Publications Internationales
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Item Synthesis of resin from Alfa stem to applied as an adhesive corrosion-resistant coating(Springer Nature link, 2025) Toubal, Sara; Aribi, Chouaib; Chentir, Imen; Safi, Brahim; Bouaissi, Aissa; Saidi, MohammedThe demand for eco-friendly alternatives to petrochemical-based phenolic resins has risen due to increasing concerns about climate change, environmental impact, and manufacturing costs. This study introduces a sustainable approach by partially replacing phenol with lignin, a natural polymer rich in phenolic groups, extracted from Alfa stems. Using the alkaline method, 50% of phenol was substituted with lignin to synthesize phenol–formaldehyde (PF) resins. The synthesized lignin–phenol– formaldehyde (LPF) resin was characterized to verify its chemical structure and physical properties. The resin demonstrated significant antioxidant and antibacterial activity, particularly against E. coli and P. aeruginosa gram-negative bacteria at a concentration of 20 mg/ml. Additionally, the lignin substitution provided notable advantages over conventional industrial resin formulations. The lignin’s properties closely influenced the formulation of the LPF resin, making it similar to the reference CPF resin. However, the lower intensity observed in the LPF resin suggests potential limitations in the methylol group formation compared to the CPF resin. The antioxidant activity of LPF resin has been effectiveness in preventing cor- rosion on steel surfaces. When applied as an anti-corrosion coating and compared to industrially used CPF resins, LPF resin demonstrates its efficacy in such applications. Also, it should be noted that the impedance modulus of the elaborated resin coating remained consistently low throughout the entire immersion period, indicating its stable performance.Item Mechanical Properties of Alfa, Sisal, and Hybrid Alfa/Sisal Fiber Satin Cloth Reinforced Epoxy(Springer Nature, 2024) Baali, Besma R.; Gherbi, Mohammed Tahar; Nour, Abdelkader; Casimir, J.B.; Saci, Rachid; Aguib, Salah; Attia, Nourhane; Aribi, ChouaibThe mechanical behavior of composites, made of an epoxy resin matrix reinforced by 30 and 40% of a satin cloth from long Alfa, sisal and hybrid Alfa/sisal fibers was studied. The fibers are obtained by extraction with elimination of binders such as pectins and lignin. For each type of fibers, appropriate and optimal chemical and thermal treatments were conducted within NaOH solution, to enhance both the fiber surface quality and the interfacial bonding between fibers and matrix. Fourier transform infrared (FTIR), scanning electron microscopy (SEM), and chemical decomposition of treated and untreated fibers lead to prove the treatment efficiency. The thermogravimetric (TGA) and differential thermogravimetric (DTG) analyses showed better thermal stability. Differential scanning calorimetry (DSC) made it possible to quantify the enthalpy changes which showed an increase in the amount of heat as a function of the increase in weight fraction of natural fibers. The endothermic reaction of the composites studied containing 30 wt% fiber reinforcement was less than that containing 40 wt% fiber reinforcement. The composite materials were produced by vacuum assisted resin transfer molding (VARTM) method due to hydrophilic nature of the fibers. The results of static tests were compared to those of pure epoxy resin. It showed a significant increase for 40 wt% woven A1lfa/epoxy of about 333, 113, and 81% in tension, 3-points bending and compression tests respectively. SEM morphology analysis revealed good interfacial adhesion between the treated fibers and the matrix.Item An experimental study on damaged cementitious mortars repaired by glass/epoxy composite materials(Sciendo, 2020) Aribi, Chouaib; Bouaissi, Aissa; Safi, Brahim; Saidi, MohammedThis paper presents an experimental investigation on the post-repair flexural response of mortars with and without damage. In order to improve the mechanical properties of the damaged mortars, which were subjected to different loads ranging between 40 % and 90 %, the mortars specimens were reinforced and repaired using two different composite materials, the first with only epoxy resin, while the second consisted of a mixture of epoxy resin and glass fiber. The results show a significant improvement in the stiffness damaged. Therefore, the reinforced specimens by a layer of resin on the lower side surface increased the bending strength by 58 %, when compared to those control samples. The reinforcement using composite resin-fiber of glass exhibited considerable increases in the safety of constructions. The SEM images of damaged samples with and without repair, revealed the impact of reinforced glass fibers-mortar on the matrix-mortar by improving theirs mechanical performancesItem Etude expérimentale de la réparation des structures d'aéronefs par collage des patchs à base d’époxy et fibre de verre = Experimental study of repair of aircraft structures by adhesive patches based on epoxy and fiberglass(2019) Basaid, Djamel; Benmounah, Abdelbaki; Aribi, Chouaib; May, AbdelghaniLes matériaux composites présentent une faiblesse aux chocs et aux impacts, des études ont été effectuées par plusieurs chercheurs afin de minimiser les conséquences de ces défauts, qui mènent souvent à des réparations temporaires ou permanentes. La présente étude a pour objectif d'investiguer des cas de réparation des structures d'avions. Ces réparations sont appliquées aux défauts survenus sur les matériaux composites de la structure d'avion de type « Impact Faible Energie » en utilisant la méthode patch de composite à matrice époxy : EPOCASTA50-1, la résine est sans dilution renforcée par des tissus de fibres de verre de même type que celui du fuselage d'avion. L’efficacité de ces réparations est vérifiée par l’étude du comportement en traction classique. Pour la caractérisation à l'état endommagé et la validation des résultats, la méthode de contrôle non destructif CND a été utilisée sur des éprouvettes élaborées dans les mêmes conditions que les plaques de réparation fixées sur le fuselage d'avionItem Influence of the shrinkage and the slenderness of fibers on the properties of the mortars destined for the concretes fiber(Mouloud Mammeri University of Tizi-Ouzou, 2015) Benyounes, Khaled; Aribi, Chouaib; Meziani, Ramzi; Benmounah, AbdelbakiItem Elaboration and characterization of composite material based on epoxy resin and clay fillers(Universidad Nacional Autónoma de México (UNAM), 2017) Laouchedi, Dalila; Bezzazi, Boudjema; Aribi, ChouaibThe present work aims at investigating the effect of locally produced clay (Algeria), along with the effect of their size and rate on physical and mechanical properties of the composite material. This study is divided into two parts: The first one is devoted to the study of the composite material based on epoxy resin with kaolin, using different size fractions at rates ranging from 2% to 20%. The second part examines epoxy resin-based composite with calcined kaolin (metakaolin) with regard to the influence of the structure, the particle size and the charge rate on the properties of the material. It is shown that the clay fillers give the epoxy resin different properties compared to the epoxy resin alone and, additionally, reduce the cost of materials. It was also observed that the fillers enhance the mechanical properties by increasing the rigidity of the material. There is a maximum value of 2.4 GPa to 18% kaolin, or more than 325% increase in the modulus of elasticity with respect to unfilled resin for the finer particle size. It was also found that the modulus of elasticity increases with increasing the loading rate. Indeed, the rigidity increases with increasing the filler rate. Moreover, for both fillers, lower fraction yields better results. Moreover, for both types of added fillers, lower fraction yields better resultsItem FTIR analysis and rheological behavior of bisphenol : a diglycidyl ether resin filled Fume-Silica(2014) Irekti, Amar; Bezzazi, Boudjema; Boualam, Chahrazed; Aribi, Chouaib; Dilmi, HamidSilica-fume as fillers into polymers materials affect significantly the physical, mechanical and the electrical properties of the polymers. The polymer that we studied here is an epoxy based resin (STR) and silica fume (FS). This paper presents the dependency of the rheological behavior of the STR epoxy resin on the FS content within a temperature at which the reaction thermoset is neglected. We used a cone-plate viscometer for the study of the rheological behavior, and a scanning electron microscope is used for the analysis of the dispersion state of the FS in STR epoxy resin. Compared to the control without loads, an increase of 50% of the shear stress and the plastic viscosity were recorded for the composite. The software Rheowine viscometer enabled us to model and identified the rheological behavior of these mixtures with resin. The results obtained in this modeling, confirmed that the resin mixtures have shear-thinning rheological behavior, this last give us the model of Ostwald de WaeleItem Experimental study of dielectric properties of composite materials pozzolan/DGEBA(2015) Irekti, Amar; Bezzazi, Boudjema; Smith, Agnès; Aribi, ChouaibItem Mechanical and physicochemical characterization of an epoxy-based composite reinforced with fibrous biopolymer byproduct(Springer, 2015) Malek, Ammar; Aribi, ChouaibItem Dielectric behavior study of thermosetting matrices loaded(2012) Irekti, Amar; Hami, B.; Aribi, Chouaib; Bezzazi, B.The present study was prospective in nature and its purpose is twofold. It consists, on the one hand, to identify and characterize mineral fillers, secondly, to determine the dielectric properties of materials prepared using the epoxy resin mixed with local inorg anic fillers , very rich in silica such that: sandy, pozzolan, cullet and a small calcium carbonate amount. This application allows us to use the matrix developed as an electrical insulator. The results of our study show that the use of fillers further im proves the dielectric properties of these matrices. After 32 days of conditioning, the values of capacitance and resistance obtained are very remarkable. Comparing our results with previous work with the addition of pure silica, we note that our composites have better properties at a low cost. The hygro - thermal influence is much less important fo r the loaded resin. Our composites may be subject to external environmental influences and they have a range of wide usage in dielectric materials