37º IAHS World Congress on Housing: - Universidad de Cantabria

XXXVII <strong>IAHS</strong><strong>World</strong> <strong>Congress</strong> on HousingOctober 26 – 29, 2010, Santander, SpainCODE: 921INFLUENCE OF THE CDW’S TREATMENT PROCESS ONTHE CHARACTERISTICS OF MIXED RECYCLEDAGGREGATES FOR NON-STRUCTURAL CONCRETEI. J. Vegas 1 , A. Lisbona 1 , M. Sanchez de Juan 2 , M.D. Carvajal 31Construction UnitLABEIN-TECNALIA, Spainijvegas@labein.es alisbona@labein.es2Structures and Materials LaboratoryCEDEX, SpainMarta.Sanchez@cedex.es3R&D DepartmentSACYR SAU, Spainmdcarvajal@gruposyv.comKey words: construction and demolition waste, mixed recycled aggregates, physical-chemicalcharacterization, treatment technologies, CDW treatment plantsAbstractConstruction and Demolition Waste (CDW) has dramatically increased in Spain over the pastfew years. Likewise, the production of recycled aggregates has prompted new pre-regulationdevelopment to encourage their use in non-structural concrete.The objective of this work is to study the relationship between production technology inCDW treatment plants and the properties of the final mixed recycled aggregate they produce.An experimental program has been carried out, including physical-mechanical and chemicalcharacterization of samples taken from several mixed recycled aggregates. Different Spanishplants and their treatment systems have been selected for analysis in this study.It is concluded that the production technology at the plant is related to the characteristics ofthe recycled aggregate. Thus, gypsum content depends on the number of manual sortingstages, whereas lightweight particle content depends on the number of pneumatic separators.Finally, the shape index depends on the number of crushing steps and the number of screeningpoints.37º <strong>IAHS</strong> <strong>World</strong> <strong>Congress</strong> On Housing Science 298