APC fly ashes stabilized with Portland cement for further development of road sub-base aggregates
| Autor: | Josep Maria Chimenos, A. Maldonado-Alameda, Joan Formosa, S. Huete-Hernández, J. Giro-Paloma |
|---|---|
| Přispěvatelé: | Universitat de Barcelona |
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
Flue gas
Municipal solid waste Materials de construcció Portland cement Recuperació de residus Cement 0211 other engineering and technologies Building material 02 engineering and technology Incineration Ciment 010501 environmental sciences engineering.material 01 natural sciences law.invention Ciment pòrtland law Leachate Recovery of waste products 0105 earth and related environmental sciences 021110 strategic defence & security studies Waste management Bottom ash Fly ash Building materials engineering Environmental science Incineració |
| Zdroj: | Recercat. Dipósit de la Recerca de Catalunya instname Dipòsit Digital de la UB Universidad de Barcelona |
| Popis: | Although waste-to-energy plants allow reducing the mass and volume of municipal solid waste (MSW) incinerated, an average around 30 % of the total content remains as bottom ash (BA) and air pollution control (APC) ashes at the end of combustion process. While weathered bottom ash (WBA) is considered a non-hazardous residue that can be revalorized as a secondary aggregate, APC fly ashes generated during the flue gas treatment are classified as hazardous waste and are handled in landfill disposal after stabilization, usually with Portland cement (OPC). However, taking into account the amount of APC residues produced and the disposing cost in landfill, their revalorization is an important issue that could be effectively addressed. As MSW can be incinerated producing bottom ashes (BA) or air pollutant control (APC) residues, the development of a mortar formulated with APC fly ash as secondary building material is a significant risk to the environment for their content of heavy metals. In this way, Design of Experiment (DoE) was used for the improvement of granular material (GM) formulation composed by APC and OPC for further uses as road sub-base aggregate. DoE analysis was successful in the modelling and optimization the formulation as function of the mechanical properties and APC amount. Consequently, an optimal mortar formulation (OMF) of around 50 wt.% APC and 50 wt.% OPC was considered. The OMF leachates and abrasion resistance have been analyzed. These results have demonstrated the viability of OMF as non-hazardous material feasible to be used as secondary aggregate. Moreover, it would be possible to consider the environmental assessment of a GM composed by ≈20 wt.% of OMF and ≈80 wt.% of WBA in order to improve mechanical properties and heavy metals stabilization. |
| Databáze: | OpenAIRE |
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