Journal
WASTE MANAGEMENT
Volume 120, Issue -, Pages 114-124Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.wasman.2020.11.034
Keywords
MSWI fly ash; Chemical composition; Chloride; Pozzolanic activity; Eco-cements
Categories
Funding
- Diputacion Foral de Gipuzkoa [82/17]
- University of the Basque Country, UPV/EHU [PPG17/22]
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The study aims to explore the feasibility of using municipal solid waste incinerator (MSWI) fly ash as raw material for sintering belite cements. Results show that MSWI fly ashes have suitable composition, but proper pre-treatment is required to eliminate chloride and heavy metal traces, and to enhance pozzolanic activity. Additionally, the addition of vitreous silica in proper proportions is necessary.
Municipal solid waste incinerator (MSWI) fly ash is a residue of municipal solid waste incineration whose recycling is currently a worldwide problem. Therefore, considerable efforts are being made to establish effective recovery techniques so MSWI can be used as a substitute for natural resources in construction, as in masonry blocks, roads and so on, or in the manufacture of new materials. MSWI fly ashes contain elements such as Ca, Si and Al, which make it possible for them to be used as raw material to manufacture cements. This paper presents the results obtained from the physicochemical characterization of two MSWI fly ashes from two Spanish cities. The research aims to explore the feasibility of using MSWI fly ash as raw material for sintering belite cements. The results show that MSWI fly ashes have a suitable composition. However, appropriate pre-treatment will be required to eliminate chloride and possible traces of heavy metals and to improve pozzolanic activity. Furthermore, the addition of vitreous silica in the proper proportions is required. The phases generated after calcination of the blend at 800 degrees C are not those corresponding to pure belite cements. Nevertheless, the possibility of using these ashes as supplementary cementitious material in the manufacture of eco-cements should be contemplated. (C) 2020 Elsevier Ltd. All rights reserved.
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