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Materials (Basel). 2013 Aug 12;6(8):3420-3437. doi: 10.3390/ma6083420.

Recycling of Pre-Washed Municipal Solid Waste Incinerator Fly Ash in the Manufacturing of Low Temperature Setting Geopolymer Materials.

Author information

1
INSTM Parthenope Research Unit, Department of Engineering, University of Naples Parthenope, Centro Direzionale Is. C4, Naples 80143, Italy. claudio.ferone@uniparthenope.it.
2
INSTM Parthenope Research Unit, Department of Engineering, University of Naples Parthenope, Centro Direzionale Is. C4, Naples 80143, Italy. colangelo@uniparthenope.it.
3
INSTM Parthenope Research Unit, Department of Engineering, University of Naples Parthenope, Centro Direzionale Is. C4, Naples 80143, Italy. francesco.messina@uniparthenope.it.
4
Department of Chemical Sciences, University of Naples Federico II, Monte Sant'Angelo Complex, Naples 80126, Italy. luciano.santoro@unina.it.
5
INSTM Parthenope Research Unit, Department of Engineering, University of Naples Parthenope, Centro Direzionale Is. C4, Naples 80143, Italy. rcioffi@uniparthenope.it.

Abstract

In this work, three samples of municipal solid waste incinerators fly ash (MSWI-FA) have been stabilized in systems containing coal fly ash to create geopolymers through a polycondensation reaction. Monolithic products have been obtained with both MSWI fly ash as received and after the partial removal of chloride and sulfate by water washing. The polycondensation products have been characterized qualitatively by means of Fourier transform infrared spectroscopy, X-ray diffraction and scanning electron microscopy and quantitatively, through the determination of the volume of reacted water and silicate. Furthermore, the heavy metals and chloride releases together with the physico-mechanical properties have been evaluated on the hardened products. In conclusion, considering the technological and environmental performances of the obtained geopolymers, they could be suitable for many non-structural applications, such as backfilling of abandoned quarries, decorative materials or brick fireplaces, hearths, patios, etc.

KEYWORDS:

coal fly ash; geopolymer bricks; municipal solid waste incinerator fly ash; stabilization; washing treatment

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