1. How Properties of Kenaf Fibers from Burkina Faso Contribute to the Reinforcement of Earth Blocks
- Author
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Erwan Hamard, Younoussa Millogo, Jean-Claude Morel, Jean-Emmanuel Aubert, Université Joseph Ki-Zerbo [Ouagadougou] (UJZK), Laboratoire Matériaux et Durabilité des constructions (LMDC), Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA), Granulats et Procédés d'Elaboration des Matériaux (IFSTTAR/MAST/GPEM), Institut Français des Sciences et Technologies des Transports, de l'Aménagement et des Réseaux (IFSTTAR)-PRES Université Nantes Angers Le Mans (UNAM), Laboratoire de Tribologie et Dynamique des Systèmes (LTDS), École Centrale de Lyon (ECL), Université de Lyon-Université de Lyon-École Nationale des Travaux Publics de l'État (ENTPE)-Ecole Nationale d'Ingénieurs de Saint Etienne-Centre National de la Recherche Scientifique (CNRS), Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT), and Université de Lyon-Université de Lyon-École Nationale des Travaux Publics de l'État (ENTPE)-Ecole Nationale d'Ingénieurs de Saint Etienne (ENISE)-Centre National de la Recherche Scientifique (CNRS)
- Subjects
Thermogravimetric analysis ,Materials science ,FIBRE ,0211 other engineering and technologies ,physicochemical characteristics ,Modulus ,Video microscopy ,02 engineering and technology ,mechanical properties ,lcsh:Technology ,PROPRIETE MECANIQUE ,Article ,[SPI.MAT]Engineering Sciences [physics]/Materials ,chemistry.chemical_compound ,TERRE VEGETALE ,[SPI]Engineering Sciences [physics] ,Flexural strength ,021105 building & construction ,Ultimate tensile strength ,Burkina Faso ,General Materials Science ,Fiber ,BIOMATERIAU ,kenaf fibers ,Cellulose ,Composite material ,lcsh:Microscopy ,CARACTERISATION PHYSICO CHIMIQUE ,lcsh:QC120-168.85 ,[SDV.EE]Life Sciences [q-bio]/Ecology, environment ,biology ,lcsh:QH201-278.5 ,lcsh:T ,FIBRE DE KENAF ,TERRE ,021001 nanoscience & nanotechnology ,biology.organism_classification ,Kenaf ,Earth blocks ,chemistry ,lcsh:TA1-2040 ,lcsh:Descriptive and experimental mechanics ,lcsh:Electrical engineering. Electronics. Nuclear engineering ,0210 nano-technology ,lcsh:Engineering (General). Civil engineering (General) ,lcsh:TK1-9971 ,CARACTERISTIQUE - Abstract
Physicochemical characteristics of Hibiscus cannabinus (kenaf) fibers from Burkina Faso were studied using X-ray diffraction (XRD), infrared spectroscopy, thermal gravimetric analysis (TGA), chemical analysis and video microscopy. Kenaf fibers (3 cm long) were used to reinforce earth blocks, and the mechanical properties of reinforced blocks, with fiber contents ranging from 0.2 to 0.8 wt%, were investigated. The fibers were mainly composed of cellulose type I (70.4 wt%), hemicelluloses (18.9 wt%) and lignin (3 wt%) and were characterized by high tensile strength (1 ± 0.25 GPa) and Young’s modulus (136 ± 25 GPa), linked to their high cellulose content. The incorporation of short fibers of kenaf reduced the propagation of cracks in the blocks, through the good adherence of fibers to the clay matrix, and therefore improved their mechanical properties. Fiber incorporation was particularly beneficial for the bending strength of earth blocks because it reinforces these blocks after the failure of soil matrix observed for unreinforced blocks. Blocks reinforced with such fibers had a ductile tensile behavior that made them better building materials for masonry structures than unreinforced blocks.
- Published
- 2015
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