Comparison of One-Part and Two-Part Alkali-Activated Metakaolin and Blast Furnace Slag

One-part alkali-activated materials prepared with solid-form alkali activator are gaining attention in the construction industry, as they are an easier and safer approach for cast-in-situ applications in comparison with two-part approach (i.e., involving the use of alkali-activator solutions). The p...

Full description

Saved in:
Bibliographic Details
Published in:Journal of sustainable metallurgy 2022-12, Vol.8 (4), p.1816-1830
Main Authors: Segura, Isabel Pol, Luukkonen, Tero, Yliniemi, Juho, Sreenivasan, Harisankar, Damø, Anne Juul, Jensen, Lars Skaarup, Canut, Mariana, Kantola, Anu M., Telkki, Ville-Veikko, Jensen, Peter Arendt
Format: Article
Language:English
Subjects:
Aluminosilicates
Aluminum oxide
Aluminum silicates
Blast furnace practice
Blast furnace slags
Compressive strength
Construction industry
Earth and Environmental Science
Environment
Granulation
Heat of reaction
Metakaolin
Metallic Materials
NMR
Nuclear magnetic resonance
Research Article
Silicon dioxide
Slag
Spinning (materials)
Sustainable Development
Thermogravimetric analysis
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:One-part alkali-activated materials prepared with solid-form alkali activator are gaining attention in the construction industry, as they are an easier and safer approach for cast-in-situ applications in comparison with two-part approach (i.e., involving the use of alkali-activator solutions). The present study compares the one-part and conventional two-part mixing methods with two aluminosilicate precursors, metakaolin and ground granulated blast-furnace slag, using identical mix designs (in terms of molar ratios of SiO 2 , Al 2 O 3 , and Na 2 O) with both preparation methods. The results revealed that using one-part mix delays the setting time, increases the heat of reaction, decreases the shrinkage, and reaches between 80 and 85% of the compressive strength of the two-part mix. In addition, scanning electron microscopy, thermogravimetric analysis, and X-ray diffraction analysis showed no major differences between one- and two-part. However, energy-dispersive X-ray spectroscopy and magic angle spinning nuclear magnetic resonance experiments indicated that the extent of reaction in two-part alkali-activated mixes is higher than for one-part. Graphical Abstract
ISSN:2199-3823
2199-3831
DOI:10.1007/s40831-022-00606-9