Publications Internationales
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Item An ecological water‑based drilling mud (WBM) with low cost: substitution of polymers by wood wastes(Springer, 2019) Haider, Soumia; Messaoud‑Boureghda, Mohamed‑Zine; Aknouche, Hamid; Akkouche, Ali; Hammadi, Larbi; Safi, BrahimAn ecologically friendly water-based drilling mud (WBM) was designed by using wood wastes (WP: wood powder) in order to substitute the organic polymers which are very expensive and often make the higher cost of the oil well drilling. This present work is dedicated on studying the rheological behavior and main rheological properties of WBM containing the wood powder at different contents and sizes by substitution of usually used polymers. The effect of wood powder on the drilling fluid filtrate was also analyzed. The drilling fluid that was developed has better rheological properties and fluid loss control which are required for a good functioning of oil well drilling. By a total substitution of polymers, the wood powder (300 μm at 850 kg/m3) can be used as a filtrate reducer of mud because the WBM filtrate obtained exhibits a minimum and having requested values for such formationItem Study of Physico Mechanical and Rheological Behavior of Self Compacting Concrete" (SCC), with and without Fibers under the Action of Various Types of Superplasticizers(2012) Samar, Madjid; Benmounah, A.; Kheribet, Rabia; Saidi, Mohammed; Safi, BrahimItem Study of the behaviour of mortars based of cements composed toward the attacks of acids waters(2011) Driss, Miloud; Hamadouche, Mohamed Amine; Kerbouche, Abdelkader; Oumrani, Nasereddine; Safi, BrahimItem Optimization of the process of cooking and drying of brick(isjaee, 2010) Saidi, Mohammed; Hamiane, Messaoud; Benmounah, A.; Safi, BrahimThe construction materials play an enormous part in the economy of the country; this industry comprises a very varied range of products going of simple pottery passing by brick of construction until the technical porcelain and the industry of cements. As, this production takes a so important rise as the realization of manufacturing plant becomes a daily reality. This realization of quite quantitative factory that qualitative depends on the availability of a raw material of quality, means of production in good knowledge and operating condition to make allowing a perfect control of the process. Considering, the enormous part which plays the construction materials in particular the bricks of construction in the economy of the country. We were interested to make a study concerning the production unit of bricks of Boudouaou (east of Algeria) on the technological, thermal and economic level since the essential study is made on the thermal part in order to calculate the acceptable mode of cooking and to calculate the combustion of gas. The study of the heat balance enables us to know how calculations can be carried out and of knowing how and the energies brought to the furnace spent are consumed. This study enabled us to make a saving in gas in the order of 63.5 m³/h and to make a profit of energy of 266.37 kJ/kg of product and to obtain a better use of the drier and furnace with a possible maximum thermal efficiencyItem 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 Mechanical behavior and chemical durability of marble-based mortar: Application to panels subjected to punching(Elsevier, 2019) Chahour, Kahina; Safi, BrahimThe main purpose of this paper is to use marble as sand in the mortar composition and to study the impact of natural sand replacement on mortar properties, such as mechanical strength, rheology and durability of different mortar mixtures at different curing ages up to 56 days. Natural sand (NS) was substituted by marble sand at different percentages (0%, 30%, 50%, 70% and 100% by weight of NS). The fresh property (workability), hardened properties (compressive, flexural and punching strength), compactness (ultrasonic wave speed) and durability (acid and water resistance) of the mortars studied were evaluated. A complementary study on mechanical behavior of panels elaborated with the studied mortars has been conducted; the test results have shown that mortar with 50% and 100% of substitution rate give better results for compactness, compressive and flexural strength. The punching strength obtained by the punching shear test has been significantly improved by the increase of natural sand substitution rate. However, panels carried out marble-based mortars with 70% of marble sand have given a punching strength similar to that obtained by control mortar panel (100% natural sand). This result has been also proven by the improvement of the mechanical behavior of slab made with 100% marble mortar. Results of durability estimated by acid attack have shown that loss in weight of mortar mixtures decreases with the increase of the percentage marble sand. Whereas, beyond 50% of marble sand content, water permeability increases compared to that of mortar controlItem Effet du dosage et de la repartition des fibres Metalliques sur le comportement mecanique en flexion Des mortiers autoplacants fibres(2019) Kheddache, Lynda; Chahour, Kahina; Safi, BrahimCe travail décrit l'influence du dosage et la répartition des fibres métalliques sur le comportement en traction par flexion des mortiers autoplaçants fibrés. Des essais de flexion trois points ont été réalisés sur des éprouvettes prismatiques de dimensions 40x40x160 mm à l'âge de 28 jours, en faisant varier la quantité (20, 30 et 40 kg/m3) et la répartition des fibres métalliques. Les résultats obtenus ont montré que la résistance à la traction par flexion est d'autant plus importante que le dosage en fibres est important. Par ailleurs, l'effet de la répartition des fibres a été mis en évidence, puisque un gain de la résistance allant jusqu'à 50 % a été obtenu, comparé au mortier autoplaçant sans fibresItem 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 Performance of Self-Compacting mortars containing foam glass granulate(2015) Safi, Brahim; Aboutaleb, Djamila; Saidi, Mohammed; Benmounah, Abdelbaki; Benbrahim, FahimaItem 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)