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

Abstract:

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.

• Periodical: Key Engineering Materials (Volume 777)
• Pages: 513-517
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.777.513
• Online since: August 2018
• Authors: Van Quang Le, Minch Quang Do, Minh Duc Hoang, Thanh Phong Dang, Thu Ha Bui, Hoc Thang Nguyen*
• Keywords: Activated Aluminum, Activated Silica, Geopolymer, Red Mud, Silica Fume

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