Effect of a complex modified additive based on post-alcohol bard on the strength behavior of concrete

Altynbekova, A.D.; Lukpanov, R.E.; Dyussembinov, D.S.; Askerbekova, A.M.; Gunasekaran, M.

doi:10.31643/2023/6445.34

Cited by 3 publications

(3 citation statements)

References 17 publications

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“…Reducing the water-cement ratio at the production stage shortens the setting time, which in turn improves the strength characteristics of the foam concrete. These results are confirmed by numerous studies in the field of construction materials and technologies [12][13][14][15][16][17][18][19][20][21][22][23][24][25].…”

Section: Introductionsupporting

confidence: 75%

Research of foam concrete quality by two-stage foam injection method in comparison with classical foam concrete

Lukpanov,

Dyussembinov,

Altynbekova

et al. 2024

tbus

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The article presents a method of production of foam concrete, which involves two-stage injection of foam. The proposed method involves improving the pore structure of foam concrete, due to a more uniform distribution of pores throughout the volume of the material. Laboratory tests were carried out for two types of samples, represented by the proposed method of foam concrete production by two-stage foam injection with the use of modified additive in comparison with the classical foam concrete. The density of Type 1 samples varies from 410 to 793 kg/m3 (coefficient of variation from 5.12 to 7.31%), while the density of fiberboard samples lies within the range from 539 to 655 kg/m3 (coefficient of variation from 2.66 to 3.14%). The results of greater variation of densities by height in the Type 1 sample relative to the Type 2 sample indicate the influence of the technological process of foam concrete production on the quality of the pore structure of the material. The results of strength evaluation showed a large scatter of Type 1 samples in relation to Type 2 samples. The highest values of CM strengths are logically observed in the lower part of the sample and the lowest in the upper location: 44.04 and 32.33 kg/cm2 (coefficient of variation from 5.15 to 9.54%). For Type 2 samples, the same values are 55.18 and 44.44 kg/cm2, for the lower and upper locations, respectively (coefficient of variation from 2.79 to 5.35%). The results of thermal conductivity measurements of Type 1 samples range from 0.098 to 0.203 W/m0C (coefficient of variation from 4.59 to 11.88%), while the densities of Type 2 samples lie between 128 and 162 W/m0C (coefficient of variation from 3.38 to 3.55%).

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Section: Introductionsupporting

confidence: 75%

Research of foam concrete quality by two-stage foam injection method in comparison with classical foam concrete

Lukpanov,

Dyussembinov,

Altynbekova

et al. 2024

tbus

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“…The latter is especially dangerous, as they can interact with alkalis and cause destruction of the cement matrix. Therefore, control of sand quality and its composition is important to ensure the durability and reliability of foam concrete structures [ [16], [17], [18], [19], [20]].…”

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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“…Today, both builders and researchers are very interested in the use of ferroalloys production waste -microsilica in concrete. The positive effect of microsilica as a fine active mineral additive and the necessity of its use in concrete in combination with superplasticizer was described in publications about 40 years ago [ [18], [19], [20]].…”

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 a complex modified additive based on post-alcohol bard on the strength behavior of concrete

Cited by 3 publications

References 17 publications

Research of foam concrete quality by two-stage foam injection method in comparison with classical foam concrete

Research of foam concrete quality by two-stage foam injection method in comparison with classical foam concrete

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

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

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