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Title:Rapid immobilisation of chemical reactions in alkali-activated materials using solely microwave irradiation
Authors:ID Tesovnik, Anže (Author)
ID Horvat, Barbara (Author)
Files:URL URL - Source URL, visit http://hdl.handle.net/20.500.12556/DiRROS-20199
 
URL URL - Source URL, visit https://www.mdpi.com/2075-163X/14/12/1219
 
.pdf PDF - Presentation file, download (11,10 MB)
MD5: C8BB23FE3A42B17D8F776F1631CCEB80
 
Language:English
Typology:1.01 - Original Scientific Article
Organization:Logo ZAG - Slovenian National Building and Civil Engineering Institute
Abstract:Efflorescence, a time-dependent and water-driven phenomenon, is a major concern inalkali-activated materials (AAMs), impacting their practical use and preservation in a time-frozen state for post-characterisation. Although a method for stopping chemical reactions in conventional cements exists, it is time-consuming and not chemical-free. Therefore, this study explored the effects of low-power microwave-induced dehydration on efflorescence, mechanical performance, and structural integrity in AAMs, to create an alternative and more “user-friendly” dehydration method. For this purpose, several mixtures based on secondary raw (slag, fly ash, glass wool, and rock wool) and non-waste (metakaolin) materials were activated with a commercial Na-silicate solution in ratios that promoted or prevented efflorescence. Characterisation techniques, including Fourier-transform infrared spectroscopy and X-ray diffraction, showed that microwave dehydration effectively removed water without altering crystallinity, while mercury intrusion porosimetry and compressive strength tests confirmed increased porosity. In addition to being an efficient, time-saving, and solvent-free manner of stopping the reactions in AAMs, microwave irradiation emerged as an innovative, chemical-free method for evaluating curing finalisation and engineering foams in a stage when all other existing methods fail. However, the artificially provoked efflorescence in aged dehydrated AAMs connected the slipperiness of AAM with the instant extraction of Na, which raised the need for further research into alternative alkali replacements to evaluate the practical use of AAM.
Keywords:materials chemistry, alkali-activated materials, geopolymers, slag, fly ash, rock wool, glass wool, metakaolin, microwave irradiation, dehydration, stopping chemical reactions, efflorescence
Publication status:Published
Publication version:Version of Record
Publication date:29.11.2024
Publisher:MDPI AG
Year of publishing:2024
Number of pages:str. 1-30
Numbering:Vol. 14, iss. 12, [article no.] 1219
PID:20.500.12556/DiRROS-21107 New window
UDC:54
ISSN on article:2075-163X
DOI:10.3390/min14121219 New window
COBISS.SI-ID:217643779 New window
Copyright:© 2024 by the authors.
Publication date in DiRROS:23.12.2024
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Downloads:7
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Record is a part of a journal

Title:Minerals
Shortened title:Minerals
Publisher:MDPI AG
ISSN:2075-163X
COBISS.SI-ID:519985177 New window

Document is financed by a project

Funder:ARIS - Slovenian Research and Innovation Agency
Project number:J2-3035
Name:Sinteza alkalijsko aktiviranih materialov s pomočjo mikrovalov

Licences

License:CC BY 4.0, Creative Commons Attribution 4.0 International
Link:http://creativecommons.org/licenses/by/4.0/
Description:This is the standard Creative Commons license that gives others maximum freedom to do what they want with the work as long as they credit the author.

Secondary language

Language:Slovenian
Keywords:kemija materialov, alkalijsko aktivirani materiali, geopolimeri, žlindra, elektrofiltrski pepel, kamena volna, steklena volna, metakaolin, mikrovalovno obsevanje, dehidracija, zaustavljanje kemijskih reakcij, rast soli


Collection

This document is a collection and includes these documents:
  1. Dehydration with microwave irradiation
This document is a part of these collections:
  1. Dehydration with microwave irradiation

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