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Title: Use of weathered and fresh bottom ash mix layers as a subbase in road constructions: environmental behavior enhancement by means of a retaining barrier
Author: Valle Zermeño, Ricardo del
Chimenos Ribera, Josep Ma.
Giró Paloma, Jessica
Formosa Mitjans, Joan
Keywords: Incineració
Metalls pesants
Materials de construcció
Contaminació de l'aigua
Heavy metals
Building materials
Water pollution
Issue Date: 31-Aug-2014
Publisher: Elsevier Ltd
Abstract: The presence of neoformed cement-like phases during the weathering of non-stabilized freshly quenched bottom ash favours the development of a bound pavement material with improved mechanical properties. Use of weathered and freshly quenched bottom ash mix layers placed one over the other allowed the retention of leached heavy metals and metalloids by means of a reactive percolation barrier. The addition of 50% of weathered bottom ash to the total subbase content diminished the release of toxic species to below environmental regulatory limits. The mechanisms of retention and the different processes and factors responsible of leaching strongly depended on the contaminant under concern as well as on the chemical and physical factors. Thus, the immediate reuse of freshly quenched bottom ash as a subbase material in road constructions is possible, as both the mechanical properties and long-term leachability are enhanced.
Note: Versió postprint del document publicat a:
It is part of: Chemosphere, 2014, vol. 117, num. 1, p. 402-409
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ISSN: 0045-6535
Appears in Collections:Articles publicats en revistes (Ciència dels Materials i Química Física)

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