New technology for alternative pozzolanic additions for Portland cement from abandoned landfi lls

In this study the technology of fly ash and slag from the old landfill reusing mas active mineral addition for cement manufacture is presented. The material of this landfill located in Spain, nearby the abandoned coal-fired power plant, was ground and separated in some fractions to study the possibility of use this waste as pozzolanic addition for Portland fly ash cement production. A laboratory-scale plant was designed for grinding and separation of this waste in four fractions with particle sizes ranging up 10 mm - 0.032 micron. The properties, chiefly pozzolanic behavior, of these fractions were examined. 25% of the fi nest fraction with unburnt carbon and after its separation, was added to Portland cement and compared with industrial Portland fly ash cement.Peer Reviewe