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One-Part Geopolymer Mixes from Geothermal Silica and Sodium Aluminate

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Ailar Hajimohammadi, John L. Provis* and Jannie S. J. van Deventer

Department of Chemical and Biomolecular Engineering, University of Melbourne, Victoria 3010, Australia

Ind. Eng. Chem. Res., 2008, 47 (23), pp 9396–9405

DOI: 10.1021/ie8006825

Publication Date (Web): October 28, 2008

* To whom correspondence should be addressed. E-mail: jprovis@unimelb.edu.au. Phone: +61 3 8344 8755. Fax: +61 3 8344 4153.

Section:

Cement, Concrete, and Related Building Materials

Abstract

In geopolymer technology, silicate solutions are frequently used as alkali activators to dissolve the solid aluminosilicate precursor and aid in binder formation. These corrosive and often viscous solutions are not user-friendly and would be difficult to use for bulk production. Developing geopolymers as a one-part mixture (“just add water”), similar to Portland cement, increases their commercial viability. Here, for the first time, the geopolymer system consisting of geothermal silica and solid sodium aluminate (providing the solid silica, alkali, and alumina sources) is studied. The effects of water content, high early silica, and high early alumina in the formation of one-part mix geopolymers are also investigated. This system demonstrates that making geopolymers from solid sources by “just adding water” is possible. XRD shows that the formulation with less water has an unexpected greater extent of crystallinity. It is also observed that a high early Al concentration inhibits geopolymerization, while a high early Si concentration enhances the reaction.

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This article has been cited by 1 ACS Journal articles (1 most recent appear below).

Effect of Alumina Release Rate on the Mechanism of Geopolymer Gel Formation
Ailar Hajimohammadi, John L. Provis, and Jannie S. J. van Deventer
Chemistry of Materials2010 22 (18), 5199-5208
- Effect of Alumina Release Rate on the Mechanism of Geopolymer Gel Formation
  Ailar Hajimohammadi, John L. Provis, and Jannie S. J. van Deventer
  Chemistry of Materials2010 22 (18), 5199-5208
  The effect of the rate of alumina release during the reaction of a one-part (just-add-water) geopolymer mix on growing geopolymer gels is investigated by coupling time-resolved and spatially resolved infrared spectroscopic analysis. The rate of alumina ...
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