One-part geopolymers based on thermally treated red Mud/NaOH blends

Xinyuan Ke, Susan A. Bernal, Nan Ye, John L. Provis, Jiakuan Yang

Research output: Contribution to journalArticle

76 Citations (Scopus)

Abstract

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 800C 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.

Original languageEnglish
Pages (from-to)5-11
Number of pages7
JournalJournal of the American Ceramic Society
Volume98
Issue number1
DOIs
Publication statusPublished - 1 Jan 2015

ASJC Scopus subject areas

  • Ceramics and Composites
  • Geology
  • Geochemistry and Petrology
  • Materials Chemistry

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