Effect of Foaming Agent, Binder and Density on the Compressive Strength and Thermal Conductivity of Ultra-Light Foam Concrete

Gołaszewski, Jacek; Klemczak, Barbara; Smolana, Aneta; Gołaszewska, Małgorzata; Cygan, Grzegorz; Mankel, Christoph; Peralta, Ignacio; Röser, Frank; Koenders, Eduardus

doi:10.3390/buildings12081176

Cited by 30 publications

(10 citation statements)

References 43 publications

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“…The relevance of this study is due to the high demand for foam concrete in the modern construction market. Foamed concrete is characterized by a variety of physical and mechanical characteristics, ease of production, relative economy and small mass of blocks, which makes it very attractive for use in construction [ [4], [5], [6]]. Special interest in this material is caused by its unique properties, such as density, thermal conductivity and features of the cellular structure.…”

Section: Introductionmentioning

confidence: 99%

Assessment of the physical and mechanical characteristics of sand for the production of foam concrete using the two-stage foam injection method

Lukpanov,

Dyussembinov,

Altynbekova

et al. 2024

Kompl. Ispolz. Min. Syra = Compl. Use of Min. Resour.

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The article presents the results of experimental studies of the properties of quarry sand to assess their suitability for use in the production of foam concrete. The sites of quarry sand extraction in the territory of the Akmola region are analyzed and their physical and mechanical characteristics are characterized. Evaluation of the physical and mechanical characteristics of sand was made for four types of sand. The main evaluation parameters were: particle size distribution, homogeneity, shrinkage, density and moisture content of sands. The results of the study showed that the physical characteristics of sands vary depending on their type, which indicates the differences in the natural composition and properties of these materials. Evaluation of the homogeneity of the different types of sands confirms the significant differences between the types. The highest homogeneity (xmax=77.45; xmax-1=14.98; Cc=73.5%) was observed in type 1 sand, while type 4 sand shows the minimum degree of homogeneity (xmax=47.30; xmax-1=42.28; Cc=8.7%). According to the test results, the maximum values of both densities in type 2 are: ρd=1.519 g/cm2, ρw=1.951 g/cm2, and the minimum values of both densities in type 4 are: ρd=1.438 g/cm2, ρw=1.894 g/cm2. The maximum natural moisture content in Type 1 samples is vn=9.5%, while the minimum values are 7.6% and 7.2% (Type 2 and 4). The obtained private density values have a high degree of convergence because the coefficients of variation have very low values: for Type 1 sands are 0.1-0.3%; for Type 2 sands are 0.7-0.8%; for Type 3 sands are 0.5-0.7%; for Type 4 sands are 0.4-0.6% (variation of private density values of dry and wet sands, respectively). Analysis of the results of tests on the shrinkage of samples showed that the maximum shrinkage is observed for sands of type 1 equal to 15.63%, while the minimum shrinkage is characteristic of samples of type 3 and 4 (11.25% and 11.88%). Taking into account the suitability of sand for the production of foam concrete, the most preferable is Type 1 sand mined in the Eltok building sand deposit.

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Section: Introductionmentioning

confidence: 99%

Assessment of the physical and mechanical characteristics of sand for the production of foam concrete using the two-stage foam injection method

Lukpanov,

Dyussembinov,

Altynbekova

et al. 2024

Kompl. Ispolz. Min. Syra = Compl. Use of Min. Resour.

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“…However, the thermal conductivity of porous cement-based materials remains high due to the large thermal conductivity value of the cement-based matrix and the fact that the decreased percentage of thermal conductivity caused by pore structure optimization is highly limited [8,9]. Moreover, high porosity or low density can also be used to reduce thermal conductivity and improve thermal insulation ability [10,11], since the thermal conductivity of the increased phase (air) is extremely low. Usually, air voids, treated as macroscopic harmful pores, lead to a significant weakening of mechanical properties; therefore, achieving the balance of good thermal insulation performance and mechanical properties is difficult [12,13], greatly limiting the widespread application of cement-based porous materials.…”

Section: Introductionmentioning

confidence: 99%

Shrinkage Reduction in Nanopore-Rich Cement Paste Based on Facile Organic Modification of Montmorillonite

Yang,

Chen

et al. 2024

Materials

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The organic modification of montmorillonite was successfully achieved using cetyltrimethyl ammonium bromide under facile conditions. The modified montmorillonite was subsequently used for the fabrication of montmorillonite-induced nanopore-rich cement paste (MNCP), and the shrinkage behavior and fundamental performance of MNCP were also investigated. The results indicate that alkali cations on a montmorillonite layer surface were exchanged by using CTAB under 80 °C, successfully achieving the organic modification of montmorillonite. As a pore-forming agent, the modified montmorillonite caused a reduction in shrinkage: the 28-day autogenous shrinkage at a design density of 400 kg/m3 and 800 kg/m3 was reduced to 2.05 mm/m and 0.24 mm/m, and the highest reduction percentages during the 28-day drying shrinkage were 68.1% and 62.2%, respectively. The enlarged interlamellar pores and hydrophobic effects caused by the organic modification of montmorillonite aided this process. Organic-modified montmorillonite had a minor influence on dry density and thermal conductivity and could contribute to an enhancement of strength in MNCP.

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“…It is important to note that the variety of such stabilizing additives and their application methods allow finding the best solutions to strengthen the foam, which ultimately improves the quality and reliability of foam concrete structures. The rapid development of this area of research provides the construction industry with innovative solutions that help to reduce environmental impact and improve energy efficiency [ [9], [10], [11], [12], [13]].…”

Section: Introductionmentioning

confidence: 99%

Optimal concentration of post-alcohol bard and microsilica in cement-sand mixtures determination

Lukpanov,

Dyussembinov,

Altynbekova

et al. 2023

KIMS/CUMR/MShKP

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The article presents part of the results of the study of the components of foam concrete made by the two-stage foam injection method, in particular, the influence of microsilica and post-alcohol bard on the setting time and strength of cement. The paper shows the methodology for determining the compressive and flexural strength, selection of the composition of components, analysis, and evaluation of setting times, and strength characteristics of the compared samples. During the study, laboratory experiments were performed to better understand how these additives affect the behavior of cement mixtures. The studies carried out allow us to determine the influence of the modified additive components on the properties of foamed concrete during the production process. The setting time analysis presented in the study revealed that increasing the concentration of the additive significantly reduced the setting time performance of cement. With increasing the content of microsilica and post-alcohol bard at 10% and 30% of the cement weight, the setting initiation and completion times are significantly reduced. To evaluate the change in strength, samples were made and tested in compression and flexure at ages of 3, 7, 14, 21, and 28 days of normal moisture curing. According to the results, it was found that the additive, by accelerating the curing, promotes strength improvement both at an early age and at the design age (28 days). The experimental results showed that the flexural and compressive strength of the material increased as the concentration of the additive increased. The maximum increase in flexural and compressive strength was recorded at additive concentrations of 10% and 30%. This indicates the important role of additives in the strengthening of materials and their potential application in construction. The additive showed an optimum positive effect, therefore, the use of this percentage of additive is the most effective for increasing the compressive and flexural strength of concrete.

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Effect of Foaming Agent, Binder and Density on the Compressive Strength and Thermal Conductivity of Ultra-Light Foam Concrete

Cited by 30 publications

References 43 publications

Assessment of the physical and mechanical characteristics of sand for the production of foam concrete using the two-stage foam injection method

Assessment of the physical and mechanical characteristics of sand for the production of foam concrete using the two-stage foam injection method

Shrinkage Reduction in Nanopore-Rich Cement Paste Based on Facile Organic Modification of Montmorillonite

Optimal concentration of post-alcohol bard and microsilica in cement-sand mixtures determination

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