1. Dynamic properties of dense sand-rubber mixtures with small particles size ratio
- Author
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Ali Daouadji, Abderahim Bali, El Mostafa Daya, Ali Brara, Ahmed Brara, Groupe de Recherche en Géomécanique ( GRG ), Géomécanique, Matériaux et Structures ( GEOMAS ), Institut National des Sciences Appliquées de Lyon ( INSA Lyon ), Université de Lyon-Institut National des Sciences Appliquées ( INSA ) -Université de Lyon-Institut National des Sciences Appliquées ( INSA ) -Institut National des Sciences Appliquées de Lyon ( INSA Lyon ), Université de Lyon-Institut National des Sciences Appliquées ( INSA ) -Université de Lyon-Institut National des Sciences Appliquées ( INSA ), Ecole Nationale Polytechnique [Alger] (ENP), Laboratoire d'Etude des Microstructures et de Mécanique des Matériaux (LEM3), Centre National de la Recherche Scientifique (CNRS)-Université de Lorraine (UL)-Arts et Métiers Sciences et Technologies, HESAM Université (HESAM)-HESAM Université (HESAM), Centre National d'Etudes et de Reherches Intégrées du Bâtiment (CNERIB), The experimental work described in this paper was carried out by Ali BRARA as part of his doctoral thesis at the laboratory LEM3 of Lorraine University of Metz. The experimental programme of this thesis (registered at the research unit URIE of Ecole Nationale Polytechnique) was carried out under the supervision of Dr Ali DAOUADJI during an 18-months stay funded by a grant awarded by the Algerian Ministry of Higher Education and Scientific Research., and Université de Lorraine (UL)-Centre National de la Recherche Scientifique (CNRS)-Arts et Métiers Sciences et Technologies
- Subjects
Damping ratio ,Environmental Engineering ,Materials science ,Wave propagation ,damping ratio ,0211 other engineering and technologies ,02 engineering and technology ,sand–rubber mixture ,Shear modulus ,Rigidity (electromagnetism) ,Natural rubber ,shear modulus ,021105 building & construction ,bender elements ,[ SPI.GCIV ] Engineering Sciences [physics]/Civil Engineering ,Composite material ,ComputingMilieux_MISCELLANEOUS ,021101 geological & geomatics engineering ,Civil and Structural Engineering ,triaxial cell ,Overburden pressure ,[SPI.GCIV]Engineering Sciences [physics]/Civil Engineering ,Shear (geology) ,visual_art ,Volume fraction ,visual_art.visual_art_medium ,shear wave - Abstract
International audience; In this study, the small strain shear modulus Gmax and the damping ratio Dmin of sand–rubber mixtures with a small particles size ratio Sr (D50rubber/D50sand = .36) are characterised by shear wave propagation using bender elements inserted in a modified triaxial cell. The influence of addition of less than 50% rubber volume fractions Rf in a range of confining pressures varying from 50 to 500 kPa was investigated. The results showed that, for all confining pressures, the shear modulus decreases with increasing rubber volume fractions, while the damping ratio linearly increases. A quasi-conservation of shear modulus up to a volume fraction Rf = .2 and sharp decrease beyond this content is observed. The shear modulus decay and the damping enhancement with addition of rubber fractions are mitigated by increasing confining pressures. An optimal increase of the damping ratio without significant loss of rigidity and a minimal sensitivity to confining pressure for mixtures containing about 10% rubber is highlighted. The shear modulus and damping ratio are power function of the mean effective stress within the range studied.
- Published
- 2016
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