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Title:Alternative alkali activators based on waste bottle glass and waste cathode-ray tube glass
Authors:ID Koenig, Katja (Author)
ID Traven, Katja (Author)
ID Ducman, Vilma (Author)
Files:.pdf PDF - Presentation file, download (14,96 MB)
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URL URL - Source URL, visit https://www.zag.si/dl/coms2020-21-proceedings-2-rev.pdf
 
Language:English
Typology:1.08 - Published Scientific Conference Contribution
Organization:Logo ZAG - Slovenian National Building and Civil Engineering Institute
Abstract:Alkali-activated binders are an environmentally friendly alternative to Portland cement, particularly when locally-available raw materials are used. It is well known that alkali activation with a sodium silicate activator generates a hardened binder with higher compressive strength than a binder hardened with sodium hydroxide. As the alkali-silicate activators are produced through energy extensive processes, and their use can significantly increase the carbon footprint of the final products, it is of great significance to develop alternative alkaline activators based on locally-available waste materials. This article assesses the potential to apply waste bottle glass and waste cathode-ray tube (CRT) glass to synthesise alternative alkali activators by the hydrothermal method. Inductively coupled plasma-optical emission spectrometry (ICP-OES) was used to determine silicon and aluminium content in the alternative activators. The influence of dissolution process parameters (time, temperature, particle size) on the concentrations of silicon and aluminium in the alternative activators was investigated. The alternative activators with silicon concentration up to 19 g/L and aluminium concentration up to 0.9 g/L were prepared at T = 120 °C and boiling time 24 h. The alternative alkali activators and, for comparison, also commercial sodium silicate were used in the alkali activation of fly ash powder. The formed pastes were cured at 70 °C for 72 h. Mechanical strength measurements indicated that alkali activation of fly ash with the optimal alternative activator yielded hardened paste with compressive strength of 33 MPa. However, the compressive strength of hardened paste prepared from fly ash and commercial sodium silicate reached 70 MPa. Part of this difference can be ascribed to the lower density of hardened pastes prepared with alternative activators.
Keywords:alkali -activated materials, alternative alkali activators, waste bottle glass, waste cathode -ray tube glass, fly ash, hydrothermal method
Publication status:Published
Publication version:Version of Record
Publication date:01.01.2021
Publisher:Slovenian National Building and Civil Engineering Institute
Year of publishing:2021
Number of pages:Str. 93-100
PID:20.500.12556/DiRROS-17974 New window
UDC:624
COBISS.SI-ID:69350659 New window
Copyright:© 2021 Slovenian National Building and Civil Engineering Institute, Ljubljana 2021
Note:Nasl. z nasl. zaslona; Opis vira z dne 6. 7. 2021;
Publication date in DiRROS:25.01.2024
Views:695
Downloads:432
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KOENIG, Katja, TRAVEN, Katja and DUCMAN, Vilma, 2021, Alternative alkali activators based on waste bottle glass and waste cathode-ray tube glass. In : Construction materials for a sustainable future [online]. Published Scientific Conference Contribution. Ljubljana : Slovenian National Building and Civil Engineering Institute. 2021. p. 93–100. [Accessed 17 March 2025]. Retrieved from: https://dirros.openscience.si/IzpisGradiva.php?lang=eng&id=17974
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Record is a part of a monograph

Title:Construction materials for a sustainable future : proceedings of the 2nd International Conference CoMS 2020/21
Editors:Aljoša Šajna, Andraž Legat, Sabina Jordan, Petra Horvat, Ema Kemperle, Sabina Dolenec, Metka Ljubešek, Matej Michelizza
Place of publishing:Ljubljana
Publisher:Slovenian National Building and Civil Engineering Institute
Year of publishing:2021
ISBN:978-961-7125-03-0
COBISS.SI-ID:68189443 New window

Document is financed by a project

Funder:ARRS - Slovenian Research Agency
Project number:J2-9197
Name:Sinteza in karakterizacija alkalijsko aktiviranih pen na osnovi odpadnih materialov

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License:CC BY-NC-ND 4.0, Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International
Link:http://creativecommons.org/licenses/by-nc-nd/4.0/
Description:The most restrictive Creative Commons license. This only allows people to download and share the work for no commercial gain and for no other purposes.

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