Publications Internationales

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Now showing 1 - 7 of 7
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    Ten-year assessment of the stabilization/solidification method applied to Algerian oil-based drill cuttings: Ain Amenas oil field case study
    (Springer Science and Business Media, 2025) Lounas, Oualid; Malek, Ammar; Aribi, Chouaib; Bouaissi, Aissa; Rekbi, Fares Mohammed Laid
    he effective management and permanent monitoring of the treatment quality of hydrocarbon-contaminated drill cuttings from oil activities constitute major environmental challenges for ensuring treatment’s sustainability and long-term protection of ecosystems. This study investigates the effectiveness of the stabilization/solidification (S/S) process using cement and sodium silicate for treating this hazardous waste from the Ain Amenas site in Algeria. The short-term environmental performance of the process was assessed on cuttings stabilized for a decade, through leaching tests, focusing on parameters such as the total hydrocarbon index (THI), chemical oxygen demand (COD), biological oxygen demand (BOD5), total organic carbon (TOC), and concentrations of heavy metals. Other analyses such as XRD, XRF, and combined (SEM/EDX) were carried out on the stabilized cuttings. Preliminary findings demonstrate successful immobilization of hydrocarbons, organic matter, and several heavy metals (Ni, Zn, Cd, Pb, Hg). However, chromium consistently exceeded tolerable leaching limits, motivating the need to establish potential reasons. SEM/EDX structural analysis showed a heterogenic solid cement matrix with porous areas, enriched in quartz, carbonates, and calcium silicate hydrates (C-S-H), indicative of durable structural properties. XRD effectively showed the complexation of trivalent and hexavalent chromium forms within many cement molecules. However, high levels of residual chlorides and organic matter are of concern as they can successively cause weakening of structures and oxidative action of heavy metals and their release. While S/S is effective in converting pollutant cuttings into a stable form, its weakness in chromium retention requires further optimization to ensure its safe and sustainable application in waste disposal or reuse strategies
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    Thermodynamic Study of Portland Cement Containing Multi-walled Carbon Nanotubes (MWCNT)
    (2023) Naoui, Yassine; Chala, S.; Dorbani, T.; Bouleklab, M.C.; Barama, N.; Bacha, R.; Bdirina, M.; Revo, S.; Hamamda, S.
    The objective of this work is the thermodynamic study of portland cement containing multi-walled car- bon nanotubes. The measurements of the thermal expansion coefficient of the two pure samples and its nanocomposite have the same shape. The dilatometric curves contain the same number of abnormalities. Their intensity differs from sample to sample. The calorimetric study reveals a similar character between the DSC curves of the two samples, the matrix and its nanocomposite. The thermogravimetry of the two materials shows the presence of several anomalies probably linked to the phenomena of dehydration. The insertion of the multi-walled carbon nanotubes into the cement made the nanocomposite stable over a wide temperature range compared to the cement matrix
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    Identification and evolution of clay minerals in the sand-shale reservoirs of the Berkine basin (Algeria)
    (HAL, 2010) Boudella, Amar; Aliouane, Leila; Bounif, Abdallah; Benaïssa, Zahia; Benaissa, Abdelkader; Bentellis, Abdelhakim; Aïfa, Tahar
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    Physico-mechanical properties and thermal behavior of firebrick-based mortars in superplasticizer presence
    (Elsevier, 2016) Saidi, Mohammed; Safi, Brahim; Benmounah, Abdelbaki; Megdoud, Nadjiba; Radi, Faiza
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    Effects of alkaline and alkaline-earth ions on the rheological behavior and zetametric study of two cement pastes (artificial cement portland-CEMI and cement resistant to the sulfates-CRS) with the polynaphthalene sulfonate (PNS)
    (2012) Kheribet, R.; Samar, M.; Benmounah, A.; Safi, Brahim; Said, M.
    The use of admixtures which tends to be generalized in the formulation of self-compacting concrete (SCC), requires taking into account the chemical co mposition of cement, particularly its content of SO 3 , which can inhibit or restrain the effect of these a dmixtures (superplasticizers). For more information of the compatibility problem of cement-superplasticize r, the rheological tests with a rheometer-AR2000 and measurements of zeta potential with a Zêtasiser -2000 were used in this study. In order to understand this phenomenon due to the presence of S O 3 in cement, we propose to evaluate the action of alkaline and alkaline-earth ions, incorporating different types of additions (K + , Na + , and Ca 2+ ) to the cement pastes. To achieve this, our work will conce rn the study of rheological properties and physical characteristics of the pastes obtained using two ty pes of cement (C1: Cement Resistant to the Sulfates (CRS) and C2: CEMI). This experiment will focus on two reports: Water/Cement ( W/C) = 0.30 for which the polynaphthalene sulfonate (PNS) is used as supe rplasticizer and W/C = 0.50 (without superplasticizer). The results show that the presen ce of sulfate leads to different rheological behavi ors which are function of sulfates and the cements used
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    Effect of the heat curing on strength development of self-compacting mortars containing calcined silt of dams and ground brick waste
    (2013) Safi, Brahim; Ghernouti, Y.; Rabehi, B.; Aboutaleb, Djamila
    The strength development of self-compacting mortars (SCM) containing calcined silt (CS) and ground brick waste (GWB) was investigated. The variables are the nature of addition (CS and GWB) in the binder and the heat curing at different temperatures (20 ºC and 60 ºC) at 7 and 14 days of curing. Two temperatures 20 and 60 ºC were applied to samples with intermediate levels (depending on the drying method applied to precast) for 18 hours in total. In this study, a Portland cement (CEMII), Calcined silt (750 ºC for 5 hours), ground waste brick, were used in the binders of SCM. The results show that the compressive strength to 14 days of mortars, increases with annealing (60 ºC) compared to that measured at 20 ºC. Also, values of compressive strength of mortars at 14 days that are close to those obtained without 28 days curing treatment. Indeed, a strength gain of about 20.5% and 27.3% was obtained respectively for the SCM with GWB and the SCM with CS. However, a small change in mass recorded for both types of mortars
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    Development and structural study of cements containing additions of industrial waste
    (2010) Saidi, M.; Hamiane, M.; Safi, Brahim; Benmounah, A.
    Certain mineral additions exploit a very significant role the behavior and the ageing of the works in the corrosive conditions and one can use them like barriers against the aggressiveness and the phenomenon of corrosion of the concretes. Cements made up of additions can be recommended especially in massive works, the stoppings, maritime and underground constructions and in the cementing of the oil wells. The use of the adequate additions ensures the long-term stability and durability of the concretes of the underground, maritime works and the cementing of the oil wells… etc. To this end, within the framework of valorization of these additions (active and inert), in this study we were interested only in the study of the influence of incorporation of limestone, pozzolana, slag, tuff and dust electrostatic precipitator (crushed finely) like active addition in the matric E of cement, its effect on the behavior and ageing of cement S made up and on the microstructure of the concrete by a structural characterization by XRD