Browsing by Author "Stel'makh, S.A."

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Citation - WoS: 60
Citation - Scopus: 70
Shear Performance of Reinforced Expansive Concrete Beams Utilizing Aluminium Waste
(Elsevier Editora Ltda, 2023) Özkılıç, Y.O.; Karalar, M.; Aksoylu, C.; Beskopylny, A.N.; Stel'makh, S.A.; Shcherban, E.M.; Qaidi, S.
Shear damage is a catastrophic failure in the design of reinforced concrete structural elements. To prevent it, the effect of aluminum wastes on reinforced concrete shear beams was investigated in this study. There is a gap in the scientific field on the expanding concrete with aluminium waste, and no research has been done on the utilizing of aluminum waste to produce expandable concrete. Moreover, there is a gap in expandable concrete usage with aluminum waste reinforcing, which is crucial for engineering applications especially beams, slabs and columns. For this purpose, experimental investigations were performed on a total of 12 Reinforced Concrete Beams (RCB) with different aluminum waste ratio (0, 1, 2 and 3 vol.%) and different shear reinforcement spacing (270, 200 and 160 mm). The depth span ratio was chosen as 1.6, 2.0 and 2.7. RCB was simply supported on the loading frame and subjected to four-points bending. As a result of experimental tests for each sample, the maximum load, stiffness, ductility and energy dissipation capacity were calculated. It was observed that the load capacity of the Al refuse combined RCBs raises as the vacancy of the stirrup reinforcement reductions compared with reference RCBs. Furthermore, it was found that the load capacity of the RCBs reduced as the Al refuse quantity in the concrete mixture was increased from 0% to 3%. However, it was found that the decrease in load capacity for 1 vol.% aluminum waste could be tolerated. For this reason, it can be stated that aluminum waste (AW) in reinforced concrete shear beams will contribute to the beam up to 1%. © 2023 The Authors
Citation - WoS: 4
Citation - Scopus: 5
Structure Formation, Rheology and Properties of Sulfur Concrete Mixtures and Sulfur Concrete Modified With Bitumen and Stone Flour
(Elsevier Ltd, 2024) Beskopylny, A.N.; Stel'makh, S.A.; Shcherban', E.M.; Mailyan, L.R.; Meskhi, B.; Chernil'nik, A.; El'shaeva, D.
The development and improvement of cementless concrete, including by use of various types of refuse, is especially important due to their economic and environmental efficiency. Sulfur as a refuse of the oil and gas industry can act as the production of a binder of a new environmentally friendly building material - sulfur concrete (SC). The purpose of the study was to improve effective designs of SC containing refuse from the oil and gas and stone processing industries, and to analyze their rheological and physical and mechanical appearances. Methods of laboratory testing of SC samples, as well as microscopic analysis of its structure, were applied. SC with the best values of compressive strength (CS) and water occlusion has the following formula according to the content of the main components: sulfur - 20% of the mass; stone flour - 10% of the mass; crushed stone - 40% of the mass; sand - 30% of the mass; bitumen modifying additive - 6% by weight of sulfur. The mobility of these combinations is enhanced by up to 2.2 times by adding a bitumen addition to SC formulations. Compared with the control design, the optimal design of modified SC presented an enhancement in CS up to 105% and a reduction in water occlusion up to 70%. The structure of samples of SC of the optimal design does not have shrinkage cavities and pronounced phase boundaries, in contrast to the SC of the control design. © 2024 The Authors