Publications Internationales

Permanent URI for this collectionhttps://dspace.univ-boumerdes.dz/handle/123456789/13

Browse

Has files: NoSubject: search.filters.subject.Cement

Search Results

Now showing 1 - 2 of 2
  • No Thumbnail Available
    Item
    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
  • No Thumbnail Available
    Item
    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