Browsing by Author "Aboutaleb, Djamila"
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Item Annealing effect on copper-doped sodo-borate glasses (na2o-4b2o3)(2023) Aboutaleb, Djamila; Safi, BrahimThe annealing effect of an alkalino-borate type glass below the softening temperature was investigated accord ing to the Na2O-B2O3 binary system. Doping of the samples was done by the introduction of copper oxide "CuO" according to different levels. The properties of elaborate glasses before and after annealing have been studied. DRX diffraction, optical spectroscopy and infrared analysis were used to complete this study. The obtained results show that the annealing heat treatment affects the structure of these glasses by redistributing the structural units, partially correcting the defects and reinforcing them of the structure. It has been noticed that the BO3 units are reformed again and the BO4 have decreased, which has led to an increase in the coefficient of thermal expansion, a decrease in the diffraction index and optical dispersion, a drop in mechanical prop erties, thermal conductivity and electrical permittivity.Item Effect of alkalinity and the nature of the basic solution [Ca(OH)2 and Ba(OH)2] on the zeta potential and rheological properties of the drilling mud(2013) Maallem, M.; Safi, Brahim; Saidi, M.; Benmounah, A.; Aboutaleb, DjamilaItem Effect of calcined silt on the rheological behavior of cement pastes of the self compacting concrete SCC(European Journals Inc, 2010) Safi, Brahim; Benmounah, Abdelbaki; Saidi, Mohammad Said; Aboutaleb, DjamilaItem Effect of isothermal heat treatment time on structural transformation and crystallization of B2O3-PbO glass(2008) Aboutaleb, Djamila; Iratni, A.; Safi, BrahimLead borate glass was prepared by the quench method, followed by treatment at its isothermal temperature at different time periods. When the sample was rapidly cooled from the melt, it showed two distinguished opalescent layers. The SEM analysis and XRD pattern provide characteristics of glass without XRD peaks and their morphology show the aggregated spherical particles in the phase separated glass. This data show that phase separation occurred even when the melts were rapidly cooled, however, the sample shows a Ostwald ripen with increasing time of heat treatment, which implies that the size of particles increases and their number decreases. When changing the sample's composition by adding lead oxide (PbO), the sample crystallizes directly upon heat treatment. The infrared absorption spectra show shift edge for sample glass with heat treatment, which indicates a change of structural configuration, i.e. conversion of tetrahedral boron on triangular boron coordinationItem Effect of the AL2O3 and BaO addition on the thermal and physical properties of ternary glass system (B2O3- BaO-AL2O3)(DAVID PUBLISHING, 2013) Aboutaleb, Djamila; Safi, Brahim; Ayadi, A.; Iratni, A.In borate glasses, the main structural units are the [BO3] triangles and [BO4] tetradral which form different superstructural units like; boroxol rings, metaborate rings and chains, pentaborate, diborate, triborate and pyroborate. In this work, the Barium aluminoborate glasses were prepared. Some of properties were investigated by measure like density and chemical durability and the other by calculs. The dilatometric curves were determined and they revealed that the temperature of transition (Tg) and softening (Ts) and the dilatation coefficient increase by addition of Al2O3 and BaO contentItem Effect of the heat curing on strength development of self-compacting mortars containing calcined silt of dams and ground brick waste(2013) Safi, Brahim; Ghernouti, Y.; Rabehi, B.; Aboutaleb, DjamilaThe strength development of self-compacting mortars (SCM) containing calcined silt (CS) and ground brick waste (GWB) was investigated. The variables are the nature of addition (CS and GWB) in the binder and the heat curing at different temperatures (20 ºC and 60 ºC) at 7 and 14 days of curing. Two temperatures 20 and 60 ºC were applied to samples with intermediate levels (depending on the drying method applied to precast) for 18 hours in total. In this study, a Portland cement (CEMII), Calcined silt (750 ºC for 5 hours), ground waste brick, were used in the binders of SCM. The results show that the compressive strength to 14 days of mortars, increases with annealing (60 ºC) compared to that measured at 20 ºC. Also, values of compressive strength of mortars at 14 days that are close to those obtained without 28 days curing treatment. Indeed, a strength gain of about 20.5% and 27.3% was obtained respectively for the SCM with GWB and the SCM with CS. However, a small change in mass recorded for both types of mortarsItem Elaboration et caractérisation des verres thermorésistants borosilicates(2002) Aboutaleb, DjamilaL'élaboration des verres alcalino-borates et borosilicates à été faite à partir du sable local (sable du Chlefde Sidi Bou-Ali) et d'autres matières premières; Les différents résultats obtenus par les méthodes pratiques et les calculs théoriques ont été comparés ensuiteItem Etude de la séparation des phases dans des verres borates et borosilicates(2012) Aboutaleb, DjamilaDans ce travail, on a étudié la séparation des phases dans deux systèmes vitreux;le premier système est un système binaire de borate au plomb (B2O3-PbO) ou on a discuté le changement de la structure au cours du traitement isothermique de recuisson. D’abord l’élaboration initiale du verre a donné un verre opale présentant une séparation de phase par nucléation de nature stable, cette dernière s’est développée avec le temps de recuisson en un mûrissement d'Ostwald (cristallisation par le mécanisme de germination et croissances) le deuxième système est le système ternaire borosilicate de sodium (SiO2-B2O3-Na2O) qui est un système présentant une lacune d'immiscibilité intéressante pour la fabrication du verre Vycor® dont quatre compositions chimiques ont été choisies prés de la ligne optimale de la fabrication de ce verre. l'immiscibilité dans ce système Sodoborosilicate a un aspect interconnecté. Après l’élaboration des échantillons, on a calculé et déterminé quelques propriétés avant et après la démixtion, on a constaté le renforcement des liaisons M-0-M (diminution des oxygènes non pontants) due à la variation de concentration des ions de sodium ce qui entraîne une amélioration des propriétés mécaniques, thermiques et optiques. L’étude de la profondeur de la couche lixiviée à travers la concentration deB2O3 extraite a été faite au cours de l’évolution de la lixiviation engendrant la production d’un verre microporeux borosilicaté (SBN3C) présentant une structure interconnectée. La consolidation de ce verre à 1000°C a donné un verre avec de bonnes propriétés. La zone d’immiscibilité a été déterminée par calcul dans le système ternaire borosilicate de sodiumItem Granulated foam glass based on mineral wastes used for building materials(SAGE, 2017) Chahour, Kahina; Aboutaleb, Djamila; Safi, Brahim; Mazari, Tassadit; Zeghad, MohamedItem Lithium oxide effect on the thermal and physical properties of the ternary system glasses (Li2O3-B2O3-Al2O3)(2015) Aboutaleb, Djamila; Safi, BrahimThe borate glasses are known by their structural characterized by existence of unit’s structural composed by triangles and tetrahedrons boron in different configurations depending on the percentage of B2O3 in the glass chemical composition. In this paper, effect of lithium oxide addition on the thermal and physical properties of an alumina borate glass, was investigated. It was found that the boron abnormality has a significant effect in the change of glass properties according to the addition rate of lithium oxideItem Ostwald ripening phenomena in B 2O 3-PbO glass system(2010) Aboutaleb, Djamila; Iratni, A.; Safi, BrahimItem Ostwald Ripening Phenomena in B2O3-PbO Glass System(2009) Aboutaleb, Djamila; Iratni, Aicha; Safi, BrahimLead borate glass was prepared by the quench method, followed by treatment at its isothermal temperature at different time periods. When the sample was rapidly cooled from the melt, it showed two distinguished opalescent layers. The SEM analysis and XRD pattern provide characteristics of glass without XRD peaks and their morphology show the aggregated spherical particles in the phase separated glass. This data show that phase separation occurred even when the melts were rapidly cooled. However, the sample shows a Ostwald ripen with increasing time of heat treatment, which implies that the size of particles increases and their number decreases. The infrared absorption spectra show shift edge for sample glass with heat treatment, which indicates a change of structural configuration, i.e. conversion of tetrahedral boron on triangular boron coordinationItem Performance of Self-Compacting mortars containing foam glass granulate(2015) Safi, Brahim; Aboutaleb, Djamila; Saidi, Mohammed; Benmounah, Abdelbaki; Benbrahim, FahimaItem Phase separation and chemical durability in the SiO2-B2O3-Na2O (SBN) glass system(2012) Aboutaleb, Djamila; Safi, Brahim; Jbara, O.; Iratni, A.; Douglad, J.Sodium borosilicates glasses were treated isothermically several times. In present work, the effect of phase separation on chemical durability and the electric resistivity was investigated. In addition, the effect of chemical composition and addition of calcium on the kinetics and rate of leaching of these glass materials in hydrochloric acid (3M HCl) was also investigated. The system studied exhibited phase separation starting from 550 ºC. Present results showed that the chemical durability was weakened upon phase separation. On the other hand, chemical durability increased with increasing SiO2 content and reducing the alkaline oxides (Na2O) content. Results also showed a drastic decrease in the ionic electric conductivity (increase in resistivity) with decreasing C = (Na2O + B2O3)/SiO2 (reduction of Na2O). The effect of chemical composition on the rate of leaching showed that boron and sodium are dissolved much more quickly than silicon. The greater the content of Na2O and B2O3 in glass, the more soluble the glass becomes. However, addition of silica results a decrease in glass solubility. These results indicate that substitution of sodium by calcium induces an acceleration of the kinetics of deteriorationItem Preparation And Characterization Of B2o3- Bao-al2o3 (bba) Glass System(Research Unit Materials, Processes and Environment/Faculty of Science and Engineering, Boumerdes University, Boumerdes, Algeria, 2013) Aboutaleb, Djamila; Safi, B.; Benhaoua, F.n borateglasses, the main structural units are the [BO3] triangles and [BO4] tetradral which form different superstructural units like; boroxol rings, metaborate rings and chains, pentaborate, diborate, triborate and pyroborate. In this work, the Barium aluminoborate glasses were prepared. Some of properties were investigated by measure like density and chemical durability and the other by calculs. The dilatometric curves were determined and they revealed that the temperature of transition (Tg) and softening (Ts) and the dilatation coefficient increase by addition of Al2O3and BaO content.Item Séparation Des Phases Dans Le Système sio2- B2O3- Na2O (ISBN)(2009) Aboutaleb, Djamila; Iratni, A.; Safi, Brahim; Douglad, J.Item Simulation of immiscibility regions in sodium borosilicate glasses(2014) Aboutaleb, Djamila; Safi, BrahimIn this paper, sodium borosilicates glasses were prepared by melting in air. These heat-resistant transparent glasses have subjected subsequently isothermal treatments at different times, which have transformed them at opaque glass (milky white color). Such changes indicate that these glasses showed clearly phase separation (immiscibility). The immiscibility region in a sodium borosilicate ternary system was investigated in this work, ie to determine the regions from which some compositions can show phase separation. For this we went through the conditions of thermodynamic equilibrium, which were translated later by mathematical equations to find an approximate solution. The latter has been translated in a simulation which was established thereafter to find the immiscibility regions in this type of special glassesItem The use of plastic waste as fine aggregate in the self-compacting mortars : effect on physical and mechanical properties(Elsevier, 2013) Safi, Brahim; Saidi, M.; Aboutaleb, Djamila; Maallem, M.This work aims to study the possibility of recycling waste plastic (polyethylene terephthalate (PET) used for the bags manufacture) as a fine aggregate instead of sand in the manufacturing of the self-compacting mortars. For this, an experimental study was carried out to evaluate physical and mechanical properties of the self-compacting mortars (SCMs) with plastic wastes. The sand is substituted with the plastic waste at dosages (0%, 10%, 20%, 30% and 50% by weight of the sand).The physical (bulk density, porosity, water absorption and ultrasonic pulse velocity testing) and mechanical (bulk compressive and flexural strength) properties of SCMs were evaluated and a complementary study on micro-structural of the interface of cementitious matrix and plastic waste. The measurements of physical and mechanical properties show that, in term of the density for materials, the mortars with 50% of plastic waste give better results than other proportion of the waste. Those mortars have a mechanical strength acceptable for lightweight materials. According to results obtained a reduction of 15% and 33% for mortar containing 20–50% plastic waste. A microscopic study of the interfacial zone (plastic–binder) has shown that there is an adhesion between plastic and cement paste (case 28 days of hydration)Item Use of refractory bricks as sand replacement in self-compacting mortar(Taylor & Francis Online, 2017) Aboutaleb, Djamila; Safi, Brahim; Chahour, Kahina; Belaid, AmraneThis present work investigate the possibility of using refractory bricks (RB) as fine aggregates (by partial and total substitution of natural sand) in self-compacting mortars (SMCs). For this, an experimental study was carried out to evaluate physical and mechanical properties ((bulk density, compressive and flexural strength) of the self-compacting mortars (SCMs) with partial and total substitution of natural sand (NS) by crushed refractory bricks (RB) at different ratio (BR/S= 0, 10, 30, 50 et 100%) by weight. The results obtained show that the RB (0/5 mm class), can be used as fine aggregates for self-compacting mortar, without affecting the essential properties of mortar. However, the performances of RB-based mortar (100% as sand), were better and are suitable for a fluid concrete (such as self- compacting concrete)Item Using the ground brik waste and the silt of dams in self-compacting concrete : effect on the physical and mechnical properties(2013) Safi, Brahim; Aboutaleb, Djamila; Ghernouti, Y.; Rabehi, B.