À propos de Laurent Ibos

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Jusqu'à présent Laurent Ibos a créé 7 entrées de blog.

Thermophysical characterization of Posidonia Oceanica marine fibers intended to be used as an insulation material in Mediterranean buildings

The present work focuses on the study of the thermophysical properties of Posidonia Oceanica natural fibers in order to investigate the potential of their use as loose-fill thermal insulation material in the Mediterranean construction. 24 samples were prepared. Bulk densities were varied from 17 kg m-3 to 155 kg m-3. Chemical alkali treatments with various conditions were applied to these fibers. The influence of treatments and of density on morphological and thermophysical properties of samples was evaluated. The surfaces were examined by using scanning electron microscopic. The thermal measurements were performed with the Hot Disk thermal constants analyzer. Results have shown that thermal conductivity decrease when density decreases until an optimum. After that, it increases as the density is reduced. Furthermore, regarding thermal conductivity, it was found out that the effect of chemical treatment is not significant mainly at the low densities. A very slight improvement was found at high densities with treated fibers, mainly the treatment that consists of immerging fibers twice in 2% sodium hydroxide solution during 2 h at 80 °C. Higher mass heat capacity was observed with this same treatment. Additionally, it was revealed in this study that Posidonia-Oceanica fibers have thermal conductivity and thermal diffusivity close to conventional insulation materials and higher mass heat capacity that reached 2533 J kg-1 K-1.

Par |2020-07-16T09:51:55+00:00juillet 16th, 2020|Articles dans revues internationales à comité de lecture|Commentaires fermés sur Thermophysical characterization of Posidonia Oceanica marine fibers intended to be used as an insulation material in Mediterranean buildings

Séminaire Professeur Lin BORONG

Dans le cadre de la venue du Professeur Lin BORONG, Professeur invité de l'Université Paris-Est, le CERTES a organisé une demi-journée scientifique à l’IUT de Créteil-Vitry le 19 septembre de 14h à 17h30. L’évènement a été animé par Mahamadou ABDOU-TANKARI et Mustapha KARKRI, Maîtres de Conférences au CERTES. Ce séminaire a été l'occasion de nombreuses discussions et échanges sur les collaborations scientifiques entre les deux structures.

Par |2019-09-23T14:24:38+00:00septembre 23rd, 2019|Actualités|Commentaires fermés sur Séminaire Professeur Lin BORONG

Master Class Professeur Lin BORONG

Dans le cadre de son séjour au sein du CERTES, le Professeur Lin BORONG de l'Université de TSINGHUA (Chine), Professeur invité de l'Université Paris-Est, va animer une Master Class du 23 au 26 septembre 2019, chaque jour de de 14h à 17h30.

Par |2019-09-20T09:00:23+00:00septembre 12th, 2019|Actualités|Commentaires fermés sur Master Class Professeur Lin BORONG

Séminaire des Doctorants 2018

Le séminaire annuel des doctorants du CERTES s’est déroulé le mardi 9 octobre 2018 à l’IUT de Créteil-Vitry. Douze doctorants du laboratoire ont tout d’abord exposé leur sujet de thèse sous la forme d’une présentation « flash » de 180 secondes devant l’ensemble des membres du laboratoire. Les échanges se sont ensuite poursuivis lors d’une session « Poster ».

Par |2019-10-04T09:31:58+00:00juillet 11th, 2019|Actualités|Commentaires fermés sur Séminaire des Doctorants 2018

Investigation of Fiber Surface Treatment Effect on Thermal, Mechanical and
Acoustical Properties of Date Palm Fiber-Reinforced Cementitious Composites

Abstract High energy consumption in the building sector appeals for the implementation and the improvement of innovative approaches with low-environmental impact. The development of eco-friendly composites as insulating materials in buildings provides practical solutions for reducing energy consumption. Different mass proportions (2.5%, 10%, and 20%) of untreated and chemically treated palm fibers were mixed with (cement, water and sand) so as to prepare novel composites. Composites were characterized by measuring water absorption, thermal conductivity, compressive strength and acoustic transmission. The results reveal that the incorporation of untreated and chemically treated date palm fibers reduces novel composites’ thermal conductivity and the mechanical resistance. Thermal measurements have proved that the loading of fibers in composites decreases the thermal conductivity from 1.38 W m−1 K−1 for the reference material to 0.31 W m−1 K−1 for composites with 5% of treated and untreated fibers. The acoustical insulation capacity of untreated palm fiber-reinforced composites (DPF) was the highest at 20% fiber content, whereas treated palm fiber-reinforced composites (TPF) had the highest sound insulation coefficient for fiber content lower than 10%. Compressive strength, thermal conductivity and density correlation showed that only chemically treated fiber-reinforced composites (TPF) are good candidates for thermal and acoustic building insulations.

Par |2020-07-18T21:23:05+00:00juillet 9th, 2019|Articles dans revues internationales à comité de lecture, Productions|Commentaires fermés sur Investigation of Fiber Surface Treatment Effect on Thermal, Mechanical and
Acoustical Properties of Date Palm Fiber-Reinforced Cementitious Composites
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