Characteristics of silicon carbide sludge-based geopolymers

In this study, metakaolin (MK) with silicon carbide sludge (SiC sludge) was used in the preparation of geopolymers, and its use as a structural material was demonstrated. The production of SiC sludge metakaolin-based (SCM) geopolymers was investigated by using solid/liquid (S/L) ratios of 0.4–1.0 an...

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Bibliographic Details
Published in:Polymer bulletin (Berlin, Germany) Germany), 2022-02, Vol.79 (2), p.843-865
Main Authors: Lin, Kae-Long, Lo, Kang-Wei, Cheng, Ta-Wui
Format: Article
Language:English
Subjects:
Aluminum
Cement
Characterization and Evaluation of Materials
Chemistry
Chemistry and Materials Science
Complex Fluids and Microfluidics
Curing
Geopolymers
Industrial wastes
Mechanical properties
Metakaolin
NMR
Nuclear magnetic resonance
Organic Chemistry
Original Paper
Physical Chemistry
Polymer Sciences
Polymerization
Scanning electron microscopy
Silica
Silicon carbide
Sludge
Sodium
Soft and Granular Matter
Synergistic effect
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Summary:In this study, metakaolin (MK) with silicon carbide sludge (SiC sludge) was used in the preparation of geopolymers, and its use as a structural material was demonstrated. The production of SiC sludge metakaolin-based (SCM) geopolymers was investigated by using solid/liquid (S/L) ratios of 0.4–1.0 and SiC sludge replacement levels of 0–40% to understand the effects of the geopolymerization process. The results indicated that for SCM geopolymers with SiC sludge replacement levels of 10–40% and a solid–liquid ratio of 1.0, the strength decreased from 70.02 MPa to 48.47 MPa after 56 days of curing. The heat evolution of the first exothermal peak clearly decreased from 990.6 W/g to 835.7 W/g as the SiC sludge content increased from 10 to 40%. After 56 days of curing, the mesopore content decreased from 98.94% to 95.24% in SCM geopolymers with 10% to 40% SiC sludge. After 56 days of curing, SiC sludge replacement levels of 0%, 10% and 40% increased, and the polymerization degree increased to 82.3%, 82.7% and 80.5%, respectively. At a solid–liquid ratio of 1.0, SCM geopolymers with a 10% SiC sludge content exhibited excellent mechanical properties, which accounted for the synergistic effect of the SiC sludge and MK. This study revealed that SCM geopolymers with a SiC sludge replacement level of 10% are beneficial to the geopolymerization process and that they can be used as a structural material. Graphic abstract
ISSN:0170-0839
1436-2449
DOI:10.1007/s00289-021-03536-w