Method to Stop Geopolymer Reaction. Issue 10 (4th July 2014)

• Record Type: Journal Article
• Authors: Chen, Xu; Meawad, Amr; Struble, Leslie J.; Jennings, H.
• Is Part Of: Journal of the American Ceramic Society. Volume 97:Issue 10(2014)
• Page Start: 3270
• Page End: 3275
• Publication Date: 2014-07-04
• Subjects: Ceramics -- Periodicals; 620.1405
• DOI: 10.1111/jace.13071
• Languages: English
• ISSNs: 0002-7820

Abstract

<abstract abstract-type="main" id="jace13071-abs-0001"> <title> <x xml:space="preserve">Abstract</x> </title> <p>The objective of this study was to develop a method to stop geopolymer reaction at early ages so that the molecular structure can be determined and its link to setting behavior probed. Solvent extraction, using a mixture of alcohol and acetone to remove water, was seen to suspend reaction up to at least 53 h, allowing enough time for nuclear magnetic resonance (NMR) tests to determine structure. However, this method caused precipitation of soluble species present at early ages, confounding interpretation of the spectra and thus making it suitable only for mature geopolymers. A combination of water treatment to extract soluble species and solvent treatment to extract water was seen to stop the geopolymer reaction long enough (&gt; 1 week) for NMR tests in specimens with and without calcium.</p> </abstract>