Technobius

Corrigendum to “A. Omarov and Y. Iwasaki, “Comparative study of pile quality control techniques”, tbus, vol. 4, no. 1, p. 0055, Mar. 2024. doi: 10.54355/tbus/4.1.2024.0055”

Abdulla Omarov — 2025-06-28

Refers to: "A. Omarov and Y. Iwasaki, “Comparative study of pile quality control techniques”, tbus, vol. 4, no. 1, p. 0055, Mar. 2024. doi: 10.54355/tbus/4.1.2024.0055"

In the originally published version of this article, the following corrections have been made:
In the Abstract, the sentence:
“...with 1,896 bored piles subjected to rapid testing. Significant findings reveal that approximately 75% of tested shafts exhibited anomalies, emphasizing the necessity for meticulous quality control...”
was inadvertently included and has now been removed to accurately reflect the scope and content of the study.
In the paragraph preceding Figure 5, the phrase:
“...and financial support of L.N. Gumilev ENU and KGS LLP...”
has been revised to read:
“...support of KGS-Astana LLP...”
to correct the source of technical support.
In the same paragraph, additionally, the sentence:
“A total of 1,896 bored piles were tested between February and October 2018...”
was excluded to align with the finalized dataset and timeframe discussed in the article.
These corrections do not affect the overall conclusions of the article.
The authors apologize for any confusion this may have caused.

Spatial interpolation of the latest Quaternary and older Mesozoic sediment soils

Akmaral Yeleussinova — 2025-05-05

The paper presents a comparison of three methods of interpolation of engineering-geological parameters of soils: Empirical Bayesian Kriging (EBK), ordinary Kriging, and Inverse Distance Weighting (IDW). The initial data were obtained from bored wells on the territory of the residential complex in Astana city. Interpolation was performed along a horizontal section at a depth of 10 m for the parameters: cohesion, modulus of deformation, and friction angle. The results were visualized as heatmaps. Comparative analysis showed that the EBK 3D method provides a higher degree of detail and robustness to insufficient data density compared to IDW and Kriging, making it the most preferred method for 3D modeling of soil mechanical properties.

Improvement of the crack resistance of reinforced concrete sleepers using modified concretes

Ilyas Abdraimov — 2025-06-04

This paper presents research on the potential use of modified fiber-reinforced concrete for reinforced concrete sleepers, intending to increase their strength characteristics, crack resistance, and service life. To investigate the influence of reinforcing elements on the crack resistance of heavy concrete, chopped basalt fiber and, for comparison, polypropylene fiber were added to the concrete mix, both of which have shown promising performance. The results of the study showed that the modified heavy concrete exhibited improved crack resistance due to the formation of additional low-basic calcium hydrosilicates, compaction, and strengthening of the cement matrix, as well as the contribution of fibers to the formation of a spatially reinforced cement stone structure. The nature of the fracture of prism samples made from modified concrete and their crack resistance characteristics were evaluated. The results showed that samples with basalt fiber had a 40.59% increase in maximum load, a 40.5% increase in the conditional stress intensity factor, and a 40.49% increase in bending stress compared to the reference samples without fiber. In addition, the samples with basalt fiber demonstrated increases of 7.1%, 6.93%, and 6.9% in maximum load, bending stress, and stress intensity factor, respectively, compared to samples containing polypropylene fiber.

Studying the material orthotropy effect under the plane stress state of triangular plates

Моldir Beketova — 2025-06-13

The article deals with the plane stress state of elastic thin orthotropic plates in the form of irregular triangles; orthotropy is assumed to be both physical and constructive. The research method used is the numerical finite difference method using a grid of scalene triangles. For such a grid, the authors have obtained resolving finite difference equations; in difference form they have obtained correct records of boundary conditions on the plate edges through the stress function based on the frame analogy taking into account the material orthotropy; typical finite difference equations are presented that allow solving problems of the plane stress state of triangular plates with a high degree of automation. As an illustrative example, a numerical calculation of triangular plates with a grid density of N = 8 is performed using a computer; the result of the study is the analysis of the stress state in the calculated grid nodes with a wide variation in the values of the a lateral edges angles of inclination to the base of the triangle, the orthotropy coefficients. The results obtained demonstrate the feasibility and effectiveness of using a finite difference scheme on irregular triangular grids for analyzing the plane stress state of orthotropic plates. The developed approach provides a solid theoretical foundation for modeling stress distributions in structures with geometric and material anisotropy. The flexibility of the method allows adapting it to a wide range of boundary conditions and geometric configurations, laying the groundwork for further analytical development and integration into engineering software tools for structural analysis.

Effect of paraffine wax on the mobility of injection cement mortars

Zhibek Zhantlessova — 2025-06-17

This study investigates the mobility of injection mortar and the influence of a paraffin-based modified additive on its flowability. The research pursues two main objectives: to develop the optimal composition of the additive and to evaluate its effect on mortar mobility at various concentrations. The additive significantly enhances mortar mobility, achieving peak performance at a 0.6% concentration. Further increases beyond 0.6% slightly reduce mobility but maintain an overall positive effect. Additionally, higher concentrations contribute to improved solution stability, as reflected by a reduced coefficient of variation. The additive not only improves the flow characteristics of injection mortar but also ensures its homogeneity and stability. The optimal additive dosage is determined to be within the range of 0.6% to 1.0% by cement weight. The application of digital image analysis in the study demonstrated high measurement accuracy and reproducibility, confirming its suitability for evaluating construction mixtures. The proposed additive shows strong potential for use in construction applications requiring high mortar mobility without compromising structural integrity.

Investigation of the properties of fly ash and slag-based geopolymer concrete containing waste glass aggregates

Zhuzimkul Urkinbayeva — 2025-06-28

This paper evaluates the geopolymer concrete produced using industrial waste and waste glass obtained by crushing glass materials. Geopolymer concrete mixtures were prepared with a water-to-binder ratio of 0.35 and an alkali activator solution to binder ratio (AAS/B) of 0.5 and 0.4. The partial substitution of sand by waste glass was 10%, 20% and 30%. Laboratory results showed that the compressive strength of geopolymer concrete increased with the addition of waste glass for a geopolymer concrete with AAS/B = 0.5, but decreased for AAS/B = 0.4. The expansion due to the alkali-silica reaction (ASR) was below 0.1% which is the expansion limit. The shrinkage of geopolymer concrete during drying decreases with an increase in glass content. The results of this study indicate that using glass as a partial sand substitute in geopolymer concrete provides sufficient mechanical properties. In addition, the production of this concrete will improve environmental conditions by reducing the extraction of raw materials and recycling waste glass.