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  Global Journal of Environmental Science and Technology 2011, 1: 18
  Research Article
 
Experimental assessment of the cyclic mechanical performances of a municipal solid waste incinerator bottom ash
  Fabrice Bernarda, Frédéric Becquartb, Nor-Edine Abriakc, Daniel Zakrzewskid  
     
a Institut National des Sciences Appliquées, Laboratory of Civil and Mechanical Engineering, 20 Avenue des Buttes de Coësmes, 35708 Rennes Cedex 7, France
b Ecole des Mines de Douai, Civil and Environmental Engineering Department, 941 rue Charles Bourseul, 59508 Douai Cedex, France. Now at Ecole Supérieure d’Ingénieurs des Travaux de la Construction, LRMC, Campus 2-1 rue Pierre et Marie Curie, 14610 Epron, France
c Ecole des Mines de Douai, Civil and Environmental Engineering Department, 941 rue Charles Bourseul, 59508 Douai Cedex, France
d Ecole des Mines de Douai, Polymers and Composites Technology & Mechanical engineering Department, 941 rue Charles Bourseul, 59508 Douai Cedex, France

   
  Abstract  
  The recycling of Municipal Solid Waste Incineration (MSWI) bottom ashes in road structures is investigated in this paper. The by-product concerned in this work comes from an incineration plant of the North of France. Previous papers concerning this way of recycling have shown that the waste has a weak polluting potential, good geotechnical characteristics (enabling to conclude that the bottom ash behaves like a natural gravel, insensitive to water, non-cohesive and permeable) as well as satisfactory static mechanical performances (under oedometric and shear triaxial loadings). In order to go ahead in the study of the mechanical behaviour of MSWI bottom ashes, cyclic mechanical tests have been performed for the first time ever and are presented in this paper. Special experimental procedures have been developed. This new experimental campaign enables to develop a damage model by plastic strains accumulation for the unbound MSWI bottom ash and a damage model by fatigue for the waste treated by hydraulic binder, as prescribed in the French specifications for the pavement design. Experimental relationships giving the evolution of elastic and plastic strains in function of the applied stresses have thus been proposed for the unbound material. The decrease of the bending failure in function of the load cycles number has also been determined for the MSWI bottom ash treated with 5% cement. It can be finally concluded that the MSWI bottom ash can be considered as a new durable resource for road engineering, even for structural layers. However the present results have to be taken into account in the design phases.
     
  Keywords  
  MSWI bottom ash; Cyclic mechanical behavior; Performance-based design; Hydraulic binder  
     
   
   
   
   
     

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