Publications Scientifiques

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Author: search.filters.author.Lamri, Y.Has files: Yes

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    Glass foam composites based on tire's waste for microwave absorption application
    (Elsevier, 2020) Lamri, Y.; Benzerga, R.; Ayadi, A.; Gendre, L.L.; El-Assal, A.
    Waste glass and tire based glass-foams have been studied to produce a low-cost microwave absorbing material that could be used in building industry. These composites show, firstly, an heterogeneous structure induced by the degradation of the tires during the heat treatment, and secondly, low dielectric loss partially induced by their low densities. In order to avoid the heterogeneity of the samples, two different composites, using tire waste, have been tested. For the first composite, tires were coated with a refractory material, for the second, tires were pre-calcined before composite preparation. The use of calcined tires, which contain more than 99 wt.% of carbon, has led to homogenous composites with higher dielectric loss (tanδ = 0.33@10GHz). The absorption performance simulation of these composites shows encouraging results. A low reflection (close to −30 dB @ 11.90 GHz) and a large absorption bandwidth have been obtained for carbon (calcined tires) loaded foam composite with a thickness of 12 mm. © 2020 Elsevier B.V
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    Elaboration and characterization of a cellular glass based cullet loaded with carbon fibers
    (Elsevier, 2015) Benhaoua, F.; Ayadi, A.; Stiti, N.; Lamri, Y.; Ratni, H.
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    Elaboration and characterization of acellular glass based culletloaded with carbon fibers
    (Elsevier, 2015) Benhaoua, F.; Ayadi, A.; Stiti, N.; Lamri, Y.; Ratni, H.
    The foams glass whose porosity is very important, are counted among the new glass products that meet certain desired comfort needs in the particular building area (thermal and acoustic insulation). The objective of this study is to determine the influence of the carbon fibers addition influence on the porosity, the thermal insulation and dielectric loss of foams glass prepared by sintering at 800 °C, which opens the way to foam glass many possibilities for industrial to extend their opportunities that are very varied from thermal insulation to electromagnetic waves absorption. The carbon fibers addition used for this study is 1, 2, 3.5 and 5 wt% in relation to the foam glass load. Physico-chemical analysis techniques such as SEM-EDS, porosity, thermal insulation, differential thermal analysis, and dielectric tests have been used for the foams glass characterization. The obtained microstructure results clearly show that the 5 wt% carbon fibers addition increases the foam glass porosity which leads to low thermal conductivity (λ=0.0281 W/m°C) and increases its thermal insulating capacity. Furthermore the specific dielectric properties as real permittivity (ε'=2.7619) and high dielectric loss (tan δ=0.02969) favor the use of these glass filled foams with carbon fibers in the electromagnetic waves microwave absorption in the weakest working frequencies (mobile phones and Wi-Fi). © 2015 Elsevier B.V. All rights reserved