction, thus being removed from the natural degradation that would lead to the emission of greenhouse gases. Moreover, cement-based composites filled with biochar showed an improvement in mechanical properties with respect to traditional cements [28,29].…”

Section: Introductionmentioning

confidence: 97%

Analysis of Electromagnetic Shielding Properties of Cement-Based Composites with Biochar and PVC as Fillers

Ruscica,

Peinetti,

Natali Sora

et al. 2024

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Biochar (bio-charcoal) is a low-cost and eco-friendly material. It can be obtained by thermochemical conversion of different biomass sources, for example, in the total absence of oxygen (pyrolysis) or in oxygen-limited atmosphere (gasification). The porous carbonaceous structure of biochar, resulting from the thermal treatment, can be exploited in cement-based composite production. By introducing biochar powder or other fillers in the cement paste, it is possible to enhance the shielding properties of the cement paste. The environmental impact of polyvinyl chloride (PVC) can be reduced by reusing it as a filler in cement-based composites. In this work, cement-based composites filled with different percentages of biochar and PVC are fabricated. The scattering parameters of samples with 4mm thickness are measured by mean of a rectangular waveguide in the C-band. The shielding effectiveness of reference samples without any filler and samples with biochar and PVC is analyzed. A combination of 10 wt.% biochar and 6 wt.% PVC provides the best shielding performance (around 16 dB).

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“…This problem is inherent in many countries and regions of the world where the mining industry is well developed. Enterprises and scientific institutes in such countries face a serious challenge in developing proposals at the fundamental and applied levels to study the possibility of using such coal dust [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Eco-Friendly Sustainable Concrete and Mortar Using Coal Dust Waste

Shcherban’,

Stel’makh,

Beskopylny

et al. 2023

Materials

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Finding the solution to the problem of the accumulating waste from the mining and processing industries, as well as reducing their carbon footprint, is among the most important tasks today. Within the construction industry, in the field of the production of building materials such as concrete, these problems may be solved through the use of waste and by saving the binder component. The purpose of this study is to substantiate the feasibility of using waste coal dust (CD) in concrete and cement–sand mortars as a partial replacement for cement. Test samples were made by partially replacing cement with CD in an amount from 0% to 10% in increments of 2% by weight. The following main characteristics were studied: mobility and density of mixtures, as well as density, compressive strength, bending strength and water absorption of concrete and mortars. X-ray diffraction and microscopic analysis methods were used in this work. The introduction of CD to replace part of the cement, up to 10%, did not have a significant effect on the density of concrete and mortar mixtures but reduced their workability. The best values of physical and mechanical characteristics were recorded for concrete and mortar with 4% CD. The increases in the compressive strength of concrete and mortars were 6.6% and 5.7%, and in flexural strength 6.1% and 5.6%, respectively. Water absorption decreased by 9.7% for concrete and by 9.3% for mortar.

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The Role of High Carbon Additives on Physical–Mechanical Characteristics and Microstructure of Cement-Based Composites

Cited by 6 publications

References 49 publications

Structural Formation and Properties of Eco-Friendly Foam Concrete Modified with Coal Dust

Structural Formation and Properties of Eco-Friendly Foam Concrete Modified with Coal Dust

Analysis of Electromagnetic Shielding Properties of Cement-Based Composites with Biochar and PVC as Fillers

Eco-Friendly Sustainable Concrete and Mortar Using Coal Dust Waste

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