Katja Koenig (Author), Katja Traven (Author), Majda Pavlin (Author), Vilma Ducman (Author)

Abstract

The production of alkali-activated materials with excellent mechanical performance requires the use of waterglass, which has a significant carbon footprint. Such materials can have a lower carbon footprint if we replace water glass with alternative activators sourced from waste. In this study, we assessed the suitability of locally available amorphous waste materials (stone wool, glass wool, bottle glass and cathode-ray tube glass) as a source for the preparation of alternative alkali activators. We quantified the amount of silicon and aluminium dissolved in the activator solutions via inductively coupled plasma-optical emission spectrometry. The alternative activators were then used to produce alkali-activated fly ash and slag. The compressive strength values of alkali-activated fly ash specimens upon the addition of NaOH, water glass and the most promising alternative activator were 38.98 MPa, 31.34 MPa and 40.37 MPa, respectively. The compressive strength of slag specimens activated with alternative activators with the highest concentration of dissolved silicon (21 g/L) was, however, 70% higher than the compressive strength of slag specimens activated with only 10 M sodium hydroxide. The compressive strength of slag specimens with the addition of the most promising alternative activator was significantly lower (3.5 MPa) than the compressive strength of those that had been activated by commercial water glass (34.3 MPa).

Keywords

alkalijsko aktivirani materiali;alternativni aktivatorji;lastnosti;odprti dostop;alkali activated materials/geopolimers;alternative activators;properties;open access;

Data

Language: English
Year of publishing:
Typology: 1.01 - Original Scientific Article
Organization: ZAG - Slovenian National Building and Civil Engineering Institute
Publisher: Ceramurgica s.p.a.
UDC: 620.1/.2
COBISS: 32752643 Link will open in a new window
ISSN: 0272-8842
Views: 10
Downloads: 3
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Other data

Source comment: E-članek objavljen: 15 February 2021;
Pages: str. 4864-4873
Volume: ǂVol. ǂ47
Issue: ǂiss. ǂ4
Chronology: 2021
DOI: 10.1016/j.ceramint.2020.10.059
ID: 19833957