Browsing by Author "Benmounah, Abdelbaki"

Now showing 1 - 20 of 34

Comparative studies of the rheological behavior and microstructural properties of emulsions (oil/distilled water phase) and (oil/Lias water phase)
(Taylor and Francis, 2018) Djemiat, Djamal Eddine; Safri, Abdelhamid; Benmounah, Abdelbaki
The rheological behavior of crude oil and their emulsions were investigated as a function of two water types (distilled water and the LIAS water). The focus of this work is to obtain more knowledge about the effect of LIAS water concentration, which used to maintain pressure and produced from production of crude oil in the oil fields Tin Fouye Tabankort-south Algeria, on the rheological properties of crude oil. The rheological parameters were measured by using AR-2000 rheometer at 15 °C under dynamic and shear testing conditions. The measured data were first classified into two groups for Newtonian and non-Newtonian fluids. Depends on the type and concentration of water, the non-Newtonian behavior was described in better way by the Casson, Power law and the Herschel–Bulkley models. The results indicated that the viscosity, the yield stress, the elastic modulus, (G′), the loss modulus, (G″), and the microstructure of the prepared emulsions not only varied with water concentration but also by water types.
Comparative study of biopolymers action on physico-chemical and rheological properties of water-based drilling muds
(Chemical Publishing, 2014) Bentriou, Abdelhak; Fourar, Karim; Benmounah, Abdelbaki; Safi, Brahim
Effect of anionic polyelectrolytes on the flow of activated sodium bentonite drilling mud
(EDP Sciences, 2018) Chalah, Kaci; Benmounah, Abdelbaki; Benyounes, Khaled
Bentonite is often used in water-based drilling fluids. The xanthan gum is widely used as to increase the viscosity of the bentonite suspension. For the stabilization of the drilled layers, we use filtrate reducers: sodium carboxymethylcellulose low viscosity and cellulose polyanionic low viscosity. The objective of this work is to explain the effect of the polymers on the rheological behavior of the 5% bentonite suspensions. These results will provide practical recommendations for the rational use of different types of additives in water-based drilling muds. Our work is based on rheological trials on a viscometer. The results obtained on the bentonite 5%-xanthane suspension show a rheofluidifying behavior with yield stress conform to the Herschel-bulckly modal. While increasing the concentration of filtrate reducer decreases the yield stress and reduces the viscosity. The effect of CMC LV is more pronounced than PAC L
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, Djamila
Effect of concentration and temperature on the rheological behavior of hydroxylethyl cellulose solutions
(2022) Remli, Samia; Benyounes, Khaled; Benmounah, Abdelbaki
The knowledge of the rheological properties of polymers makes their use interesting in various fields of applications, such as food industry, cosmetics, enhanced oil recovery or construction materials. Whatever the application, the effect of temperature and concentration on these properties is of great importance. This study covered a wide range of concentrations from 0.2 w/% to 1 w/%, and temperatures from 10 °C to 80 °C. The results obtained provide interesting information regarding the effects of the temperature and concentration of the aqueous solutions of the polymer since they reveal that the rheological properties remained practically unchanged in the temperature range considered. The impacts of shear rate, temperature and concentration on the flow behavior were analyzed. Small-amplitude oscillatory shear measurements were performed, and the results obtained show that the apparent viscosity is strongly influenced by the concentration of the aqueous solution of HEC, exhibiting a marked non-Newtonian shear-thinning behavior at different temperatures. The flow behavior is well described by several rheological models. The effect of temperature on the kinematic viscosity was fitted with the Arrhenius model; the behavior of this model in relation to experimental viscosity values was suitable and the linear fit showed good regression coefficients. The dynamic state was well described with the generalized Maxwell model
The effect of inhibiting molybdate used in anodizing-conversion treatment to improve corrosion protection of AA2030 aluminum alloy in different steps
(Springer, 2022) Benmohamed, Manel; Benmounah, Abdelbaki; Haddad, Ahmed; Yahi, Sarah
In this article, different treatment baths for corrosion protection of 2030 aluminum alloy in addition to replacing the hexavalent chromium due to the European recom- mendation were employed. This work is divided into three steps of treatment: first, anodization using molybdate inhibitor without and with phosphoric acid and, then, pre-oxidation with sodium hydroxide. In the last step, we studied the influence of conversion coating with the combination of sodium molybdate and fluoride on the anodic layer formed on aluminum alloy 2030. In order to characterize the formed lay- ers, we use microstructural characterization (SEM, AFM, and nano-indentation), which allows highlighting the surface condition as well as the morphological distribution, and electrochemical techniques such as potentiodynamic polarization and electro- chemical impedance spectroscopy which shows that the anodization treatment of the aluminum alloy with phosphoric acid and sodium molybdate offered better corrosion resistance. This resistance increased with the use of pre-oxidation and then reached a maximum value of 99.8% efficiency with the addition of the molybdate conversion coating which causes an increase in the double layer and gave an alternative possibility of chromium VI
Effects of calcined halloysite nano-clay on the mechanical properties and microstructure of low-clinker cement mortar
(Elsevier, 2018) Allalou, Sara; Kheribet, Rabia; Benmounah, Abdelbaki
This paper explores the effects of calcined halloysite nano-clay (CHNC) on the physico-mechanical properties and microstructure of high volume slag (HVS) cement mortar. The principal objective of this research is to constitute a low-clinker cement mortar with high mechanical properties. Ordinary Portland cement clinker blended with 70% of ground granulated blast furnace slag (GBFS) was partially substituted with CHNC in ratios of 0%, 1%, 2%, 3%, 4%, 5% and 6% by weight. The results showed that the early age and long-term mechanical strengths of the slag cement mortars were significantly improved by the presence of CHNC. The slag cement containing 5 mass % of CHNC possessed the highest improvement of the mechanical properties and microstructure of hardened cement pastes and mortars. It was suggested that the higher pozzolanic activity of CHNC particles and the nucleation of calcium hydrosilicate (C–S–H) caused the enhanced strength development
Effects of temperature on the time responses of strontium aluminates
(Elsevier, 2021) Fouzar, Samia; Eftimov, Tinko; Kostova, Irena; Benmounah, Abdelbaki; Lakhssassi, Ahmed
In this paper we study the effect of temperature on the rise and decay time responses of Eu and Eu, Dy doped strontium aluminates. Normalized switch on and switch off time responses are used to estimate the share of phosphorescence in the observed luminescence. The parameters of the power law time responses related to the relative share of phosphorescence in luminescence and to the rise/decay rates are found to be strongly temperature dependent. The results show that unlike luminescence intensity, the overall efficiency of phosphorescence increases strongly with temperature and reaches a maximum around 65 °C. Thе maximum correlates with the activation energy of the samples and depends on their doping and fabrication technology
Etude comparative des parametres rhéologiques et physico-mécaniques des coulis de ciment avec ajout de pouzzolanes naturelles et fumée de silice en présence de superplastifiant
(2015) Oubraham, Chahrazad; Benmounah, Abdelbaki
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, Abdelghani
Les 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'avion
Excitation and spectral dependence of the rise and decay time responses of Eu2+- and Dy3+-doped strontium aluminates
(Springer, 2022) Fouzar, Samia; Kostova, Irena; Eftimov, Tinko; Benmounah, Abdelbaki; Ouchabane, Mohammed; Lakhssassi, Ahmed
In this paper, we study the phosphorescence rise and decay time responses of Eu2+- and Dy3+-doped strontium aluminates prepared by different methods after scanning them with a narrow spectral width (15 nm FWHM) light from a monochromator. The experiments performed show that the time responses essentially depend on the excitation duration as well as on the excitation and the emission wavelengths. It has been found that at the excitation wavelength of maximum efficiency λ′max, a ‘fast track’ rise and decay of the phosphorescence exists. We suggest that by studying the normalized switch on and switch off time responses, we can determine the relative share of slow phosphorescence afterglow with respect to fast and slow phosphorescence decay as well as the rate of luminescence rise and decay processes. The relation to the synthesis technology and to the contents of the samples is discussed
Experimental investigation of the rheological behavior of algerian crude oils from the quagmires
(Taylor & Francis, 2019) Souas, Farid; Safri, Abdelhamid; Benmounah, Abdelbaki
Experimental study of environmentally Friendly composite materials Behavior in aeronautical applications
(2019) Basaid, Djamel; Benmounah, Abdelbaki; Aribi, Chouaib
This study is a part of a work in progress on the mechanical behavior of laminate in various modified epoxy matrices. we begin with a laminate six folds with fiberglass taffeta, and epoxy matrix cross linked by aliphatic Amine called MEDAPOXY STR, this resin is in the form of a kit of two elements ,a monomer and a hardener with the report weight of 0,67%. The treatment of the results shows that the reticulation of monomer by this Amine is incomplete what provokes a plastic domain on the mechanical behavior of the matrix, concerning composites made from these elements, the results show that the elastic domain is dependent on the elasticity of fibers used and not on the matrix. The control by ultrasound can be considered as another way to measure and follow-up of the parameters elasticity of the elaborate laminate
Improved behaviour of mortars at a high temperature by using refractory brick wastes
(Indersciences Publishers, 2015) Saidi, Mohammed; Safi, Brahim; Bouali, Khaled; Samar, Madjid; Benmounah, Abdelbaki
Improvement of rheological properties of Algeria crude oil by addition of extra-light crude oil and a surfactant agent
(Taylor and Francis Online, 2018) Djemiat, Djamal Eddine; Safri, Abdelhamid; Benmounah, Abdelbaki
Effect of surfactant and extra-light crude oil addition on the rheologicalbehaviors of an Algeria crude oil in order to improving its flowability werestudied at low temperature. These rheological properties include steadyflow behavior, yield stress and viscoelastic behavior. An AR-2000 rheometerwas employed in all of the rheological examination tests. Results showthat Toluene and extra-light crude oil addition causes a strong reductionin viscosity, the yield stress and can effectively increase of crude oil trans-port capacity. The toluene addition gets its best flow capacity and lowestviscosity at 6%. The extra-light crude oil addition obtains its best flow cap-acity and lowest viscosity at 50%. The viscoelasticity character of the crudeoil has indicate a significantly influence by the addition of Toluene andextra-light crude oil.
Influence of nanosilica and a polycarboxylate superplasticizer on the pheological and electrokinetical properties of cement pastes
(Academic Journals, 2014) Samar, Madjid; Benmounah, Abdelbaki; Safi, Brahim; Kheribet, Rabia; Saidi, Mohammed
The effect of individual and combined addition of both nanosilica (NS) and polycarboxlate ether plasticizer (PCE) admixtures on cements pastes was studied. the sole incorporation of NS increased the water demand, as proved by the mini-spread flow test…
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, Abdelbaki
A novel spherical hybrid material based on the combination of humic acid/alginate/Algerian Zeen Oak sawdust for removing chromium (VI) from wastewater
(Elsevier, 2023) Sadoun, Louiza; Benmounah, Abdelbaki; Ait-Ramdane-Terbouche, Chafia; Seffah, Karima; Terbouche, Achour
A novel spherical hybrid material designed from the combination of humic acid (HA), sodium alginate (Al) and sawdust derived from Algerian Zeen Oak Waste (OS) has been prepared. After optimization of HA/Al/OS mass ratio, the structure of the synthesized hybrid spheres was established using various characterization techniques notably ATR, SEM-EDX, XRD, BET and the point of zero charge (pHpzc). Adsorption tests using this compound were applied to remove chromium(Cr (VI)) from aqueous solutions. The influence of the different parameters such as contact time, pH, temperature, initial metal concentration, and mass of the material were studied. The obtained results revealed that the mass of HA had a significant influence on the formation of the spheres. By varying the ratio of HA/Al/OS (1/16/16 (S1), 1/5/5 (S2), 1/3/3 (S3) and 1/2/2 (S4)), the humic acid allowed a good coating of the hybrid material. The ratio 1/5/5 (S2) was retained for the adsorption study. The efficiency of this material was subsequently tested for the removal of Cr (VI) from aqueous solutions. Optimizing the different experimental parameters allowed to obtain a removal efficiency of over 90 % for an initial Cr (VI) concentration of 60 mg L−1, at pH = 2 and temperature of 353.15 K, using 0.1 g of material. The kinetic study showed that the process of elimination of Cr (VI) followed the pseudo-second order model and well fitted with the Freundlich adsorption isotherm model with R2 value of 0.99 and a low value of χ2 (2.88). A maximum adsorption capacity of 50.328 mg.g−1 was determined by the Langmuir isotherm model. The hybrid spheres showed good regeneration efficiency even after four adsorption-desorption cycles. The thermodynamic study (ΔS = 0.091 kJ mol−1 K−1, ΔH = 24.427 kJ mol−1 and ΔG° = −2.883 kJ mol−1 at 298.15 K) revealed that the adsorption process was spontaneous, favorable and endothermic with a physisorption phenomenon. Finally, the adsorbent was successfully applied to real wastewater contaminated with chromium. This application has proved high removal efficiency of Cr (VI) and a yield of 94.31 % was obtained at 40 °C.
Nutraceuticals compounds extraction optimization from open air and swell-dried banana peel powders
(North University of Baia Mare, 2022) Nouioua, Abir; Benseddik, Abdelouahab; Besombes, Colette; Allaf, Karim; Benmounah, Abdelbaki; Djilali, Adiba Benahmed
The aim of this study was to optimize the operating conditions of two drying processes on banana peels: open air and Instant Controlled Pressure Drop technique (DIC) assisted Swell-Drying at 40°C in order to obtain high quality final powders. The optimization of three extraction conditions including extraction temperature (40-100°C), extraction time (10 – 60 min) and particle size (60 – 363 μm) from open air banana peel powder was investigated). Additionally, three DIC texturing conditions were improved. DIC involves maintaining banana peels at a high temperature for 20 to 220s, high steam pressure (p=0.3 to 0.6 MPa) and varying the Number of cycles from 1 to 7. Modelling of some nutraceutical compounds (Total Flavonoids Content and carotenoids) from open air and Swell-Dried banana peels powders by applying experiments design using Response Surface Methodology and Desirability Function. The antioxidant activity was also investigated by the determination of the % of DPPH inhibition. The optimal conditions derived from the multi-Responses-Desirability Function were as follows: 60.47°C; 10min; and particle size Φ= 348.648 μm yielding a TFC=5.13 (mg QE/g d.b), TCC=0.48 (mg /g d.b) and % of DPPH inhibition=73.05%, with an optimal desirability coefficient d=0.7 (open air process). The following optimized DIC operating parameters with maximum desirability coefficient d=1, t=24.46s P=0.59MPa and number of cycles N=6.38 yielding a TFC=4.07 (mg QE/g d.b), a TCC= 1.37 (mg /g d.b) and a % of DPPH inhibition=75.97 %. Banana peel could be a good source of bioactive substances, which could be further used as a natural antioxidant
Performance of Self-Compacting mortars containing foam glass granulate
(2015) Safi, Brahim; Aboutaleb, Djamila; Saidi, Mohammed; Benmounah, Abdelbaki; Benbrahim, Fahima