Alberto Ferraro (Author), Vilma Ducman (Author), Francesco Colangelo (Author), Lidija Korat (Author), Danilo Spasiano (Author), Ilenia Farina (Author)

Abstract

The performance of a cold-bonding pelletization process was investigated for lightweight aggregates (LWAs) production from municipal solid waste incineration (MSWI) fly-ash (FA), by including multiple waste materials in the aggregate mixture. Before pelletization, FA was pre-treated by washing with water, which led to a reduction of chloride (66.79%) and sulphate (25.30%) content. This was further confirmed by XRF and XRD analyses, which showed a reduction of chloride elements and the content of chlorine crystalline phases. The pelletization process was carried out using both single- and double-step methods. For single-step pelletization, all the mixtures contained 80% FA, combined with various compositions of cement (5, 10, and 15%) and granulated blast furnace slag (GBFS) (5, 10, and 15%). For the double-step pelletization 30% of cement and 70% of marble sludge (MS) were added to each of the previous mixtures. The apparent density of all the aggregates varied between 1.60 and 1.87 g cm 3, suggesting their suitability to be classified as LWAs. Aggregates produced from double-step pelletization showed improved characteristics, with water absorption capacity and open porosity generally lower compared to the corresponding aggregates from the single-step pelletization. The best values of compressive (crushing) strength (almost 11 MPa) were observed for double-step pelletization aggregates with initial cement: GBFS mixture of 15%:5%. Results from leaching tests showed an overall significant release of chloride and sulphate. Nevertheless, leaching from double-step pelletization aggregates was reduced by 1.73- 4.02 times for chloride and 1.58-5.67 times for sulphate, further suggesting that better performances are achievable through the addition of an aggregate second layer.

Keywords

MSWI pepel;lahki agregat;mikrotomografija;odprti dostop;MSWI fly ash;lightweight aggregate;microtomography;open access;

Data

Language: English
Year of publishing:
Typology: 1.01 - Original Scientific Article
Organization: ZAG - Slovenian National Building and Civil Engineering Institute
Publisher: Elsevier
UDC: 620.1/.2
COBISS: 133711363 Link will open in a new window
ISSN: 1879-1786
Views: 11
Downloads: 7
Average score: 0 (0 votes)
Metadata: JSON JSON-RDF JSON-LD TURTLE N-TRIPLES XML RDFA MICRODATA DC-XML DC-RDF RDF

Other data

Secondary language: Slovenian
Secondary keywords: MSWI pepel;lahki agregat;mikrotomografija;odprti dostop;
Source comment: Nasl. z nasl. zaslona; Opis vira z dne 13. 12. 2022; Št. članka: 135275;
Pages: str. 1-11
Issue: ǂVol. ǂ383
Chronology: 10 Jan. 2023
DOI: 10.1016/j.jclepro.2022.135275
ID: 18788301