Browsing by Author "Bahrami, Alireza"

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Citation - WoS: 21
Citation - Scopus: 23
Application of Waste Ceramic Powder as a Cement Replacement in Reinforced Concrete Beams Toward Sustainable Usage in Construction
(ELSEVIER, 2023) Aksoylu, Ceyhun; Öztiliç, Yasin Onuralp; Bahrami, Alireza; Yıldızel, Sadık Alper; Hakem, İbrahim Y.; Özdöner, Nebi; Başaran, Boğaçhan
The main purpose of this study was to investigate the flexural behavior of reinforced concrete beams (RCBs) containing waste ceramic powder (CP) as partial replacement of cement. For this purpose, flexural tests were carried out using various amounts of mixing ratios. By determining the amount of CP utilized in the optimum ratios, it was aimed both to make predictions for design engineers and to show its beneficial effect on the environment by recycling the waste material. For this purpose, twelve specimens were produced and verified to monitor the flexural behavior. The longitudinal reinforcements percentage (0.77%, 1.21%, and 1.74%) and CP percentage (0%, 10%, 20%, and 30%) were chosen as the parameters. CP could be effectively used up to 10% of cement as a replacement material. Increasing the CP percentage by more than 10% could considerably reduce the load-carrying capacity, ductility, and stiffness of RCBs, specifically when the longitudinal reinforcements percentage was high. In other words, as CP increased from 0% to 30%, the load-carrying capacity decreased between 0.4% and 27.5% compared with RCBs with the longitudinal tension reinforcements of 2 phi 8 without CP. However, reductions of 5.5-39.8% and 2.15-39.5% in the load-carrying capacity occurred respectively compared with RCBs with the longitudinal tension reinforcements of 2 phi 10 and 2 phi 12 without CP. The achieved longitudinal reinforcements percentage was close to the balanced ratio, while more than 10% CP cannot be used without any precautions for mixtures.
Citation - WoS: 3
Citation - Scopus: 4
Behavior of Functionally Graded Carbon Nanotube Reinforced Composite Sandwich Beams With Pultruded Gfrp Core Under Bending Effect
(Frontiers Media Sa, 2024) Madenci, Emrah; Özkılıç, Yasin Onuralp; Bahrami, Alireza; Hakem, İbrahim Y.; Aksoylu, Ceyhun; Asyraf, Muhammad Rizal Muhammad; Beskopylny, Alexey N.
A novel generation of composite sandwich beams with laminated carbon fiber-reinforced polymer skins and pultruded glass fiber-reinforced polymer core materials was examined for their flexural behavior. The strength and failure mechanisms of the composite sandwich beams in flatwise and edgewise configurations were investigated using three-point static bending tests. These sophisticated composite structures must be designed and used in a variety of sectors, and our research provides vital insights into their performance and failure patterns. In comparison to the reference specimens (FGM-1), the carbon nanotube-reinforced specimens' bending capacity was affected and ranged from -2.5% to 7.75%. The amount of the carbon nanotube addition had a substantial impact on the beams' application level and load-carrying capacity. Particularly, the application of 0.5 wt% additive in the outermost fiber region of the beams, such as in FGM-4, led to an increase in the bending capacity. However, the stiffness values at the maximum load were decreased by 0.3%-18.6% compared to FGM-1, with the minimum level of the decrease in FGM-4. The experimental results were compared with the theoretical calculations based on the high-order shear deformation theory, which yielded an approximation between 11.99% and 12.98% by applying the Navier's solution.
Retraction: Application of Waste Ceramic Powder as a Cement Replacement in Reinforced Concrete Beams Toward Sustainable Usage in Construction
(Elsevier, 2024) Aksoylu, Ceyhun; Ozkilic, Yasin Onuralp; Bahrami, Alireza; Yildizel, Sadik Alper; Hakeem, Ibrahim Y.; Ozdoner, Nebi; Karalar, Memduh
[No Abstract Available]
Retraction: Crashworthiness Performance of Filament Wound Gfrp Composite Pipes Depending on Winding Angle and Number of Layers
(Elsevier, 2024) Hakeem, Ibrahim Y.; Ozkilic, Yasin Onuralp; Bahrami, Alireza; Aksoylu, Ceyhun; Madenci, Emrah; Asyraf, Muhammad Rizal Muhammad; Fayed, Sabry
[No Abstract Available]