Evaluation of the influence of mechanical activation on physical and chemical properties of municipal solid waste incineration sludge

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Abstract

Despite numerous studies concerning the application of by-products in the construction field, municipal solid waste incineration (MSWI) residues are not widely used as secondary building materials. In some European countries, washing treatment to the full bottom ash (BA) fraction (0-32 mm) is applied, isolating more contaminated particles, smaller than 0.063 mm. Therefore, a MWSI sludge is produced, having a high moisture content, and thus a limited presence of soluble species. In order to enhance its performance as building material, here, dry mechanical activation is applied on MSWI sludge. Thereafter, a reactivity comparison between reference BA and untreated and treated MSWI sludge is provided, evaluating their behaviour in the presence of cement and their pozzolanic activity. Moreover, the mechanical performances, as 25% substitution of Portland cement (PC) are assessed, based on the EN 450. Mechanical activation enhances MSWI sludge physically due to the improved particle morphology and packing. Chemically, the hydration degree of PC is enhanced by the MSWI sludge by ≈25%. The milling treatment proved to be beneficial to the residues performances in the presence of PC, providing 32% higher strength than untreated sample. Environmentally, the compliance with the unshaped material legislation is successfully verified, according to the Soil Quality Decree.

Original languageEnglish
Pages (from-to)133-144
Number of pages12
JournalJournal of Environmental Management
Volume216
DOIs
Publication statusPublished - 15 Jun 2018

Keywords

  • Leaching
  • Mechanical activation
  • MSWI sludge
  • Reactivity
  • Construction Materials
  • Sewage
  • Coal Ash
  • Incineration
  • Europe
  • Refuse Disposal
  • Solid Waste

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