APC Fly Ash Recycling Development of a Granular M

Authors: R del ValleZermeño J GiroPaloma J Formosa J M Chimenos

Publish Date: 2016/08/03

Volume: 8, Issue: 5, Pages: 1409-1419

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Abstract

The aim of this article is to present the research carried out over a 10 year period to develop an environmentally safe method for recycling air pollution control APC residues The initial studies aimed to formulate a mixture of weathered bottom ash WBA APC residues and Portland cement PC to be used as a subbase in road constructions Mechanical performance was subsequently enhanced by preparing a mortar prior to mixing it with WBA in order to obtain a granular material After testing different formulations the optimum mortar consisted of 50  APC residues and 50  PC The evaluation was carried out based on the concentration release of the heavy metals and metalloids included in the Catalan legislation for revalorization of residues After the applicability of the granular material was successfully demonstrated at laboratory scale from an environmental and mechanical point of view a pilot scale plant was designed in order to assess its performance in a real scenario during 4 month Thus three roads were built two containing 100  granular material and a third containing 100  WBA The results showed that the immobilisation of all toxic species from APC residues is accomplished by the pozzolanic effect of the cement The WBA APC and PC proportions show to be the most appropriate for compliance with regard to environmental and mechanics requirementsThe authors would like to thank the SIRUSA and VECSA companies for their financial support and for providing access to sampling sites Dr Ricardo del Valle Zermeño is grateful to the Government of Catalonia for the research grant FIDGR 2014 The authors would like to thank the Catalan Government for the quality accreditation given to their research group DIOPMA 2014 SGR 1543 Dr Jessica GiroPaloma appreciate the financial support to Fundació Agustí Pedro i Pons for the granted fellowship Thanks are also given to Mrs Judit Gómez for the assistance with chemical analysis and data management

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