Evaluation on Roles of Activated Silicon and Aluminum Oxides for Formation of Geopolymer from Red Mud and Silica Fume

In this study, the alkaline solutions (NaOH) with concentration from 1M to 10M, red mud (RM) and silica fume (SF) were used as reactors in geopolymer reactions. RM contains 7.40% SiO2 and 13.65% Al2O3, SF has 94.50% SiO2, but only the activated oxides can participate into the geopolymer reactions. T...

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Bibliographic Details
Published in:Key engineering materials 2018-08, Vol.777, p.513-517
Main Authors: Do, Minch Quang, Dang, Thanh Phong, Nguyen, Hoc Thang, Le, Van Quang, Hoang, Minh Duc, Bui, Thu Ha
Format: Article
Language:English
Subjects:
Aluminum
Aluminum oxide
Geopolymers
Polymers
Red mud
Silica fume
Silicon dioxide
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Summary:In this study, the alkaline solutions (NaOH) with concentration from 1M to 10M, red mud (RM) and silica fume (SF) were used as reactors in geopolymer reactions. RM contains 7.40% SiO2 and 13.65% Al2O3, SF has 94.50% SiO2, but only the activated oxides can participate into the geopolymer reactions. The activity of the oxides was investigated by measuring the dissolution of RM and SF in different concentrations of NaOH. Characteristics of the geopolymer samples were tested for compressive strength and softening-coefficient, its microstructure was analyzed by using X – ray diffraction (XRD). The experimental results were indicated that activated SiO2 is the highest exist in SF. In the structure of geopolymers, the silica can be bonded directly to each other (Si-Si) or linked through “most” oxygen (Si-O-Si) to form independent polymer chains, while aluminum themselves cannot create independent polymer chains, it only can be replaced the Si atomic in Si-O-Si polymer chains (Si-O-Al), instead.
ISSN:1013-9826
1662-9795
1662-9795
DOI:10.4028/www.scientific.net/KEM.777.513