This study presents a field-based assessment of the operational safety of a reinforced concrete overpass in Astana, Kazakhstan, using combined static and dynamic load testing. The structure is a three-span overpass with 41.0 m reinforced concrete main spans formed by prefabricated UBS 187.14 blocks with variable cross-sections. Static tests were conducted using six ballast-loaded trucks with an average weight of 21.0 t, while dynamic tests were performed under moving vehicle loads at speeds ranging from 3.5 to 70 km/h. The measured maximum static deflection at midspan was 23.5 mm, which is substantially lower than the regulatory limit of 102.5 mm for the 41 m span. Dynamic measurements showed stable structural behavior, with principal frequencies of 3.37–3.39 Hz in the main vibration modes and damping ratios of 3.5%–3.8%, exceeding the minimum reference value of 1.5% for reinforced concrete structures. The recorded vibration periods were outside the code-defined critical ranges, indicating no resonance-related operational concern.

This article assesses the structural performance of a bridge overpass with a new type of reinforced concrete prestressed T-beams (TBN-abbreviation for stressed T-beams). Compared with VTK bridge beams (VTK-abbreviation: high-tech transportation construction), prestressed T-beams have technological advantages in the production process and during installation that allow for increased spacing, from 1400 mm for high-tech transport structure type beams to 2200 mm for prestressed T-beams. The study aims to evaluate the reliability of 24-m long prestressed T-beams and operation of their joints as part of a bridge overpass.

Гидрогеологиялыќ жұмыс режимінің сүзгінің бітелу сипатына және жайылымдарды суаруѓа арналѓан ұңғымалардың сүзгіге жақын аймағына әсері және уақыт бойынша сүзгіге жақын аймаќтың қалыңдығындағы қысым жоғалту градиентінің өзгеру заңдылықтары зерттелді. Су ұңғымаларының дебитінің төмендеуі сүзгілердің жєне сүзгіге жақын аймақтардың бітелуінің әртүрлі түрлерімен байланысты және ыңғыымалардың жұмыс режиміне байланысты екені көрсетілген. Бітелу аймағының өлшемі 100 мм-ден аспайды, ал лай, саз және ќұм бөлшектері 1 мм-ден аз мөлшердегі бөлшектер бітелуге 296 N E W S of the National Academy of Sciences of the Republic of Kazakhstan алып келеді. Құрылыстың белгілі бір тоқтаулары бар суару пункттеріндегі ыңғымаларды, сондай-ақ суару және тік дренаждық ыңғымаларды пайдаланудың маусымдылығымен сипатталатын Қазақстандағы құрғақ жайылымдарды тарату желісінің бар болуы жағдайында олардың жұмысы әсіресе сүзгі аймаѓында суару және тік дренаждыќ ыңғымаларды пайдаланудың маусымдылығымен сипатталады. Сүзгі мен сүзгіге жақын аймақтың бітелу сипатын аныќтау үшін суды алудың әртүрлі режимдерінде осы аймақтағы қысым жоғалту градиентінің өзгеру ерекшеліктері зерттелді. Қысым жоғалту градиентінің қарқынды қалпына келуі суды алудың тұрақсыз режимінде жүреді, ал біркелкі режимде өзгеріс сүзгіге жаќын аймаќтыњ бүкіл ќалыңдығы бойынша тұрақтанады. Суды алудың тұрақсыз режимінде 70 мм ќалыңдықтағы қиыршық тас төсенішінде және іргелес аймаќта қондырғы 20 күн жұмыс істегеннен кейін топыраќтың механикалық ќұрамы үлкен гетерогенділікке ие.

The results of experimental studies aimed at improving the strength characteristics of cement stone and finegrained self-compacting concrete through the use of polyfunctional modifying additives based on nano-silicon dioxide (nano-SiO2) and micro-dispersed mineral components are presented. It was established that the introduction of 0.03% nano-SiO2 by weight of cement increases the compressive strength of cement stone by up to 32%, which is associated with the intensification of clinker mineral hydration processes, the formation of an additional amount of low-base calcium hydrosilicates, and an increase in the number of crystallization centers in the early stages of hardening. The effectiveness of the combined use of nano-SiO2 with microsilica and micro-calcite, which are similar in composition to cement but differ in structure and functional activity, has been experimentally confirmed. The use of two-component systems made it possible to increase the flexural strength of cement stone by up to 29% compared to the reference samples. The greatesteffect was achieved by adding a polyfunctional three-component additive, including nano-SiO2, microsilica, and microcalcite, to the composition of fine-grained self-compacting concrete. The use of this system increased the compressive strength of concrete by 44% (to class B60) and the flexural strength by up to 12.5 MPa (an increase of 53.7% relative to the reference composition).

The integration of modern computer technologies into the construction industry is transforming design and building processes, offering professionals numerous advantages. One of the most significant advancements is the adoption of virtual modeling tools, which enhance design accuracy, improve project quality, and reduce implementation time. These technologies also optimize material costs, making construction more efficient and cost-effective. A major milestone in this digital transformation is the widespread use of Building Information Modeling (BIM) technologies, such as Revit and Archicad. These programs create a unified software environment that streamlines project management across all stages, from initial design to construction and operation. Additionally, they enable the development of complex architectural forms through 3D printing, further expanding the potential of modern construction methods. The success of 3D printing in construction depends heavily on advanced materials, particularly fine-grained concrete with inorganic binders. While these materials enhance durability and structural integrity, their development remains a challenge due to strict technical requirements. Overcoming these challenges requires a scientifically grounded approach to optimizing material composition and ensuring seamless integration into additive manufacturing processes. In conclusion, the fusion of digital tools with construction methodologies significantly improves efficiency, precision, and sustainability.

Жҧмыста жеке қорғаныс қҧралдарын берудің «тізімдік» тәсілінен халықаралық тәжірибеде қолданылатынға кӛшуді негіздеу ҥшін Еуропалық Одақ, АҚШ, Канада, Ресей Федерациясы елдерінің мысалында нормативтік-қҧқықтық реттеудің халықаралық аспектісінде ӛнеркәсіптік кәсіпорында жеке қорғаныс қҧралдары қамтамасыз етудегі тәуекелге бағдарланған тәсілдің ерекшелігі қарастырылады. Қазіргі уақытта Қазақстан Республикасында ӛнеркәсіптік қауіпсіздік пен еңбекті қорғауды қамтамасыз ету мақсатында белгіленген нормалар негізінде жеке қорғану қҧралдарын беруге қатаң регламенттелген тәсіл қолданылады. Пандемия кезіндегі жаппай жҧқтыру жағдайлары тәуекелдің сипатын, оның ішінде кәсіби сипатын ескермей, қолданылатын нормативтік тәсілдің тиімсіздігін кӛрсетті. Сондықтан бҧл бағытта қауіпті ӛндірістік объектілерде, әсіресе зиянды еңбек жағдайларында жҧмыс істейтін қызметкерлердің кәсіби тәуекелін ескере отырып, жаңа тәсілдерді ғылыми негіздеу қажеттілігі туындайды.

Insurance is an integral element of the modern economic system. Nature and civilization generate new risks, so people, the state and business need similar insurance protection systems. Kazakhstan, in accordance with the program of innovative and industrial development, strives for dynamic growth of industry, its diversification, along with social and labor aspects of production activities. The main focus is not only on technology, modernization of equipment and investments, but also, first of all, on the safety of workers and the preservation of their ability to work. Real progress can be achieved taking into account the effective experience of developed countries in the field of occupational safety and health. In this regard, it will be necessary to pay attention to the foreign experience of economically developed countries with developed legislations that establish various standards regarding labor protection requirements

The paper considers a comparative analysis of the legal acts of providing workers with personal protective equipment of the European Union, the USA, Canada, the Russian Federation and other countries to justify the transition from the «list» approach to the issuance of personal protective equipment to the one used in international practice. Currently, the Republic of Kazakhstan uses a strictly regulated approach to the issuance of personal protective equipment based on established standards. The conditions of mass infection during the pandemic showed the ineffectiveness of the applied regulatory approach, without taking into account the nature of the risk. Therefore, in this direction there is a need for scientific substantiation of new approaches, taking into account the professional risk of the employee. During the review of international and domestic legal norms, key points of differences were identified, namely the use of a risk-based approach as the most modern and in line with modern trends and realities in ensuring the safe work of workers. Establishing a clear link with the results of occupational risk assessment will ensure the risk-oriented mechanisms for issuing personal protective equipment and training in safe work methods, which are modern measures of safe work in accordance with international legal practice

At the underground mines of Kazakhmys Corporation, where different types of highly productive self-propelled equipment with different types of pneumatic wheel drive are operated, there are significant downtime of technological equipment. As practice has shown, application of repair system with use of old methods and means, at operation of underground self propelled equipment appeared to be ineffective. One of the main reasons of low efficiency of self-propelled machines operation is the absence of the system of continuous monitoring of technical condition of each machine and its aggregates with application of methods and means of diagnostics. To avoid failure, it is necessary to establish the predicted and residual resource at a certain operating time of the machine according to the diagnostics data. This paper outlines the results of research on predicting the residual life of machine units used in the conditions of the mine corporation “Kazakhmys”.

. The study of the resistance of the bulldozer blade burial at a stationary machine is aimed at studying the force factors acting on the working tool during its penetration into the ground. When the machine is not moving, the blade deepening causes an increase in passive resistance from the ground, which acts on the front and rear edges of the blade. This resistance increases with the depth of burial, which requires an increase in force for further advancement of the working body into the ground. An important feature is that in the initial stages of blade insertion, the resistance at the front face increases significantly, increasing the forces. At the rear edge, the re-sistance also increases as the blade deepens. Cutting angles have a significant effect on resistance changes: at higher cutting angles, the resistance decreases, reducing the load on the working mechanisms. The results of the study emphasize that for efficient knife deepening with the machine stationary, higher cutting angles should be used, which reduces passive resistance, improving productivity and reducing energy costs.