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Pilot-scale road subbase made with granular material formulated with MSWI bottom ash and stabilized APC fly ash: environmental impact assessment
del Valle Zermeño, Ricardo; Formosa Mitjans, Joan; Prieto Fernández, Mario; Nadal Albiol, Ramon; Niubó Eslava, Maria; Chimenos Ribera, Josep Maria
Universitat Politècnica de Catalunya. Departament de Construccions Arquitectòniques II; Universitat Politècnica de Catalunya. GICITED - Grup interdisciplinar de ciència i tecnologia a l'Edificació
A granular material (GM) to be used as road sub-base was formulated using 80% of weathered bottom ash (WBA) and 20% of mortar. The mortar was prepared separately and consisted in 50% APC and 50% of Portland cement. A pilot-scale study was carried on by constructing three roads in order to environmentally evaluate the performance of GM in a real scenario. By comparing the field results with those of the column experiments, the overestimations observed at laboratory scale can be explained by the potential mechanisms in which water enters into the road body and the pH of the media. An exception was observed in the case of Cu, whose concentration release at the test road was higher. The long-time of exposure at atmospheric conditions might have favoured oxidation of organic matter and therefore the leaching of this element. The results obtained showed that immobilization of all heavy metals and metalloids from APC is achieved by the pozzolanic effect of the cement mortar. This is, to the knowledge of the authors, the only pilot scale study that is considering reutilization of APC as a safe way to disposal.
Peer Reviewed
Àrees temàtiques de la UPC::Edificació::Materials de construcció::Morter
Àrees temàtiques de la UPC::Enginyeria dels materials::Assaig de materials
MSWI bottom ash
APC residues
Field scale road
Granular material
Leaching study
Assaigs de materials
Morter (Material de construcció)
Attribution-NonCommercial-NoDerivs 3.0 Spain

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