Browsing by Author "Zerizer, A."

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Caractérisation des bois de chêne Algériens par Scanner tomographique à rayons X et logiciel libre Image-J.
(University M'Hamed Bougara Boumerdes, 2013) Kennouche, Salim; Mothe, F.; Zerizer, A.; Aknouche, A.
Cette étude a pour objectif la détermination de la variation de la densité du bois à plusieurs échelles (en épaisseur de deux types de bois de chêne Algérien). L’analyse est basée sur l'absorption du rayonnement X généré par le scanner tomographique. Cette méthode a été mise au point par (Godefrey HOUNSFIELD en 1972). Ce travail permis de déterminer la distribution densitométrique de deux espèces de bois de chêne Algérien, le chêne Zeen (Quercus canariensis) et le chêne Afarès (Quercus Afarès) issus du massif forestier, zézaie de Yakouren (Tizi Ouzou). Des éprouvettes ont été découpées en tous en respectant la direction longitudinal-tangentielle (20*20*250) mm, puis exposées à une source de rayonnement X. Une fois développé, les images ainsi obtenues seront traitées à l'aide de logiciel libre typique d’analyse d’image (Image J). Chaque éprouvette est scannée dans le sens longitudinal en neuf (09) passages du scanner dans le sens radial avec une profondeur d’analyse d’ordre 0.15 mm. Ce qui nous a permis de récupérer 18 images qui seront traité par le logiciel Image-J. Le traitement est effectué sur plusieurs zones des échantillons de chaque image obtenue, l’analyse nous permis de mettre en exergue l’anisotropie des bois en se basant sur les valeurs obtenues de la densité des bois de chêne analysé
Characterization of algerians oak wood by x-Ray tomographic scanner and free software image-J
(Statny Drevarsky Vyskumny Ustav, 2014) Zerizer, A.; Sitouah, N.; Aknouche, A.; Mothe, F.; Kennouche, S.
Effects of corona discharge treatment on the mechanical properties of biocomposites from polylactic acid and Algerian date palm fibres
(2013) Amirou, Siham; Zerizer, A.; Haddadou, Imane; Merlin, A.
In this paper, biocomposites materials based on date palm fibres (untreated or treated with corona discharge) as reinforcing elements and polylactic acid matrices were prepared and characterized. The objective of this study was to evaluate the mechanical properties of these biocomposites by modification of date palm fiber by using corona discharge treatment which results in a surface oxidation. The morphology of processed biocomposites was studied by scanning electron microscopy. It was found that treated fibers of the reinforced composite showed superior mechanical properties as compared with untreated fiber reinforced composites due to the enhanced adhesion between the treated date palm fiber and the polylactic acid matrix. Changes in the surface chemistry were investigated with Fourier Transform infrared spectroscopy. Moreover, morphological studies by scanning electron microscopy demonstrated that better adhesion between the treated fiber and the matrix was achieved. Such studies are of great interest in the development of environmentally friendly composites from biodegradable polymers
Formulation and characterization of self compacting concrete with silica fume
(Academic journals, 2013) Kennouche, S.; Zerizer, A.; Benmounah, A.; Hami, Brahim; Mahdad, M.; Benouali, H.; Bedjou, S.
Self-compacting concrete (SCC) was elaborated using local materials and silica fume (SF) as admixture in 15% of cement quantity, two different Portland cements (PC) and two different superplasticizer that the chemical nature is polycarboxylate and plynaphtalene, the aggregates used are (AG 3/8 mm, AG 8/15 mm), coarse and fine sand (SC, SF) witch fineness modulus 3.2 and 1 in the order. The dosage of the different superplasticizer used is chosen after experimental spreading tests of each self compacting concrete formulation. Results of fresh concrete tests executed, as L-box and segregation resistance are on concordance whit values recommended by the French association of civil engendering. Also the mechanical characterization was conducted by compressive strength and splitting compression testing procedure, results values are in the range higher than 20 Mpa at the seven day by the compressive test for the all compositions, and the highest value was 40.93 MPa at the 28 day bay compressive test of the fourth’s formulation specimens, the values of splitting compressive tests of al formulation specimens at 7, 14 and 28 days, was situated between 2.01 and 4.40 MPa. In order to determine the superplasticizer saturation assay in of cement pasts used in self compacting concrete, the stady was completed by a rheological stady with a variable velocity gradient, so as to estimate the quantity of saturation assay of superplasticizer and the formulation, also the flow models of cement paste
Identification des fréquences de résonance et du module d’élasticité par la méthode d’analyse vibratoire
(2009) Daoui, Abdelhakim; Meslem, A.; Zerizer, A.; Marchal, R.
Le présent travail dont la méthodologie, largement utilisée dans le domaine de la dynamique vibratoire pour l’identification de module d’élasticité des matériaux, repose sur la recherche et l’interprétation du spectre des fréquences propres issues des vibrations naturelles en appliquant la théorie des poutres élastiques . La démarche expérimentale consiste en des essais de vibrations longitudinales sur des poutres (acier, bois) suffisamment longues pour déterminer les fréquences propres des matériaux. Les résultats d’identification ont montré une très bonne corrélation entre les valeurs théorique et les valeurs expérimentales obtenues :fréquences de résonance et modules d’élasticité des matériaux élaborés
Influence de l'angle d'inclinaison des cannelures sur le comportement à l'usure des cylindres broyeurs de blé
(European Journal of Scientific Research, 2008) Aknouche, Hamid; Zerizer, A.; Chemani, B.
Le suivi du comportement des équipements de l’industrie alimentaire, lors de leur exploitation est l’une des préoccupations majeures pour le maintien de la meilleure qualité des produits céréaliers. a perte des performances des mécanismes des machines alimentaires est due dans la plupart des cas à une dégradation importante causée par l’usure. Ce travail a pour finalité de répondre à des préoccupations liées à l’exploitation optimale des broyeurs à cylindres dans les entreprises algériennes de transformation des céréales. Les constructeurs de ces machines utilisent des caractéristiques de cannelures (les angles des cannelures) influençant leur blé local, ce qui déséquilibre leur exploitation dans les semouleries algériennes utilisant d’autres blés. Des relevés en milieu industriel ont été réalisés pour déterminer leurs durées de services. Une étude expérimentale faite sur un banc d’essai réalisé dans notre laboratoire, nous a permis de comparer le comportement à l’usure des cannelures de différentes pentes
Influence of boiling temperature on the panels lvl (laminated veneer lumber) quality made with oak ( canariensis) algeria wood
(2012) Kennouche, S.; Zerizer, A.; Aknouche, A.
The panels LVL (Laminated Veneer Lumber) are less used in construction, which are produced by peeling trunk of trees, undergone baking operation which one determined the quality of plating and LVL panels made by gluing. Our study here consist to vary the boiling temperatures ranging from 40C°, 50 C°, 60 C°, to 70 C° (two panels are drawn for each temperature, and 14 specimens (20 * 20 * 336mm) for each panels) that was secure settings peeling, speed of rotation of the lathe, pressure bar, clearance angle of the knife and the thickness of the veneer, as we fix the amount of glue 400g / cm2, the pressure pressing the panels in order to clearly identify the influence of baking temperature logs of Algerian oak wood quality. Our controls are carried out by non-destructive testing after that the specimens are tested with destructive method under four point bending, according to the perpendicular direction and parallel plating, and we took into consideration the calculation of Young's modulus and stress at break for each series of panels
Influence of veneer quality on beech lvl mechanical properties
(2011) Daoui, Abdelhakim; Clément, D.; Rémy, M.; Zerizer, A.
The quality of peeled veneers is generally quoted considering 3 main criteria: surface roughness, thickness variations and lathe checking. This last criterion impacts on mechanical properties of byproducts. It is well known that lathe checking occurrence can be reduced applying a good hygrothermal treatment of the round-wood before peeling coupled with optimised setting of pressure bar on the peeling lathe. It is also well known that thicker the veneer is and more difficult it is to reduce lathe checking and the other veneer defects. The tendency being to manufacture more eco-friendly engineering wood products using less glue, it is of interest to design such products with thicker layers and so less glue lines. But using ticker veneers should lead to a deterioration of final products mechanical properties. To quantify this effect, we have made 20-21mm thick LVL (Laminated Veneer Lumber) boards of beech (Fagus sylvatica) with various compositions (veneers 1, 3 or 5 mm thick). In order to obtained veneers enclosing different grades, several bolts of a same tree have been peeled following 4 different modalities changing wood conditioning temperature (20 / 70°C) and pressure bar settings (bar acting or not). The quality of all the veneers has been quantified before gluing. In total, 12 sets of boards have been produced for non destructive and destructive mechanical tests. The main results of these exploratory experiments are: - a quite low weakening of LVL mechanical properties when increasing veneer thickness. - the non destructive prediction of MOE by vibration seems not so good on LVL with thick veneers, especially in the case of edgewise loading, probably because of the presence of important lathe checks. - in some configuration, and especially when using thick veneers, it could be benefit to load LVL flatwise rather than edgewise. - for the measurement of shear strength on LVL, the 5-point bending test increases its efficiency when increasing veneer thickness. To properly order in a hierarchy the different veneer criteria impacting on LVL mechanical properties, new tests should be repeated on different LVL boards homogeneous for given criteria of veneer quality
Liaisons entre efforts de coupe, densité et états de surface de quelques composites à base de bois
(2012) Zerizer, A.; Martin, P.
Divers échantillons de composites à base de bois ont été étudiés du point de vue de leur comportement à l'usinage, de la qualité des surfaces produites et de leurs caractéristiques densitométriques. On a mis en évidence, l'influence de la densité et des conditions de coupe à travers Em (épaisseur moyenne du copeau) de ces panneaux sur les puissances et efforts de coupe, mais aussi la liaison de ces efforts avec la variation de la rugosité de surface de chants usinés, représentée par l'écart moyen Ra qui tient compte de la moyenne arithmétique des rugosités détectées le long d'un profil mesuré
Microstructure and corrosion behaviors of XC48 treated by rf magnetron sputtering TiAlN alloying
(IEEE, 2015) Madaoui, N.; Saoula, N.; Ait Djafer, Amina Zouina; Zerizer, A.
Modeling rot in wood by replacement of wood with sand : an experimental study
(2006) Zerizer, A.; Ouis, D.
Rot is known to affect the strength properties of wood. At the same time, the damping properties of the attacked material have also been shown to change. This article presents the results of an experimental study in which rot in wood was modeled by the replacement of wood with sand. The procedure entailed the drilling of holes in the body of a wooden beam, filling the holes with sand, and monitoring the changes induced by the sand-filled holes on the values of the modulus of elasticity (MOE) and of the loss factor. The MOE was calculated from the resonance frequency of the first longitudinal mode of vibration, and the loss factor was obtained indirectly from the impulse response by means of a room acoustical technique. The results show that the MOE value, and hence the strength characteristic of the wood specimen, decreases at the same time as the loss factor increases
Particleboards production from date palm biomass
(Springer Berlin Heidelberg, 2013) Amirou, Siham; Zerizer, A.; Pizzi, A.; Haddadou, Imane; Zhou, X.
Date palm biomass is a renewable natural resource that has not widely been utilized in industry. The objective of this study was to examine some chemical properties of date palm trunk and rachis (holocellulose, cellulose, lignin and extractives) and to evaluate their suitability to produce composite panels. Particleboards were produced using trunk and rachis as an alternative raw material for forest products industry in the presence of two types of polycondensation resins (phenol–formaldehyde and melamine urea–formaldehyde) which were selected as binding agents. The panels were tested for their physical (water absorption and thickness swelling) and mechanical (modulus of rupture, modulus of elasticity and internal bond strength) properties. The internal bond strength of date palm trunk and date palm rachis based boards met the requirements of the general purpose product standards (EN 312) at 0.70 g/cm3 density. The panels made with phenol–formaldehyde resin showed better performance with respect to the panels made with melamine urea–formaldehyde. In addition, the particleboard made with date palm trunk particles had better quality compared to the particleboard made from date palm rachis particles. Based on preliminary results of this work, raw materials from date palm trunks and rachis can have a promising potential in the manufacture of particleboards and as a substitute for wood in board production
Resistance to crack propagation of Algerian wood
(2011) Kennouche, S.; Zerizer, A.; Aknouche, A.; Daoui, Abdelhakim
Wood is the most building materials widely used since prehistory for the construction of houses, tools, weapons. Accidents occurring during the use of materials caused by different defaults, as: knots, resin pockets, cracks. These various defaults and others are the starting point of the principle of crack mechanics. Our present work focuses on determining the resistance to crack propagation of three types of Algerians wood, (Aleppo pine, eucalyptus and oak), by calculating the energy release rate G (mode I). The estimation of factor G allows the possibility of fracture propagation
Thermal behaviour of five different date palm residues of algeria by thermogravimetric analysis
(PRO LIGNO, 2013) Amirou, Siham; Haddadou, Imane; Zerizer, A.
Renewable energy has become more important globally especially with the current fuel and economic crisis. Date palm biomasses are highly potential materials for energy resources. The fact that they are renewable and abundantly available are amongst the attractive reasons of employing them as the major source for renewable energy. The purpose of this research was to investigate the thermal behavior of date palm biomass in order to evaluate their usefulness for energy production. In microparticular scale, the thermogravimetric analysis (TGA) is one of the techniques used to determine the thermal properties of five different date palm residues that were studied: (date palm rachis (DPR), date palm trunk (DPT), leaf base (Petiole) (LB), fruitstalk prunings (FP) and liff (LP)). The TGA technique consists to record the lost weight during the increase in temperature from 20°C until 600°C with a 10°C/min heating rate. The thermograms presented a departure phase of free water (from room temperature to 110°C) before the degradation process of the lignocellulosic constituents. The lignin and hemicellulose play an important role on the degradation of lignocellulosic materials at the temperature under 250°C. The degradation of cellulose begins at 250°C and overlaps to that of lignin until 450°C
Tool wear effect on cutting forces : in routing process of aleppo pine wood
(2009) Aknouche, Hamid; Outahyon, A.; Nouveau, C.; Marchal, R.; Zerizer, A.; Butaud, J.C.
This paper uses the cutting forces in a routing process of Aleppo pine wood to estimate the tool wear effect. The aim is to obtain further information about the tool wear effect by monitoring the variation in the cutting forces. A Kistler 9257A 3 axes Dynamometer was positioned under the workpiece to measure the cutting forces at frequencies up to 10,000 Hz. The experiments were carried out on a CNC routing machine RECORD1 of SCM. A carbide tool was used and the cutting parameters were fixed. The cutting speed was approximately 25 m/s. Dasylab software was used to capture the data. The results show a correlation between the tool wear and the computed angle ( ), between the tangential and cutting forces. In fact, the variation of ( ) is unstable in the running period and stable in the linear wear zone, included in the interval [−1.11◦; −1.10◦]. This study was performed as part of a development program for the Algerian wood industry, hence the selection Aleppo pine wood as the working material
Traceability in wood production
(2013) Zerizer, A.; Nacereddine, H.; Aknouche, Hamid
Use of wood waste (Aleppo pine) as a superplasticiser in self-compacting mortars
(2014) Daoui, Abdelhakim; Safi, Brahim; Rezak, M.; Zerizer, A.
Utilization of Hydrophilic/Hydrophobic hyperbranched poly(amidoamine)s as additives for melamine urea formaldehyde adhesives
(Wiley, 2015) Amirou, Siham; Zhang, Jizhi; Essawy, H. A.; Pizzi, A.; Zerizer, A.; Li, J.; Delmotte, L.