Mohamed Bachir Bouiadjra

Nano-tungsten-based alloys and composites are renowned for their outstanding thermal resistance, high thermal conductivity, and excellent corrosion resistance, making them highly suitable for applications in extreme thermal and chemical environments. This study presents an analytical investigation into the flexural behavior of nanocomposite plates reinforced with a novel steel–nano-tungsten alloy. The analysis is conducted using a refined plate theory (RPT) that incorporates a sinusoidal shape function and a displacement field accounting for both normal and shear deformations, while involving only four unknowns. The effective elastic properties of the nanocomposite are estimated through the Mori–Tanaka homogenization scheme. The developed model is validated against existing analytical solutions, and the influence of key parameters on the plate’s stress and displacement responses is thoroughly examined.

This study aims to elucidate the impact of varying waste glass powder (WGP) content in the concrete mixture on the critical buckling temperature loads (ΔTcr) of thin eco-concrete panels. Our analysis employs the small elastic deformation theory to simulate the eco-concrete panel analytically. The thermo-mechanical performance of the structure is evaluated using Hognestad's homogenization model and compared to the preliminary reference curve for the elasto-plastic behavior of concrete. The equations of motion for thin eco-concrete panels impregnated with different proportions of WGP are determined using elastic governing equations for solids and solved according to the system boundary conditions. The results indicate that as panel thickness decreases and the width-to-length (b/a) ratio increases, the critical temperature (ΔTcr) decreases. Furthermore, an increase in the percentage of WGP in high-performance concrete results in a higher critical temperature (ΔTcr). These findings support and encourage the use of WGP in construction concrete, highlighting the potential environmental benefits of incorporating waste materials to promote ecological sustainability.

Given their considerable specific surface area and amorphous characteristics, nanoparticles exhibit excellent pozzolanic activity, and when undergoing a reaction with calcium hydroxide, this leads to the generation of a denser matrix by promoting the formation of a greater amount of C-S-H gel, thereby enhancing the strength and durability of the concrete and fortifying the overall structure. Indeed, the present study investigates a comparative study of the buckling and free vibration analyses of concrete beams reinforced with various types of nanoparticles. For its simplicity and accuracy, a higher-order shear deformation theory will be used to analytically model the reinforced concrete beam. Furthermore, the powerful Eshelby’s model is used to derive the equivalent nanocomposite properties. The soil medium is simulated with Pasternak elastic foundation, including a shear layer, and Winkler’s spring, interlinked with a Kerr foundation. The motion equations are derived using Hamilton’s principle. Moreover, based on Navier’s analytical methods, the closed-form solutions of simply supported beams have been obtained. Different parameters, such as type and volume percent of nanoparticles, geometrical parameters, choice of theory and soil medium, on the buckling and dynamic behavior of the beam, are exercised and shown. The major findings of this work indicate that the use of nanoparticles in concretes increases better mechanical resistance and amplifies the natural frequencies. In addition, the elastic foundation has a significant impact on the buckling and vibration performances of concrete beams.

Acknowledging the growing impact of nanotechnologies across various fields, this engaging research paper focuses on harnessing the potential of nano-sized materials as enhancers for concretes. The paper emphasizes the strategic integration of these entities to comprehensively improve the strength and performance of concrete matrixes. To achieve this, an analytical study is conducted to investigate the static behavior of concrete beams infused with different types of clay nano-platelets (NC’s), employing quasi-3D beam theory. The study leverages the effective Eshelby’s homogenization model to determine the equivalent elastic characteristics of the nanocomposite. The intricate interactions of the soil medium are captured through the use of a Winkler–Pasternak elastic foundation. By employing virtual work principles, the study derives equations of motion and proposes analytical solutions based on Navier’s theory to unravel the equilibrium equations of simply supported concrete beams. The results shed light on influential factors, such as the clay nano-platelet type, volume percentage, geometric parameters, and soil medium, providing insights into the static behavior of the beams. Moreover, this research presents previously unreported referential results, highlighting the potential of clay nano-platelets as reinforcements for enhancing structural mechanical resistance.

Nanoparticles, by virtue of their amorphous nature and high specific surface area, exhibit ideal pozzolanic activity which leads to the formation of additional C-S-H gel by reacting with calcium hydroxide, resulting in a denser matrix. The proportions of ferric oxide (Fe₂O₃), silicon dioxide (SiO₂), and aluminum oxide (Al₂O₃) in the clay, which interact chemically with the calcium oxide (CaO) during the clinkering reactions, influence the final properties of the cement and, therefore, of the concrete. Through the phases of this article, a refined trigonometric shear deformation theory (RTSDT), taking into account transverse shear deformation effects, is presented for the thermoelastic bending analysis of concrete slabs reinforced with ferric oxide (Fe₂O₃) nanoparticles. Thermoelastic properties are generated using Eshelby’s model in order to determine the equivalent Young’s modulus and thermal expansion of the nano-reinforced concrete slab. For an extended use of this study, the concrete plate is subjected to various mechanical and thermal loads. The governing equations of equilibrium are obtained using the principle of virtual work and solved using Navier’s technique for simply supported plates. Numerical results are presented considering the effect of different variations such as volume percent of Fe₂O₃ nanoparticles, mechanical loads, thermal loads, and geometrical parameters on the thermoelastic bending of the plate. According to the results, the transverse displacement of concrete slabs subjected to mechanical loading and containing 30% nano-Fe₂O₃ was almost 45% lower than that of a slab without reinforcement, while the transverse displacement under thermal loadings increased by 10%.