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Manufacture of artificial aggregate using MSWI bottom ash
R Cioffi1, F Colangelo, F Montagnaro
1Dipartimento per le Tecnologie, Università di Napoli Parthenope, Centro Direzionale Is. C4, Napoli, Italy. raffaele.cioffi@uniparthenope.it
Waste Management (New York, N.Y.)
|June 23, 2010
Summary
This study demonstrates that bottom ash from municipal solid waste incineration can be processed into artificial aggregate. This lightweight aggregate, produced via stabilization/solidification, is suitable for manufacturing concrete blocks.
Area of Science:
- Materials Science
- Environmental Engineering
- Waste Management
Background:
- Municipal solid waste incineration produces bottom ash, a significant waste stream.
- Effective management of bottom ash is crucial for resource recovery and landfill reduction.
Purpose of the Study:
- To investigate the material recovery of bottom ash through stabilization/solidification.
- To produce and characterize artificial aggregate from bottom ash for potential construction applications.
Main Methods:
- Bottom ash was milled and granulated at room temperature with hydraulic binders (cement, lime, coal fly ash).
- Various mixes with 60-90% bottom ash content were tested.
- Granules were evaluated for density, water absorption, compressive strength, and heavy metal leaching.
Main Results:
- The produced granules qualify as lightweight aggregate.
- Mechanical strength was significantly influenced by the binder type.
- Concrete incorporating the artificial aggregate demonstrated suitability for standard concrete blocks.
Conclusions:
- Stabilization/solidification is an effective method for transforming bottom ash into usable artificial aggregate.
- The developed artificial aggregate shows promise for sustainable construction materials.
- Further research can optimize binder formulations for enhanced aggregate properties.
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