Defense of the dissertation of Zhantlessova Zhibek for the degree of Doctor of Philosophy (PhD) in the specialty «8D07361 - Production of building materials, products and structures»
L.N. Gumilyov Eurasian National University, a dissertation defense for the degree of Doctor of Philosophy (PhD) by Zhantlessova Zhibek on the topic «Development of a modified additive composition for soil improvement technology using the deep cementation method» to the educational program «8D07361 – Production of building materials, products and structures».
The dissertation was carried out at the «Technology of industrial and civil construction education department» of L.N. Gumilyov Eurasian National University.
The language of defense is russian
Official reviewers:
Talal Awwad – PhD, Professor, St. Petersburg State University of Railway Transport of Emperor Alexander I (St. Petersburg, Russian Federation).
Jeong Ku Khang – PhD, Professor, Incheon National University (Incheon, Republic of Korea).
Temporary members of the Dissertation Council:
Aniskin Aleksej – Candidate of Technical Sciences, Associate Professor, Department of Civil Engineering, University North (Varazdin, Croatia).
Tokanov Daniyar Tokanovich – Candidate of Technical Sciences, Associate Professor, Dean of the Faculty of Architecture and Civil Engineering, A. Saginov Karaganda Technical University (Karaganda, Republic of Kazakhstan).
Moldamuratov Zhangazy Nurzhanovich – PhD, Design Engineer of «Taraz Arkon» LLP (Taraz, Republic of Kazakhstan).
Scientific advisors:
Lukpanov Rauan Ermagambetovich - PhD, Аssociate Professor, Research Professor, Department «Technology of Industrial and Civil Engineering» L.N. Gumilyov Eurasian National University (Astana, Republic of Kazakhstan).
Gintaris Kaklauskas – Doctor of Technical Sciences, Professor at the Department of Reinforced Concrete Structures and Geotechnics at Vilnius Gediminas Technical University (Vilnius, Lithuania).
The defense will take place on January 29, 2026, at 11:00 AM in the Dissertation Council for the training direction «8D073 – Architecture and Civil engineering» in the specialty «8D07361 – Production of building materials, products and structures» of L.N. Gumilyov Eurasian National University. The meeting of the Dissertation Council will be held in offline and online formats on the Microsoft Teams platform.
Link: https://inlnk.ru/68gELP
Address: Astana, K. Satpayev str. 2, Educational and administrative building, auditorium No. 302.
Abstract (English): ANNOTATION of the dissertation work by Zhantlessova Zhibek Beisembayevna on the topic «Development of the composition of a modified additive for the technology of soil improvement by the method of deep cementation» submitted for the degree of Doctor of Philosophy (PhD) under the educational program 8D07361 – «Production of Building Materials, Products, and Structures» Purpose of the study: The purpose of the study is to develop and experimentally evaluate the composition of a modified additive based on a paraffin component for the deep cementation technology to enhance the efficiency of soil strengthening under complex hydrogeological conditions. The developed additive must ensure improved physical and mechanical properties of cemented soils, as well as increased resistance to moisture and aggressive environments. Research objectives: 1. To analyze modern chemical and mineral additives used in soil stabilization technologies in order to assess their effectiveness and identify promising directions for binder modification. 2. To study the characteristics of raw materials used in the production of cemented soils (cements, various soil types, secondary mineral resources) to determine their suitability and their influence on the final properties of the strengthened soil mass. 3. To develop the composition and production method of a new complex modified additive (MA), as well as to determine its optimal dosage in the cement–soil mixture. 4. To investigate the influence of MA on the technological properties of cement paste and cement–soil mixtures, including water retention, setting, and strength characteristics. 5. To assess the effect of MA on strength and water permeability. 6. To optimize the composition of the modified additive using methods of mathematical experiment design, taking into account strength indicators and economic feasibility. 7. To conduct pilot-industrial implementation of the research results, including the application of MA at a real deep cementation site followed by a techno-economic evaluation of the technology. Research methods: The methodological framework of the dissertation is based on the theory of cement system hardening, mechanics of dispersed media, and scientific principles of construction mortars and soil stabilization compositions. The following methods were used: 1. Theoretical analysis of literature and patent sources regarding cement system modification and soil strengthening technologies. 2. Experimental studies to determine rheological, physicochemical, and mechanical properties of cement paste and cement–soil mixtures with varying MA content. 3. X-ray diffraction and electron microscopy for analyzing the morphology and phase composition of cement stone and strengthened soil. 4. Physical and mechanical testing following GOST and SNiP standards: determination of strength, water absorption, frost resistance, and resistance to aggressive environments (sulfate corrosion, acidic medium). 5. Processing of experimental data using mathematical statistics to ensure reliability and representativeness. 6. Pilot-industrial application of the developed technology at real construction sites, followed by assessment of efficiency and durability of the modified strengthened soil mass. Key findings (scientifically proven hypotheses and new knowledge): 1. Based on physico-chemical studies of cement, sand, and paraffin, the necessity of preliminary raw-material selection considering granulometric composition and activity has been substantiated, as these factors influence the structure of cemented soil under deep cementation. 2. A new composition of a complex modified additive adapted for the engineering-geological conditions of Kazakhstan has been developed. It includes organic and mineral components that ensure increased strength, water resistance, and stability of the strengthened soil mass. 3. The influence of the additive on hydration processes and the formation of the cement matrix has been experimentally established, contributing to reduced porosity and a denser structure of cemented soil. 4. An improvement in performance characteristics of cemented soil has been demonstrated: strength increases by 10–12%, while water absorption decreases by 25%. 5. An approach has been developed for determining the optimal composition of cemented soil, based on the relationship between additive concentration, water–cement ratio, and strength characteristics. A methodology of laboratory-model testing has been developed and validated, including digital flow-spread analysis and stand tests of injection mixtures in model soil, which for the first time enabled quantitative evaluation of rheology and flowability under conditions close to field environments. 6. The techno-economic efficiency of the modified additive has been confirmed, showing improvements in physical-mechanical characteristics of strengthened soil, reduced cement and water consumption, and increased durability of the strengthened array. Main research results: The reliability of the scientific results obtained in the dissertation is ensured by several objective factors: 1. Laboratory and field experiments were carried out using modern measurement equipment, enabling highly accurate determination of physical-mechanical characteristics of modified cemented soils. 2. Standard methodologies and regulatory documents (GOST, SNiP, ST RK, etc.) were applied at all research stages, ensuring reliability, reproducibility, and comparability of results. 3. Multistage processing of experimental data, including statistical analysis, confidence interval construction, factor significance assessment, and comparison with analogous studies presented in scientific literature. 4. Use of modern software tools, including mathematical experiment design and mixture optimization through Statistica, Excel, and other analytical platforms, strengthening the scientific reliability of the conclusions. 5. Practical testing of the additive’s effectiveness via pilot-industrial cementation of water-saturated soils at a construction site, which confirmed stability of the strengthened mass and economic feasibility of MA application. Justification of novelty and importance: Scientific novelty is reflected in the following: 1. For the first time in Kazakhstan, a comprehensive modified additive composition for deep cementation technology was developed, taking into account chemical-mineralogical specifics of local cements and loess-type soils. The additive is based on an organo-mineral system with paraffin and acidic components, ensuring structural stability under wet and aggressive conditions. 2. A scientifically grounded methodology has been proposed for selecting compositions of modified cement systems, involving a multilevel procedure: raw-material testing, digital evaluation of mobility, and optimization based on mathematical experiment design. This methodology allows the additive to be adapted to specific engineering-geological conditions. 3. A digital method for analyzing cement paste flow spread has been developed and implemented, based on photofixation followed by image processing to calculate flow area with high accuracy. This significantly improves the reliability and reproducibility of rheological assessments. 4. The mechanism of structure formation in modified cemented soil has been experimentally substantiated, linked to the formation of hydrophobic microfilms on cement particle surfaces, resulting in reduced capillary porosity, lower bleeding, and increased compressive strength. 5. For the first time, laboratory and model tests were compared, including injection of cement mixtures into a sand medium with pressure and flow control. The obtained data revealed patterns in the influence of additive concentration on flowability, pore filling uniformity, and monolith formation within the soil mass. 6. An experimental-analytical model of techno-economic efficiency of the modified additive in deep cementation technology has been developed. It has been demonstrated that the new additive composition enables reduction of cement consumption by 12–15% and water by 10%, while increasing durability and reducing overall construction costs. 7. A comprehensive methodology for assessing durability and service reliability of strengthened soils has been developed and tested, based on criteria of strength, water absorption, frost resistance, and corrosion resistance. This methodology enables prediction of service life under wet and aggressive conditions and is recommended for practical use in construction organizations of Kazakhstan. Compliance with national scientific priorities or government programs: This research is funded within the framework of program-targeted financing by the Committee for Science and Higher Education of the Republic of Kazakhstan (grant No. BR21882278 «Creation of a construction-engineering center providing a full cycle of accredited services for the construction and road-construction sector of the Republic of Kazakhstan»). Description of the applicant’s contribution to each publication: The applicant made a substantial contribution to all publications. The dissertation results were published in national and international peer-reviewed journals. 1. Lukpanov, R., Zhantlessova, Z., Dyussembinov, D., Zhumagulova, A., & Jexembayeva, A. (2025). Modified Additive for Soil Stabilization by Deep Cementation. Buildings, 15(19), 3607. https://doi.org/10.3390/buildings15193607 2. Lukpanov, R., Dyussembinov, D., Altynbekova, A., Zhantlessova, Z., & Smoljaninov, A. (2022). Study of the pore structure of foam concrete using a two-stage foaming method. Technobius, 3(4), 0047. https://doi.org/10.54355/tbus/3.4.2023.0047 3. Lukpanov, R., Dyussembinov, D., Zhantlessova, Z., Altynbekova, A., & Smoljaninov, A. (2023). Approximative approach to optimize concrete foaming concentration in two stage foaming. Technobius, 3(3), 0041. https://doi.org/10.54355/tbus/3.3.2023.0041 4. Zhantlessova, Z., Lukpanov, R., Dyussembinov, D., Yenkebayev, S., Tsygulyov, D., & Karacasu, M. (2025). Effect of paraffine wax on the mobility of injection cement mortars. Technobius, 5(2), 0080. https://doi.org/10.54355/tbus/5.2.2025.0080 5. Zhantlessova, Zh. B., Lukpanov, R. E., Altynbekova, A. D., Tsigulev, D. V., & Jeksembayeva, A. E. (2025). Evaluation of the Effect of a Modified Additive on the Physico-Mechanical Properties of Injection Grouts. Bulletin of the L.N. Gumilyov Eurasian National University. Technical Science and Technology Series, 152(3), 247–256. https://doi.org/10.32523/2616-7263-2025-152-3-247-256 6. Mukhambetkaliyev, K., Zhibek Zhantlessova (2025). THE INFLUENCE OF A MODIFIED ADDITIVE BASED ON A PARAFFIN COMPONENT ON THE WORKABILITY AND SETTING TIME OF AN INJECTION GROUT FOR THE DEEP SOIL CEMENTATION METHOD. International Journal of GEOMATE, 29(132). https://doi.org/10.21660/2025.132.4876 7. Zhantlessova, Zh., Lukpanov, R., Dyussembinov, D., Yenkebayev, S., Tsygulyov, D., & Kaklauskas, G. (2025). ASSESSMENT OF THE INFLUENCE OF A MODIFIED ADDITIVE ON THE STRENGTH CHARACTERISTICS OF INJECTION GROUTS IN THE DEEP CEMENTATION METHOD. Mechanics and Technologies, 2, 327–335. https://doi.org/10.55956/hjal8562
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