Influence of various starch/hemp mixtures on mechanical and acoustical behavior of starch-hemp composite materials |
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| Affiliation: | 1. Laboratory of Civil Engineering, Université de Reims Champagne Ardenne, Moulin de la Housse, BP 1039, 51687 Reims Cedex 2, France;2. Laboratory of Thermo-Mechanics, GRESPI, Université de Reims Champagne Ardenne, Moulin de la Housse, BP 1039, 51687 Reims Cedex 2, France;1. Laboratoire GRESPI–Thermomécanique, Faculté des Sciences, Université de Reims Champagne Ardenne, 51687 Reims, France;2. LTI, EA 3899–Université de Picardie Jules Verne, IUT Amiens, Avenue des Facultés–Le Bailly, 80025 Amiens Cedex 1, France;1. Université Lille Nord de France, 59000 Lille, France;2. Université d’Artois, Laboratoire Génie-Civil et Géo-Environnement, 62400 Béthune, France;3. Carrières du Boulonnais, 62250 Ferques, France;1. MAST-CPDM, Univ Gustave Eiffel, IFSTTAR, F-77454 Marne-la-Vallée, France;2. CEREMA, Laboratory of Strasbourg, 11 rue Jean Mentelin, BP 9, 67035 Strasbourg Cedex 2, France;3. UMRAE, CEREMA, Univ Gustave Eiffel, IFSTTAR, F-67035 Strasbourg, France;4. University of Clermont Auvergne, Institut Pascal, UMR 6602, 63174 Aubière Cedex, France;1. Civil Engineering, University of Manitoba, 15 Gillson St., Winnipeg, Manitoba 3RT 5V6, Canada;2. Mechanical Power Department, Faculty of Engineering, Cairo University, Giza 12613, Egypt;1. Clermont Université, Institut Pascal, Polytech’ Clermont-Ferrand, 63174 Aubière Cédex, France;2. Ecole Nationale Supérieure d’Arts et Métiers, ENSAM Cluny, France;3. Centre Technique Louis VICAT, L''Isle d''Abeau, France;4. LGCGM, Université Rennes 1, Rennes, France;5. Université de Toulouse, UPS, INSA, LMDC (Laboratoire Matériaux et Durabilité des Constructions), Toulouse, France;6. BRE Centre for Innovative Construction Materials, University of Bath, Bath, UK;7. Paris-Est, IFSTTAR, MAST, Marne-La-Vallée, France;8. Department of Civil Engineering, Trinity College, Dublin, Ireland;9. Lhoist, Lhoist Recherche et Développement S.A., Belgium;10. Université de Bretagne Sud, 6: EA 4250, LIMatB, Lorient, F-56100, France;11. Queen’s University Belfast, School of Planning, Architecture & Civil Engineering, Belfast BT7 1NN, UK |
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| Abstract: | The starch-hemp composite materials are manufactured from the natural raw materials (water, starch and hemp shives) and a new durable material for construction and building. In this work, experimental investigation was carried out to study the mechanical and acoustical performance of starch-hemp composite materials. The starch-hemp composite materials specimens with five Hemp/Starch ratios (H/S = 6, 8, 10, 12 and 14), were manufactured by using the optimal binder and two hemp shives (0–15 mm and 0–20 mm). Density of the starch-hemp composite materials varies with the H/S ratio. The dry density for the starch-hemp composite materials is lower, between 163.6 kg/m3 and 169.1 kg/m3 in case of the hemp shives 0–15 mm and between 168.1 kg/m3 and 174.3 kg/m3 for the hemp shives 0–20 mm. The relation between stress and strain of the composite materials is not linear. The ultimate compressive stress can reach 0.55 MPa and the compressive strain is up to 30%. The results obtained by test show that the tensile strength depends strongly on the Hemp/Starch ratio and the hemp shives sizes. The variation of elasticity modulus and Poisson's ratio in function of the H/S ratio was also analyzed in this paper. The mechanism of the cracks or failure of the specimens was studied by using ARAMIS optical system. The study on acoustical behavior shows that the starch-hemp composite materials are a good sound absorber material for medium and high frequencies with a value around 0.7. The influence of the H/S ratio on the absorption coefficient is small. The results show that the starch-hemp composite materials have a good mechanical and acoustical performance and can be used as building materials. |
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| Keywords: | A. Fibers B. Mechanical properties C. Damage mechanics Binder |
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