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One-Part Geopolymers Based on Thermally Treated Red Mud/NaOH Blends
In this study, one-part “just add water” geopolymer binders are synthesized through the alkali-thermal activation of the red mud which is relatively rich in both alumina and calcium. Calcination of the red mud with sodium hydroxide pellets at 800 °C leads to decomposition of the original silicate and aluminosilicate phases present in the red mud, which promotes the formation of new compounds with hydraulic character, including a partially ordered peralkaline aluminosilicate phase and the calcium-rich phases C3A and α-C2S. The hydration of the “one-part geopolymer” leads to the formation of zeolites and a disordered binder gel as the main reaction products, and the consequent development of compressive strengths of up to 10 MPa after 7 d of curing. These results demonstrate that red mud is an effective precursor to produce one-part geopolymer binders, via thermal and alkali-activation processes.
One-Part Geopolymers Based on Thermally Treated Red Mud/NaOH Blends
In this study, one-part “just add water” geopolymer binders are synthesized through the alkali-thermal activation of the red mud which is relatively rich in both alumina and calcium. Calcination of the red mud with sodium hydroxide pellets at 800 °C leads to decomposition of the original silicate and aluminosilicate phases present in the red mud, which promotes the formation of new compounds with hydraulic character, including a partially ordered peralkaline aluminosilicate phase and the calcium-rich phases C3A and α-C2S. The hydration of the “one-part geopolymer” leads to the formation of zeolites and a disordered binder gel as the main reaction products, and the consequent development of compressive strengths of up to 10 MPa after 7 d of curing. These results demonstrate that red mud is an effective precursor to produce one-part geopolymer binders, via thermal and alkali-activation processes.
One-Part Geopolymers Based on Thermally Treated Red Mud/NaOH Blends
Ke, Xinyuan (author) / Bernal, Susan A. (author) / Ye, Nan (author) / Provis, John L. (author) / Yang, Jiakuan (author) / Biernacki, J. (author)
Journal of the American Ceramic Society ; 98 ; 5-11
2015
7 Seiten
Article (Journal)
English
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