Publications Scientifiques
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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 Influence of superplasticizer doped by Nano-silica on the rheological and mechanical properties of cement mortars(2019) Daoui, Abdelhakim; Safi, Brahim; Zerizer, AbdellatifPrevious research indicates that the inclusion of nanosilica (NS) modifies the properties of the fresh and hardened state, compared to the traditional mineral additions. Some authors estimate that the appropriate percentage of Nano-silica should be small because of difficulties caused by agglomeration to particles during mixing, while others indicate that 10% by weight, if adjustments are made to the formulation to avoid an excess of self-drying and micro cracks that could impede strength. For this purpose, the present work aim to see the effect of the introduction mode of the nanosilica on the rheological and physic mechanical properties of cement mortars. In this study, NS was used either powdered with cement or in solution with the superplasticizer (Superplasticizer doped in nanosilicafigure (a)). Results show that the use of nanosilica powder (replacing cement on the one hand) has a negative influence on the rheological parameters and the rheological behavior of cementitious pastes. However, the introduction of nanosilica in solution in thesuperplasticizer (SP) was significantly improved the rheological parameters and the rheological behavior of cementitious pastes. Indeed, more the dosage of NS-doped SP increases more the shear stress and viscosities of the cementitious pastes become more fluid and manageable. A significant reduction of shear stress and plastic viscosity were observed that due to the increase in superplasticizer. A dosage of 1.5% NS-doped SP gave adequate fluidity and the shear rate was lower.Item Strength development of fiber reinforced selfcompacting concrete (RFSCC): Temperature effect on mechanical properties(2014) Safi, BrahimThe strength development of Fiber Reinforced Self-Compacting Concrete (FRSCC) was investigated in this work. The variable is the heat curing at different temperatures (20°C and 60°C) applied at 7 and 14 days of curing of concretes studied. Two temperatures 20 and 60 °C were applied to samples with intermediate levels (depending on the drying method applied to precast concrete) for 18 hours in total. In this study, a Portland cement (CEMII), limestone fillers were used in the binders of FRSCC and the steel fibers are also used as reinforcement for concrete. The results show that the compressive strength to 14 days of concretes studied, increases with heating (60 °C) compared to that measured at 20 °C. Also, values of compressive strength of FRSCC at 14 days that are best to those obtained without 28 days curing treatment. Indeed, the compressive strength values of treated concretes (14jours) obtained are 15% and 25% respectively obtained for fibers reinforced self-compacting concretes made with 1.5% of steel fibersItem Influence of polycarboxylate superplasticizer on hydration and rheological properties of cement pastes containing different cements(2014) Oubraham, Chahrazed; Benmounah, A.; Samar, Mohamed Faouzi; Safi, BrahimItem Behavior of mortars hydraulic and organic matrix in aggressive environments(2013) Saidi, Mohammed; Safi, Brahim; Samar, Mohamed Faouzi; Benmounah, A.; Hamiane, MessaoudItem Comportement rhéologique et physico-mécanique des ciments composés (CEMII/A) en présence d'un nouvel adjuvant superplastifiant (AETERNUM-1) dans les milieux agressifs(2012) Benmounah, A.; Kheribet, Rabia; Safi, Brahim; Saidi, MohammedItem 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 Caractérisation rhéologique des fluides de forage à base d’eau, en présence d’un inhibiteur de gonflement(2010) Safi, Brahim; Benmounah, A.; Gueciouer, Abderazak; Samar, Mohamed FaouziL’objectif de ce travail sera la mise au point de formulations de fluides de forage à base d’eau, optimisées avec l’ajout d’un inhibiteur de gonflement, destiné pour le forage de la phase 8" 3/8. Pour ce, nous avons d’abord élaboré différents systèmes à base de chlorure de potassium (KCl) et de polymère (PHPA) qui diminueront le gonflement des argiles tout en respectant les exigences environnementales. Ensuite, nous avons étudié le comportement rhéologique (viscosité plastique et yield-value) de chaque élément de la formulation en les soumettant aux effets de la température, de la salinité et de l’alcalinité, avant d’aboutir enfin à la formulation finale qui sera soumise ensuite à des tests standards, selon les normes API. Les résultats obtenus montrent une diminution significative du gonflement et la formulation retenue présente des caractéristiques physico-chimiques satisfaisantes ainsi qu’un comportement rhéologique rhéofluidifiant proche du modèle de Hershel Bulkley