Browsing by Author "Djeziri, M."

Filter results by typing the first few letters
Now showing 1 - 2 of 2
  • No Thumbnail Available
    Item
    Mechanical and damage properties of polyethylene reinforced with clay treatment
    (Technology Publishing Group, 2021) Chebbab, Brahim; Djeziri, M.; Bezzazi, B.
    This document is the subject of an experimental study for composite material implementation with a polyethylene matrix (HDPE) embedded with clay particles. We carried out a chemical optimization applied to clay particles by characterizing the mechanical behavior as well as the damage of the elaborated composite material. The work is based on the following optimized procedure: a mixture of sodium thiosulfate (Na2S2O3) and clay cooled and centrifuged for 15 minutes. The clay pellet is rinsed twice with 0.05 M HCl for 3 to 4 hours. The mechanical properties of the composite material obtained are relative to the mass fraction of treated and untreated clay. The Young's modulus is found to change as the mass loadings of the injected treated clay change, with a marked improvement over virgin HDPE from 1590.90 to 1667.32 MPa, the yield strength from 28.68 to 31.73 MPa, and the ultimate tensile strength from 19.99 to 20.84 MPa. This positive variation is achieved at a maximum of 7% mass load of treated clay. Beyond this rate, the composite material experiences a drop in these same parameters due to the high concentration of clay. Scanning electron microscopy is used to see differences in dense microstructure between specimen granules
  • No Thumbnail Available
    Item
    Valorization of algerian leguminous: extraction and characterization of galactomannans
    (Aljest, 2018) Bouhadi, N.; Hachemi, N.; Kahlouche, A.; Djeziri, M.; Touabia, M.; Nouani, A.
    This study has an environmental objective based on the valorization of the seeds of legumes in order to obtain a clean nature, its seeds are considered as a good source of galactomannans which can replace other synthetic polysaccharides.They consists on the evaluation of physicochemical properties of galactomanans isolated from different seeds parts of two leguminous species widely known in Algeria: Gleditsia triacanthos and Ceratonia siliqua (carob), which represent an important source of polyscharids. The extraction gave an appreciable yield assessed at 12.97% of Gleditsia triacanthos and 11.45% of Ceratonia siliqua; values witch encourage their valorization. The physicochemical composition of the extracted galactomanans showed comparable characteristics in term of humidity; pH; °Brix and ashes. While; rheologic properties revealed that galactomanans solutions have a pseudo plastic nature. In the other hand; the functional properties analysis showed that the galactomanans obtained are soluble in water; the water absorption capacity was higher for Gleditsia triacanthos than Ceratonia siliqua with 20.62 and 5.98 respectively. Infrared analysis demonstrate that the same chemical structures of galactomanans were extracted from the two spices. NMR analysis allowed us to estimate the galactose / mannose ratio of the two extracts. This ratiois 1.25/1 and 3.63/1 of Gleditsia triacanthos and Ceratonia siliqua respectively