Alkali-activated limestone/metakaolin cements exposed to high temperatures: Structural changes

2021 ◽  
pp. 104147
Author(s):  
Pedro Perez Cortes ◽  
K. Cabrera Luna ◽  
J.Ivan Escalante Garcia
Keyword(s):  
High Temperatures ◽  
Structural Changes ◽  
Alkali Activated

scholarly journals Alkali-activated refractory wastes exposed to high temperatures: development and characterization

2020 ◽  
Vol 40 (8) ◽  
pp. 3314-3326 ◽  
Author(s):  
Bartolomeo Coppola ◽  
Caroline Tardivat ◽  
Stéphane Richaud ◽  
Jean-Marc Tulliani ◽  
Laura Montanaro ◽  
...  
Keyword(s):  
High Temperatures ◽  
Alkali Activated

The Influence of Mechanical Activation of Fly Ash on the Toxic Metals Immobilization by Fly Ash-Based Geopolymers

2018 ◽  
Vol 761 ◽  
pp. 3-6 ◽  
Author(s):  
Violeta Nikolić ◽  
Miroslav Komljenović ◽  
Nataša Džunuzović ◽  
Tijana Ivanovic
Keyword(s):  
Fly Ash ◽  
Mechanical Activation ◽  
Toxic Metals ◽  
Structural Changes ◽  
Gas Adsorption ◽  
Sodium Silicate Solution ◽  
Silicate Solution ◽  
Water Soluble ◽  
Alkali Activation ◽  
Alkali Activated

This paper investigates the influence of mechanical activation of fly ash on the toxic metals immobilization by fly ash-based geopolymers. Fly ash was firstly mechanically and then alkali-activated. Mechanical activation of fly ash was conducted in a planetary ball mill. Alkali activation of fly ash was carried out at room temperature by use of sodium silicate solution as an activator. Toxic metals (Pb and Cr) were added in the form of water soluble salts during the synthesis of geopolymers. The immobilization process was assessed via investigation of the mechanical and leaching properties of geopolymers. Structural changes of geopolymers during the toxic metals immobilization were assessed by means of gas adsorption and SEM analyses. Mechanical activation of fly ash led to a significant increase in geopolymer strength and to a reduced leaching of toxic metals from geopolymers.

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