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Effect of chemicals treatments on the morphological, mechanical, thermal and water uptake properties of polyvinyl chloride/palm fibers composites / Hamida Boussehel in REVUE DES COMPOSITES ET DES MATERIAUX AVANCES, Vol. 29, N° 1 (02/2019)  

[article]  inREVUE DES COMPOSITES ET DES MATERIAUX AVANCES > Vol. 29, N° 1 (02/2019) . - p. 1-8 Titre : Effect of chemicals treatments on the morphological, mechanical, thermal and water uptake properties of polyvinyl chloride/palm fibers composites Type de document : texte imprimé Auteurs : Hamida Boussehel, Auteur ; Djamel Eddine Mazouzi, Auteur ; Noureddine Belghar, Auteur ; Belhi Guerira, Auteur ; Mohamed Lachi, Auteur Année de publication : 2019 Article en page(s) : p. 1-8 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Chlorure de polyvinyle Composites à fibres végétales Composites à fibres végétales -- Propriétés mécaniques Composites à fibres végétales -- Propriétés thermiques Fibres de palmes Humidité -- Absorption:Eau -- Absorption Morphologie (matériaux) Traitement chimique Index. décimale : 668.4 Plastiques, vinyles Résumé : The use of natural resources in composite materials becomes more frequently, as they are low-colt and lightweight materials. In addition, industrial trends tend towards Eco-products, hence the importance of integrating natural products that are recyclable and easily degradable. Aim of this study is prepared polymer composites of polyvinyl chloride (PVC) using palm fibers at different loading (10 and 30 % by weight). Improving the interfacial adhesion between matrix- fluer interfaces using chemical modification of date palm fibers (DPF) by two types of treatments (acetylation, alkali). The effect of chemical treatment and fiber content on morphological, thermal, mechanical and water absorption properties of composites have been studies. It was found that the use of treated fibers in PVC composites improves the mechanical properties and decomposition temperature, and reduce water absorption of the composites. Note de contenu : - MATERIAL AND METHODS : Materials - Chemical treatments of palm fibers - Preparation of PVC composites - Characterization - RESULTS AND DISCUSSION : FTIR results - Characterization of PVC composites - Table 1 : Properties of polyvinyl chloride (PVC) - Table 2 : Thermal degradation and derivative weight loose of each thermal degradation stage with 30 wt% of fiber - Fig. 1 : FTIR spectra of untreated, acetylated and alkali treated palm fibers - Fig. 2 : SEM micrographs of PVC composites with : neat PVC, untreated fibers, acetylated and alkaly treated palm fibers - Fig. 3 : Tensile strength of neat PVC and composites with trated and untreated fibers - Fig. 4 : Elongation at break of neat PVC and composites with treated and untreated fibers - Fig. 5 : Shore hardness of neat PVC and composites with treated and untreated fibers - Fig. 6 : Thermograms of weight loss, and derivative weight loss of neat PVC and composites with 30 wt% of treated and untreated fibers - Fig. 7 : Water absorption of neat PVC and composites with treated and untreated fibers DOI : https://doi.org/10.18280/rcma.290101 En ligne : https://www.iieta.org/download/file/fid/6902 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34730 [article]

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Stability analysis of electric transmission line tower made with composite material carbon fiber epoxy - An innovative approach / Chiranjit Bhowmik in REVUE DES COMPOSITES ET DES MATERIAUX AVANCES, Vol. 29, N° 1 (02/2019)  

[article]  inREVUE DES COMPOSITES ET DES MATERIAUX AVANCES > Vol. 29, N° 1 (02/2019) . - p. 9-13 Titre : Stability analysis of electric transmission line tower made with composite material carbon fiber epoxy - An innovative approach Type de document : texte imprimé Auteurs : Chiranjit Bhowmik, Auteur ; Prasun Chakraborti, Auteur Année de publication : 2019 Article en page(s) : p. 9-13 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Composites à fibres de carbone Composites à fibres de carbone -- Propriétés mécaniques Epoxydes Pylones électriques Index. décimale : 668.4 Plastiques, vinyles Résumé : Using of composite materials as lattice transmission tower structural material is increasing over conventional zinc galvanized steel materials because of some special features. Special attention should be paid regarding strength and stability of the transmission tower structure which are made with composite materials. In this present study, an effort has been made to analyze the strength and stability of transmission tower made with composite material, Carbon Fiber Epoxy (CFE). The transmission tower is modeled in STAAD considering CFE as structural material to analyze it in terms of strength and stability with different loading conditions in real life application. The maximum tensile stress is found at the transmission tower members near to the base of the structure with the amount of 210MPa. The breaking stress of CFE material is 1200MPa which is much more than the tensile stress occurs at the transmission tower at different loading conditions. The innovative design approach incorporating stability analysis found to be most competent for stating the stability and strength of tower and further clarify the safety approach of design. Note de contenu : - DIFFERENT FORCES/LOADS ASSOCIATED WITH TRANSMISSION TOWER : Wire tension - Transverse load - Longitudinal load - Vertical load - STRENGTH AND STABILITY OF TRANMISSION TOWER IN STAAD PRO : Modeling of transmission tower in STAAD pro - Description of the objective structure - Loading methodology on the tranmission tower - Strength and stability of the tranmsision tower members - Table 1 : Calculated transverse, longitudinal and vertical load - Table 2 : Proposed design parameters for transmission tower - Table 3 : Suitable composite materials for transmission tower available in market - Table 4 : Proposed wire parameters - Fig. 1 : The configuration of existing 132 kv transmission tower with necessary dimensions - Fig. 2 : Differents loads are acting on the tranmission tower - Fig. 3 : Results obtain from STAAD pro, axial force, torsion, stress and displacement DOI : https://doi.org/10.18280/rcma.290102 En ligne : https://www.iieta.org/download/file/fid/597 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34731 [article]

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Strength and performance of straw ash cement mortar / Fucheng Wang in REVUE DES COMPOSITES ET DES MATERIAUX AVANCES, Vol. 29, N° 1 (02/2019)  

[article]  inREVUE DES COMPOSITES ET DES MATERIAUX AVANCES > Vol. 29, N° 1 (02/2019) . - p. 15-20 Titre : Strength and performance of straw ash cement mortar Type de document : texte imprimé Auteurs : Fucheng Wang, Auteur ; Chun Wang, Auteur ; Shujuan Yi, Auteur Année de publication : 2019 Article en page(s) : p. 15-20 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cendres de riz et constituants Contraintes (mécanique) Flexion (mécanique) Matériaux cimentaires Matériaux cimentaires -- Propriétés mécaniques Mortier Paille Résistance à la compression Index. décimale : 620.13 Matériaux de construction : pierre, ciment, béton, liants de Résumé : This paper mainly explores the strength and performance of rice straw ash cernent mortar. Firstly, the straw ash was obtained through high-temperature calcination, and the ash formation rate was measured. Then, the straw ash was rinsed with clean water and mixed into cernent mortar test pieces. According to the mass ratio of cernent in the test pieces, the proportion of straw ash were determined as 5 %, 10 %, 15 % and 20 %, respectively. Next, the following properties of each test piece were measured, including water absorption rate, 3d and 28d flexural strength and compressive strength. On this basis, the flexural strength and compressive strength were fitted and correlated with the proportion of straw ash. The fitting formulas and correlation functions proposed in this paper lay a theoretical basis for the engineering application of straw ash cernent mortar. Note de contenu : - MATERIALS AND METHODS : Materials - Experimental methods - RESULTS AND ANALYSIS : Straw ash formation rate - Test piece water absorption rate - Strength of cement mortar - ESTABLISHMENT OF STRENGTH EQUATION OF STRAW ASH CEMENT MORTA5R TEST PIECES - Table 1 : Chemical composition of the cement - Table 2 : Mixing ratio of straw ash cement mortar - Table 3 : Ash formation rate of rice straw - Table 4 : Water absorption rate of test pieces - Table 5 : Test data of mechanical properties of test pieces DOI : https://doi.org/10.18280/rcma.290103 En ligne : https://www.iieta.org/download/file/fid/994 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34732 [article]

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Preparation and property analysis ofphase change concrete PEG/SiO2-CPCM in REVUE DES COMPOSITES ET DES MATERIAUX AVANCES, Vol. 29, N° 1 (02/2019)  

[article]  inREVUE DES COMPOSITES ET DES MATERIAUX AVANCES > Vol. 29, N° 1 (02/2019) . - p. 21-26 Titre : Preparation and property analysis ofphase change concrete PEG/SiO2-CPCM Type de document : texte imprimé Année de publication : 2019 Article en page(s) : p. 21-26 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Caractérisation Matériaux cimentaires Matériaux cimentaires -- Propriétés mécaniques Polyéthylène glycol Résistance à la compression Silice La silice est la forme naturelle du dioxyde de silicium (SiO2) qui entre dans la composition de nombreux minéraux. La silice existe à l'état libre sous différentes formes cristallines ou amorphes et à l'état combiné dans les silicates, les groupes SiO2 étant alors liés à d'autres atomes (Al : Aluminium, Fe : Fer, Mg : Magnésium, Ca : Calcium, Na : Sodium, K : Potassium...). Les silicates sont les constituants principaux du manteau et de l'écorce terrestre. La silice libre est également très abondante dans la nature, sous forme de quartz, de calcédoine et de terre de diatomée. La silice représente 60,6 % de la masse de la croûte terrestre continentale. Sol-gel, Procédé Thermocinétique Transition de phase En physique, une transition de phase est une transformation du système étudié provoquée par la variation d'un paramètre extérieur particulier (température, champ magnétique...). Cette transition a lieu lorsque le paramètre atteint une valeur seuil (plancher ou plafond selon le sens de variation). La transformation est un changement des propriétés du système. Index. décimale : 620.13 Matériaux de construction : pierre, ciment, béton, liants de Résumé : With polyethylene glycol (PEG) as the phase change material (PCM), and silica sol as inorganic porous carrier, this paper prepares the polyethylene glycol/silica sol composite phase change material (PEG/Si02-CPCM) using sol-gel method, and adds PEG/Si02-CPCM into concrete to prepare phase change concrete according to the absolute volume method. Next, this paper uses scanning electron microscopy (SEM) and differential scanning calorimetry (DSC) to characterize the microstructure, compatibility, stability and energy storage of PEG/Si02-CPCM, and tests the compressive strength and thermal conductivity of the phase-change concrete. The results show that PEG-2000 had a good compatibility with Si02; the mass fraction of PEG in the CPCM should be controlled within 90 %; after 200 thermal cycles, the mass loss is less than I %. The PEG/Si02-CPCM starts to undergo phase change at the temperature of 42.4 °C; the strength of the phase-change concrete with a 5 % PEG content dropped by about 4.96 %; under the premise of ensuring good working performance, the addition of the PEG/Si02-CPCM can greatly enhance the thermal conductivity of the concrete. Note de contenu : - EXPERIMENT : Raw materials - Test and characterization methods - Preparation of PEG/SiO2 composite shape-stabilized phase change material - Design of phase change concrete mixing ratios - RESULTS AND DISCUSSION : PEG/SiO2 adsorption rate and SEM analysis - Compatibility analysis - Phase change cycle stability - Mechanical properties of hpase change concrete - Thermal conductivity of phase change concrete - Table 1 : Mass ratio of PEB and silica sol - Table 2 : Mixing ratio of standard concrete - Table 3 : Mixing ratio of phase change concrete - Table 4 : Phase change cycle stability - Table 5 : Mass of PEG/SiO2-CPCM after multiple phase change cycles - Table 6 : Thermal conductivity of phase change concrete (W/m-K) - Fig. 1 : Preparatio flow of PEB/SiO2 composite shape-stabilized phase change material - Fig. 2 : Preparation of concrete test pieces - Fig. 3 : SEM graphs of SiO2 and PEG/SiO2 - Fig. 4 : Infrared spectrum graphs of PEG, SiO2 and PEG/SiO2-CPCM - Fig. 5 : DSC curves of PEG and PEG/SiO2-CPCM - Fig. 6 : Phase change concrete compressive strengh - Fig. 7 : Strength change of phase concrete DOI : https://doi.org/10.18280/rcma.290104 En ligne : https://www.iieta.org/download/file/fid/622 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34733 [article]

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Effect of human body temperature on new multilayer composite shield in pacemaker / Tahar Merizgui in REVUE DES COMPOSITES ET DES MATERIAUX AVANCES, Vol. 29, N° 1 (02/2019)  

[article]  inREVUE DES COMPOSITES ET DES MATERIAUX AVANCES > Vol. 29, N° 1 (02/2019) . - p. 27-32 Titre : Effect of human body temperature on new multilayer composite shield in pacemaker Type de document : texte imprimé Auteurs : Tahar Merizgui, Auteur ; Abdechafik Hadjadj, Auteur ; Mecheri Kious, Auteur ; Bachir Gaoui, Auteur Année de publication : 2019 Article en page(s) : p. 27-32 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Composites Conduction électrique Résistance thermique Silicium Stimulateurs cardiaques Structures multicouches Titane Index. décimale : 611.1 Appareil cardio-vasculaire Résumé : This paper presents a novel method for evaluating the effect of human body temperature on the electromagnetic shielding effectiveness (SE) of pacemaker. There are many sources of electromagnetic interference that interact with pacemakers: Cell phones may be considered responsible for electromagnetic interference EMI when they were held in the same part with the pacemaker; also, the magnetic resonance imaging makes a serious problem and must be avoided. In this paper, a new multilayer composite was prepared and built from alternating layers, the composite is reinforced by Titanium fibres and the dielectric layers made from the Silicon material, the dielectric layers are sandwiched between composites with Ti fibres symmetrically. Ti is the most widely used metal for pacemakers due to its high biocompatibility with the human body. Silicon has the advantages for being resistant material of temperature, lightweight, and its flexibility (bendable structure). The obtained simulation results prove the effectiveness of the proposed shield in the temperature range 37-41 °C. this is mainly due to the multi-reflection mechanism between the layers due to the high mismatched impedances. Note de contenu : - MODEL SETUP : Multi-layer structure composite as EMI shielding materials - The effect of temperature on the proposed multilayer composite - RESULTS AND DISCUSSION : The effect of temperature on EMI shielding properties - EM parameter analysis of the proposed sample - Table 1 : The electrical conductivity obtained from the proposed sample - Table 2 : EMI shielding performance of typical materials DOI : https://doi.org/10.18280/rcma.290105 En ligne : https://www.iieta.org/download/file/fid/640 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34734 [article]

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Experimental study on splitting performance of fiber reinforced asphalt concrete / Chunshui Huang in REVUE DES COMPOSITES ET DES MATERIAUX AVANCES, Vol. 29, N° 1 (02/2019)  

[article]  inREVUE DES COMPOSITES ET DES MATERIAUX AVANCES > Vol. 29, N° 1 (02/2019) . - p. 45-52 Titre : Experimental study on splitting performance of fiber reinforced asphalt concrete Type de document : texte imprimé Auteurs : Chunshui Huang, Auteur ; Faqi Chen, Auteur ; Danying Gao, Auteur Année de publication : 2019 Article en page(s) : p. 45-52 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Asphalte Béton renforcé de fibres Essais (technologie) Fibres polyesters Matériaux bitumineux Matériaux bitumineux -- Effets de la température Mélanges de fibres Revêtements (voirie) Séparation (technologie) Index. décimale : 711.7 Aménagement des zones réservées aux transports, routes, autoroutes... Résumé : The effects of temperature, fiber length and fiber mixing amount on the splitting performance of asphalt concrete were studied by the splitting test of different fiber mixing amount and length of fiber asphalt concrete at different temperatures. The effect mechanism of fiber on the splitting performance of asphalt concrete was analyzed. The relationship model between the split test parameters of fiber asphalt concrete and temperature, fiber length and fiber mixing amount were established. The results show that under the test conditions, the optimum length of polyester fiber is about 6mm, and the optimum dosage is about 0.2 %. Note de contenu : - Material and test - Effect of temperature on splitting performance - Effect of fiber length on splitting performance - Effect of fiber amount on splitting performance - Table 1 : Optimum asphalt amount - Table 2 : Splitting test results at different temperatures - Table 3 : Splitting test reseults for different fiber length - Table 4 : Splitting test results of different fiber amount - Fig. 1 : Relationship betweensplitting failure load and temperature - Fig. 2 : Failure forms of specimens - Fig. 3 : Typical splitting test process curve - Fig. 4 : Schematic diagram of fiber distribution on fracture surface DOI : https://doi.org/10.18280/rcma.290108 En ligne : https://www.iieta.org/download/file/fid/665 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34735 [article]

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Revue des composites et des matériaux avancés Vol. 29, N° 1 URL