Effect of drying temperature on the properties of alkali-activated binders - Recommendations for sample preconditioning

Various durability tests require a drying step to remove free water without altering the chemistry or microstructure of the materials. However, little is known about the effects of drying on alkali-activated materials (AAMs). This study focusses on the drying stage to assess the behaviour of four al...

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Bibliographic Details
Published in:Cement and concrete research 2022-01, Vol.151, p.106617, Article 106617
Main Authors: Trincal, Vincent, Benavent, Virginie, Lahalle, Hugo, Balsamo, Bastien, Samson, Gabriel, Patapy, Cédric, Jainin, Yoann, Cyr, Martin
Format: Article
Language:English
Subjects:
Activated carbon
Alkali-activated binder
Blast furnace chemistry
Blast furnace practice
Civil Engineering
Drying
Drying conditions
Engineering Sciences
Geopolymer
Geopolymers
GGBS
Granulation
Metakaolin
Mortars (material)
Preconditioning
Sodium carbonate
Sodium silicates
Structural damage
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Summary:Various durability tests require a drying step to remove free water without altering the chemistry or microstructure of the materials. However, little is known about the effects of drying on alkali-activated materials (AAMs). This study focusses on the drying stage to assess the behaviour of four alkali-activated binders compared with conventional binders: a metakaolin-based geopolymer, ground granulated blast-furnace slag (GGBS) activated by sodium silicate or by sodium carbonate, and a mixture of metakaolin-GGBS activated by sodium silicate. After a 28-day autogenous cure, mortar and paste samples were dried at temperatures ranging between 20 °C and 125 °C. Micro-structural damage was observed in metakaolin-based AAMs dried at temperatures above 40 °C, but occurred only between 40 and 60 °C for GGBS-based AAMs. SEM observations and MIP porosimetry coupled with mineralogical analyses, allowed AAMs drying mechanisms to be better understood, and recommendations to be made for the preconditioning of these materials.
ISSN:0008-8846
1873-3948
DOI:10.1016/j.cemconres.2021.106617