The evolution of strength and crystalline phases for alkali-activated ground blast furnace slag and fly ash-based geopolymers

Jae Eun Oh, Paulo J. M. Monteiro, Ssang Sun Jun, Sejin Choi, Simon M. Clark

Research output: Contribution to journalArticlepeer-review

279 Scopus citations

Abstract

The increase in strength and evolution of crystalline phases in inorganic polymer cement, made by the alkali activation of slag, Class C and Class F fly ashes, was followed using compressive strength test and synchrotron X-ray diffraction. In order to increase the crystallinity of the product the reactions were carried out at 80 °C. We found that hydrotalcite formed in both the alkali-activated slag cements and the fly ash-based geopolymers. Hydroxycancrinite, one member of the ABC-6 family of zeolites, was found only in the fly ash geopolymers. Assuming that the predominantly amorphous geopolymer formed under ambient conditions relates to the crystalline phases found when the mixture is cured at high temperature, we propose that the structure of this zeolitic precursor formed in Na-based high alkaline environment can be regarded as a disordered form of the basic building unit of the ABC-6 group of zeolites which includes poly-types such as hydroxycancrinite, hydroxysodalite and chabazite-Na. © 2009 Elsevier Ltd.
Original languageEnglish (US)
Pages (from-to)189-196
Number of pages8
JournalCement and Concrete Research
Volume40
Issue number2
DOIs
StatePublished - Feb 2010
Externally publishedYes

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