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    Rheological Optimization of Steel Fiber-reinforced Self-compacting Concrete (SFSCC) Incorporating Calcareous Tuff Powder (CTP)
    (Jordan University of Science and Technology, 2025) Gueciouer, Djamila; Naadia Tarek; Ghernouti Youcef; Mansour Malika Sabria
    The purpose of this study is to formulate a steel fiber-reinforced self-compacting concrete (SFSCC) with optimal rheological properties, using calcareous tuff powder (CTP) as an addition and partial substitution for cement. The design of experiments (DOE) method was used to analyze the effect of fiber dosage, paste volume, and gravel-to-sand ratio on the SFSCC. A concrete rheometer was used to quantify the intrinsic rheological parameters. The rheological results of the SFSCC containing calcareous tuff powder indicate that both paste volume and fiber dosage significantly affect flow capacity, while plastic viscosity is exclusively governed by paste volume. The measured rheological parameters indicated that the steel fiber-reinforced selfcompacting concrete incorporating calcareous tuff powder is a high yield stress selfcompacting concrete (HYSCC), with yield stress values ranging from 62 Pa to 335 Pa and plastic viscosity values between 12 and 31 Pa.s. Rheological optimization through the DOE method allowed the identification of optimal composition factors, ensuring a targeted self-compacting behavior. The self-compacting behavior of the SFSCC observed in the rheometer was confirmed and validated at full scale, with slump flow values up to 72 cm and flow time (T500) between 3.0 seconds and 4.3 seconds.
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    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
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    Rheological behavior and microstructural properties of crude oil and emulsions (water/oil-oil/water)
    (Taylor & Francis, 2024) Yacine, Celia; Safri, Abdelhamid; Djemiat, Djamal Eddine; Benmounah, Abdelbaki
    An experimental study on crude oil (from the Tin Fouye Tabankort oil field in southern Algeria) was carried out. This study allowed us to understand the rheological behavior of this crude oil with these different emulsions and how it reacts under the effects of temperature and the inversion of its phase from E/H to H/E. So we measured the rheological characteristics by tests flow and dynamic mode at different temperatures from 10 °C to 50 °C and at different water concentrations (20.40.50.60 and 70%) at a fixed temperature of 20 °C. The increase in temperature results in a 31.84% reduction in the initial viscosity of the crude oil. The addition of the volumic fractions of water results in an increase in viscosity at the point of inverse, which will decrease the apparent viscosity of these emulsions where the emulsions (W/O) come from (O/W). This crude oil and their emulsions exhibit a non-Newtonian behavior with shear thinning. The dynamic analysis depends on the temperature and the percentages of water added to the crude oil. At the end, a microscopic analysis was added to verify the relationship between the shape and diameter of the water droplets in each emulsion and the viscosity variation.
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    Optimization of partially hydrolyzed polyacrylamide (HPAM) utilized in water-based mud while drilling
    (MDPI, 2023) Sid, Asma Nour El Houda; Kouini, Benalia; Bezzekhami, Mohammed Amin; Toumi, Selma; Ouchak, Khadidja; Benfarhat, Sara; Tahraoui, Hichem; Kebir, Mohammed; Amrane, Abdeltif; Assadi, Aymen Amine; Zhang, Jie; Mouni, Lotfi
    Water-soluble polymers are becoming increasingly important in various applications, such as stabilizer fluids and drilling muds. These materials are used as viscosifiers and filtration control agents, flocculants, and deflocculants due to their superior properties in increasing viscosity and gelling ability in the presence of crosslinkers. In general, studying the rheological behavior of drilling fluids is of paramount importance to ensure successful well drilling operations. Partially hydrolyzed polyacrylamide is one of the polymers widely used in water-based muds. The main objective of this study is to optimize the rheological properties of drilling muds through a characterization study of various parameters, including rheological behavior, viscosity, temperature (23 °C, 40 °C, and 60 °C), salinity using KCl and NaCl contents, aging, pH, solubility, and structural analysis using infrared of partially hydrolyzed polyacrylamide. The study aims to demonstrate the importance of using polymers in drilling muds. The findings revealed that a rate of 3% of HPAM gave better rheological behavior, the influence of KCl (1.5%, 3%, and 4.5%) was greater than that of NaCl (1.5%, 3%, and 4.5%) on polymers, and the aging test showed that the different formulations are stable and maintain their behavior up to 110 °C. The solubility test results confirmed the maximum amount absorbed by polyacrylamide ([CHPAM] = 66.42 g/L) in order to avoid aggregation, gelification, and enhance the drilling mud by utilizing the prescribed contents
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    Comparative investigation of the effect of eggshellpowder and calcium carbonate as additivesin Eco-Friendly polymer drilling fluids
    (MDPI, 2023) Sid, Asma Nour El Houda; Tahraoui, Hichem; Kebir, Mohammed; Bezzekhami, Mohammed Amin; Kouini, Benalia; Hassein-Bey, Amel Hind; Toumi, Selma; Amrane, Abdeltif; Imessaoudene, Ali
    Drilling fluid systems have seen the addition of new natural additives in recent years in order to replace traditional additives, improve their rheological properties, and ensure the functionality of the drilling fluid taking into account health and environmental factors. This paper aims to study and compare the effect of the addition of eggshell powder (ESP) as a native and local additive and calcium carbonate (CC) as a traditional and conventional additive on the rheological and filtration properties of the drilling fluid system based on Na-bentonite of the region of Meghnia (Algeria). The test results of 10, 20, and 30 g of CCwerecompared to the same concentrations of ESP.The findings showed that the CC with various concentrations (10, 20, and 30 g) increases the rheological properties and the mud density while it reduces the filter cake and the fluid loss values which are desirable, calcium carbonate had aslightly higher effect on the pH. The obtained results following the addition of ESP with different ratios revealed that the latter has a considerable impact on the plastic viscosity, the yield point, the gel strength, and the cake thickness. Additionally, the effect of the presence of eggshell as an additive in pH, fluid loss, and mud density was studied; we observed a slight increase in the pH, while the fluid loss values decreased. However, the mud density values increased. Beyond 20 g of eggshell, the properties of the mud becomeundesirable. Moreover, this study contributes tonewfindings and suggests that the utilization of waste food and local goods in drilling mud mixtures has a bright future respecting the percentages of use
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    Polyacrylamide Grafted Xanthan: Microwave-Assisted Synthesis and Rheological Behavior for Polymer Flooding
    (MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affil- iations., 2021) Chami, Souheyla; Joly, Nicolas; Bocchetta, Patrizia; Martin, Patrick; Aliouche, Djamel
    Application of polymer-flooding systems in secondary and tertiary oil recovery represents a real challenge for oil industry. In this work, our main objective is to explore possibilities of making use of xanthan-g-polyacrylamide for polymer flooding in a particular Devonian oilfield of medium salinity. The graft polymer was synthesized by using microwave-assisted graft copolymerization reaction of acrylamide on xanthan. The synthesized copolymer with optimized grafting parameters has been characterized by Infrared Spectroscopy and Thermal Analysis (DSC). Rheological analysis by steady shear and oscillatory flow experiments have been subsequently performed for xanthan and grafted xanthan under reservoir conditions. In steady shear, as expected the grafted polymer solutions flow as shear-thinning materials and apparent viscosity showed good fits with Cross's model. The viscosity losses due to salinity or temperature are more controlled for the grafted xanthan compared to pristine xanthan. When the grafted polymer concentration is increased to 2000 ppm the losses were halved. In oscillatory shear, the copolymer solutions followed a global behavior of semi-dilute entangled systems; furthermore, all dynamic properties were influenced by the brine salinity. Compared to xanthan, the elastic properties of xanthan-g-polyacrylamide solutions have been significantly improved in saline media and the losses in elasticity of grafted polymer solutions are lower.
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    Rheological behavior of oil sludge from Algerian refinery storage tanks
    (Elsevier, 2022) Souas, Farid
    Rheological behavior of oil sludge from Algerian refinery storage tanks Farid Souas a, b, * a LEGHYD Laboratory, Faculty of Civil Engineering, University of Science and Technology Houari Boumediene (USTHB), Bab Ezzouar, Alger, Algeria b Research Unit Materials, Processes and Environment (UR-MPE), Faculty of Engineering Science, University M’Hamed Bougara, Boumerdes, Algeria a r t i c l e i n f o Article history: Received 15 August 2021 Received in revised form 20 December 2021 Accepted 28 January 2022 Available online xxx Keywords: Crude oil Rheology Sludge Storage tank Temperature Viscosity a b s t r a c t The consumption and demand for petroleum are increasing dramatically with the rapid development of industry and energy sector. As a result, petroleum refineries produce the greatest amount of oily sludge formed at the bottom of storage tanks during oil storage operations, which has a severely negative impact on the storage capacity and the operational safety of the storage tank. The present study focuses on the rheology of this complex fluid from Algerian crude oil storage tanks. Rheological measurements were performed at different temperatures under steady shear and dynamic oscillometry using AR-2000 Rheometer. The results obtained show that the sludge exhibits yield-pseudoplastic flow behavior at low shear rates, which is adequately described by the Herschel Bulkley model based on the standard error and correlation coefficient values. However, quasi-Newtonian flow behavior occurs at very high shear rates. The increase in temperature had positive effects on the rheological properties of the sludge, including dynamic viscosity, shear stress, yield stress, complex modulus, elastic modulus and viscous modulus. The dynamic rheology studies have shown that the sludge material behaves more like a solid than a liquid under all experimental conditions studied
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    Valorization of mixed metal hydroxide on Algerian Na-Bentonitesuspensions: Application to water-based drilling fluid
    (Elsevier, 2020) Akkouche, A.; Benmounah, A.; Gueciouer, A.; Chalah, K.
    The use of mixed metal hydroxide tri-cationic (Li+,Mg+2,Al+3) in water based drilling fluids brought to thebirth of a new air and perspective to improve the using of Bentonitic suspension as viscosifier in drillingfluids.The aim of this work is to study the possibility of using mixed metal hydroxide and see his effect atdifferent percent (5%, 10%, 15% and 20% by Wt of Bentonite) on the rheological behavior and colloidalproperties of Algerian Na-Bentonite suspension (30 kg/m3).Rheological tests and Zeta Potential measurements have been performed for each prepared suspension.The results show that the adding of MMH on Algerian Na-Bentonite increases the yield stress to 1.39 Pasat 20% MMH, however a stable suspension was observed 41 mV of Zeta Potential measurement at 10%MMH with yield stress of 1.17 Pas.
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    Studies on equilibrium swelling, dye adsorption, and dynamic shear rheology of polymer systems based on chitosan-poly(vinyl alcohol) and montmorillonite
    (Taylor & Francis, 2019) Amri, Nedjla; Radji, Sadia; Ghemati, Djamila; Aliouche, Djamel
    Chitosan-poly(vinyl alcohol)/clay membranes were prepared by physical blending. Thesehybrid systems were characterized through infrared spectroscopy, microscopy, swelling, andoscillatory rheology. Adsorption of a commercial reactive dye by these membranes was fur-ther studied. Results showed that more stable blend membranes were formed due to thestrong interaction in the polymers. These membranes showed substantial percent swellingin water and shrinking in saline solution. Adsorption analysis showed the ability of theblends to fix organic dyes, and to be used in liquid waste processing. In dynamic rheology,it was observed that all measured viscoelastic properties were influenced by polymer com-position and clay content. For all samples, results show a typical behavior of an entangledsystem in the case of low concentrated macromolecular viscoelastic fluids. The dynamicmoduli exhibited higher values for blends, compared with values of the pure polymers,which is an indication of good stability and tendency of gel formation
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    Rheological behavior of cement-based grout with Algerian bentonite
    (Springer Nature, 2019) Benyounes, Khaled
    he rheological parameters, yield stress, flow index, consistency, and plastic viscosity of cement grouts are important parameters for the quality control of these materials. These parameters are assessed from the rheogram using a rheo-logical model. Cement slurries without additive indicated a non-Newtonian type of rheological behaviour with yield stress. On the other hand, the mixtures containing a viscosifying agent exhibit a shear-thinning rheological behaviour which is much more important than the mixtures without a viscosifying agent. In this work, we formulated non-hydrated Algerian bentonite cement slurry in the presence of a superplasticizer. Cement was replaced cement by bentonite in five different substitution rates (2%, 4%, 6%, 8%, and 10%) and the water/binder ratio was fixed at 0.5. For this, various rheological tests were realized by using a controlled stress rheometer. In order to show the influence of bentonite on the rheological behaviour of the different grouts, several flow tests were carried out for a range of shear rates between 0.01 and 200 s−1. To properly adjust the different rheograms, various rheological models were used such as the models of Bingham, Herschel–Bulkley, modified Bingham, Casson, De Kee, Vom Berg, Yahia and Papanastasiou. For the correct choice of the rheological model, it was based on the calculation of the standard error. It was found that the rheological models of Herschel–Bulkley and Papanastasiou made it possible to better describe the flow curves compared to the other rheological models. It has been found that as the content of bentonite increases, the yield stress and the consistency evolve drastically, by cons the flow index decreases progressively