Publications Internationales

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Now showing 1 - 8 of 8
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    The Synergistic Effect of Algerian Na-Bentonite/Potato Starch/Grass Powder on the Enhancement of Aged Water-based Drilling Fluids
    (Springer, 2022) Sid, Asma Nour El Houda; Benalia, Kouin; hazourli, Abdelkrim; Djafar, Rabah; Gherraf, Noureddine; Bououdina, Mohamed
    Nowadays, the use of eco-friendly additives in drilling fluids to improve rheological properties is widespread. This work aims to examine and assess the rheological characteristics and fluid loss of drilling fluid suspensions containing Algerian Na-Bentonite (NaB) and potato starch (PS) as viscosifier upon the addition of grass powder (GP). The obtained results indicate that the aging tests applied on different drilling fluid suspensions during 192 h at (20 °C) reduce the values of apparent viscosity by an average of (14.3%), plastic viscosity (22.2%), yield point (6.7%), and shear stress (47.3%) when varying the (PS) concentration in the suspensions (0.6, 1.2, 2%) as well as the values of fluid loss (9.5%); meanwhile, the values of initial and final gel strength are increased (32.6% and 19.6%, respectively). Subsequently, the possibility to further improve the rheological properties of drilling fluid suspensions using an environment eco-friendly additive (GP) has been studied. The introduction of (3, 6, 9 g) GP in the aged suspensions increases the values of rheological properties, i.e., the highest efficiency of 18.4% has been achieved by adding 9 g of GP to 2% (PS) aged suspension. The fluid loss test indicates that increasing the (GP) concentration in the (NaB+PS) suspension reduces the fluid loss volume by 36.42%. This study demonstrates the synergy of combining cost-effective GP to (NaB+PS) in aged drilling fluids by enhancing significantly its rheological properties besides a better environmental protection.
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    Use of recycled plastic bag waste in the concrete
    (2014) Ghernouti, Youcef; Rabehi, Bahia; Safi, Brahim; Chaid, Rabah
    The aim of this study is to explore the possibility of re-cycling a plastic bag waste material (BBW) that is now produced in large quantities in the formulation of concrete as fine aggregate by substitution of a variable percentage of sand (10, 20, 30 and 40 %). The influence of the PBW on the fresh and hardened states properties of the concrete: workability, bulk density, ultrasonic pulse velocity testing, compressive and flexural strength of the different concretes, has been investigated and analyzed in comparison to the control concrete. The results showed that the use of PBW improves the workability and the density, reduces the compressive strength of concrete containing 10 and 20 % of waste by 10 to 24 % respectively, which have a mechanical strength acceptable for lightweight materials, remains always close to reference concrete (made without PBW). The results of this investigation consolidate the idea of the use of PBW in the field of construction, especially in the formulation of concrete
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    Tableting : alternate way of valorization of agro-resources
    (2012) Benamara, Salem; Aksil, Tounsia; Boukhiar, Aissa; Megdoud, Djemaa; Iguergaziz, Nadia; Babouri, Sara; Galouz, Mohand Salah; Nakib, Wahiba; Rahal, Sofiane
    In this work we attempt to investigate the possibility of use tableting as alternate way for valorization of some agro-resource species, including, certain date (Phoenix dactylifera L.) fruit varieties as ordinary edible fruit, strawberry tree (Arbutus unedo) berries and numerous medicinal plants. The preliminary results obtained are conclusive. In all cases, the date fruit powder is used as base matrix because of its capacity to undergo tableting. The combination of various plant species with date fruits allowed to obtain tablets with convenient physical proprieties in terms of hardness, disintegration time, erosion…Also, the final product acquired an appetizing flavor which is of a particular interest when the initial non-food matrix has a disagreeable taste. Thus, the formulation of such tablets from medicinal plants hides the bitterness, making the product more acceptable to consumers, especially those suffering from various diseases. Also, the fast dissolution of the date powder, thanks to the presence of natural simple sugars, make the obtained tablets very convenient for some patients. The physical-chemical proprieties of powder and then tablets from lyophilized strawberry berries are also investigated. Taking into account its high content in vitamin C, this powder can be employed as other natural ingredient enhancing the nutritional value of tablets, as well as their stability. Finally, the effervescent ability of date powder is studied, varying the proportions of some chemical reactants like tartaric acid, citric acid, sodium carbonate and bicarbonate
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    Study of reconditioning of the Eucalyptus camaldulensis dehn
    (2010) Tazerout, M.; Abadlia, Mohamed Tahar; Oudia, A.
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    Study of calcined halloysite clay as pozzolanic material and its potential use in mortars
    (2012) Rabehi, B.; Boumchedda, K.; Ghernouti, Y.
    In this research, we will try to understand the mechanisms involved in the introduction of calcined clays in substitution for a portion of cement in the manufacture of mortars. This experimental work focuses on the recovery of a clay type haloysite quality three, from eastern Algeria. This clay comes from a region called Djbel Debbagh hence its name (DD3). The main objective of this study is to see the influence of the activated clay by calcination with different percentages of 5, 10, 15 and 20% in substitution of cement, on the physical-mechanical properties and behaviour of mortars towards chemical attacks. The study of pozzolanic activity allows to optimize a calcinations temperature of about 750°C, the study of its mechanical performance has shown an improvement of strength. Finaly the results of the durability test showed a good performance in different environments
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    Strength and durability of mortar made with plastics bag waste (MPBW)
    (Springer, 2012) Ghernouti, Y.; Rabehi, B.
    The aim of this study is to explore the possibility of re-cycling a waste material that is now produced in large quantities, while achieving an improvement of the mechanical properties and durability of the mortar. This study examines the mechanical properties and the durability parameters of mortars incorporating plastics bag wastes (PBW) as fine aggregate by substitution of a variable percentage of sand (10, 20, 30 and 40 %). The influence of the PBW on the, compressive and flexural strength, drying shrinkage, fire resistance, sulfuric acid attack and chloride diffusion coefficient of the different mortars, has been investigated and analyzed in comparison to the control mortar. The results showed that the use of PBW enabled to reduce by 18–23 % the compressive strength of mortars containing 10 and 20 % of waste respectively, which remains always close to the reference mortar (made without waste). The replacement of sand by PBW in mortar slows down the penetration of chloride ions, improves the behavior of mortars in acidic medium and improves the sensitivity to cracking. The results of this investigation consolidate the idea of the use of PBW in the field of construction
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    Characterization of an effluent of an algerian oil mill
    (2012) Didouche, Yasmina-Fadila; Idouhar, M.
    This work concerns to characterize the effluent, a by-product of an Algerian oil mill, for its valorization. A microbiological study certified the healthiness of the effluent, followed by various means of analysis such as their observation under the microscope, water chemistry, thin layer chromatography, infrared and the ultra-violet spectrophotometry. The results of analyses suggest that the effluents is biodegradable (86.54 %) and present in form of an emulsion of type I i.e., oil-in-water mouthful of soap (15.5 g/L), bathing in conservatives. The results of a traditional analysis inherent in the soap corroborated these results. Moreover, a viscoplastic rheology was surrounded by the determination of various viscosities of the effluent, whose stability is ensured by the presence of contaminants, revealed by atomic absorption spectrophotometry