Improving the pozzolanic reactivity of clay, marl and obsidian through mechanochemical or thermal activation

This research investigated the physicochemical properties and pozzolanic reactivity of mechanochemically and thermally treated clay, marl, and obsidian as supplementary cementitious materials (SCMs). The results suggest that the mechanochemical treatment of clay and marl resulted in delamination, de...

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Bibliographic Details
Published in:Materials and structures 2024-02, Vol.57 (1), Article 9
Main Authors: Baki, Vahiddin Alperen, Ke, Xinyuan, Heath, Andrew, Calabria-Holley, Juliana, Terzi, Cemalettin
Format: Article
Language:English
Subjects:
Activated clay
Building Materials
Calcite
Carbonates
Civil Engineering
Clay minerals
Comminution
Engineering
High temperature
Machines
Manufacturing
Marl
Materials Science
Obsidian
Original Article
Processes
Roasting
Solid Mechanics
Theoretical and Applied Mechanics
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Summary:This research investigated the physicochemical properties and pozzolanic reactivity of mechanochemically and thermally treated clay, marl, and obsidian as supplementary cementitious materials (SCMs). The results suggest that the mechanochemical treatment of clay and marl resulted in delamination, dehydroxylation, and amorphisation of the mineral components (including calcite); while for obsidian, the main effect was particle size reduction. Among all samples prepared, the mechanochemically treated obsidian exhibited the best performance as a SCM and achieved marginally higher strength performance at 20% cement replacement compared with the CEM I cement mortar (with on SCM). The thermally activated clay and marl exhibited highest pozzolanic reactivity than the mechanochemically treated counterparts owning to the formation of free lime from calcination of calcite. However, the mechanochemically treated clay and marl were still able to achieve over 80% of the strength activity index and performed much better than the untreated materials. These results indicate that mechanochemical treatment can effectively improve the pozzolanic reactivity of clay minerals that contain calcite up to 68% without directly emitting process CO 2 to the environment (calcination of carbonates), which can be an alternative activation route to the high-temperature calcination-treatment method.
ISSN:1359-5997
1871-6873
DOI:10.1617/s11527-023-02280-z