Aigul Sambetbayeva

@mok.edu.kz

Faculty of Construction Technologies, Infrastructure and Management
International Educational Corporation

Aigul Sambetbayeva


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https://researchid.co/aigulsambetbayeva

RESEARCH, TEACHING, or OTHER INTERESTS

Materials Science, Process Chemistry and Technology, General Materials Science, Building and Construction
3

Scopus Publications

Scopus Publications

  • Bulk thermostabilization and surface UV activation as a wood modification method for glued beams in long-span structures
    Zh.M. Isaeva, K.V. Saerova, R.R. Safin, A.K. Sambetbayeva
    Construction Materials and Products, 2026
    This paper presents an innovative two-stage physicochemical modification approach for softwood species, aimed at enhancing the operational reliability of glued laminated timber beams used in long-span building structures. In the first stage, bulk thermal modification (TM) is carried out in the exhaust gas atmosphere of a waste-heat boiler at 180–240 °C, resulting in reduced hygroscopicity, improved dimensional stability, and enhanced biological resistance. In the second stage, the surface layer of the thermally modified wood undergoes ultraviolet (UV) irradiation (wavelength: 253 nm; dose up to 7.4 kJ/m²) to restore hydrophilicity and improve adhesive bonding performance. Experimental results confirm that the contact angle of the surface decreases from 82° (TM only) to 8° at a UV dose of 7.4 kJ/m² – corresponding to a 90 % increase in wettability. Shear strength of the adhesive joint increases by 22.4 % compared to untreated thermally modified wood and approaches the level observed for joints made from untreated pine wood (deviation < 9 %). After two-stage modification, the mechanical performance of glued laminated beams – specifically, the modulus of rupture in static bending – reaches 58.3 ± 2.1 MPa, fully complying with the requirements of GOST 20850-2014 for glued laminated timber structures of strength class C24 and above. The proposed technology successfully combines the high moisture and biological resistance of thermally modified wood with reliable adhesive bonding-an essential requirement for load-bearing structural elements exposed to cyclic variations in temperature and humidity.
  • IMPROVING THE STRENGTH OF COMPOSITE MATERIAL THROUGH THE EFFECTIVE MODIFICATION OF THE SURFACE OF THE CELLULOSE FILLER
    Elmira Kurmanbekova, Aigul Sambetbayeva
    Eastern European Journal of Enterprise Technologies, 2022
    An effective technique has been devised in order to increase the strength of arbolite, based on the method of rice husk thermal treatment. Given the fading of the surface layer of the grains during thermal exposure, the accompanying elements are removed from the outer cellulose fibers of the husk structure, that is, the texture of the surface of the material changes. It is known that the strength of multicomponent materials depends on the strength of bonds between the structural elements and the strength of the elements themselves. In arbolite, the strength of the constituent elements is great but the strength of arbolite almost does not exceed 2.5–3.5 MPa. Therefore, one of the factors determining the strength of arbolite is the adhesion strength of its heterogeneous particles. Therefore, a necessary and mandatory condition for the preparation of rice husks is soaking them in water, as well as the use of chemical additives for their treatment. This study's results established that the surface of the modified rice husk is chemically more active than without treatment. The use of chemical additives made it possible to neutralize the effect of extractive aggregates on cement due to the formation of additional chemical bonds in the contact zone and reduce their toxic effect on cement when removed from this zone. As a result of thermal exposure, a new potential property is revealed in the rice husk, which is expressed in the modification of the husk by changing the texture of its surface, which, when mixed with cement, enhances the adhesive adhesion of the surfaces. The rice husk thermal treatment method was employed to increase the class of arbolite to B 2.0 in terms of compressive strength, that is, arbolite of structural purpose was obtained, used as load-bearing structures in low-rise construction
  • EVALUATION OF PROTECTIVE PROPERTIES OF COATINGS OF FILLED COMPOSITIONS BY ELECTROCHEMICAL METHODS
    News of the National Academy of Sciences of the Republic of Kazakhstan Series of Geology and Technical Sciences, 2022