caa a22 4500 463224191 CHVBK 20180405153221.0 cr unu---uuuuu 170326e20070501xx s 000 0 eng 10.1007/s10853-006-0548-z doi (NATIONALLICENCE)springer-10.1007/s10853-006-0548-z Direct measurement of the kinetics of geopolymerisation by in-situ energy dispersive X-ray diffractometry [Elektronische Daten] [John Provis, Jannie van Deventer] In-situ energy dispersive X-ray diffractometry (EDXRD) using synchrotron radiation has been used to directly observe the kinetics of formation of a geopolymeric gel from a metakaolin precursor. The use of a purpose-built hydrothermal cell with polychromatic radiation from a wiggler source enables collection of a full diffraction pattern approximately every 150s. This provides sufficient time resolution to observe the collapse of the metakaolin structure as it dissolves in the activating solution, accompanied by the reprecipitation of the geopolymeric gel binder phase from the now-supersaturated solution. Measurements taken on a limited set of samples of different composition (Si/Al ratio) show a clear trend in the rate of reaction with composition, and also a distinctly different mechanism of reaction in the most highly alkaline systems compared to those containing higher levels of dissolved silica in the activating solution. This corresponds to the results of previous microscopic observations showing significantly different microstructures in these systems, and confirms the value of this technique in analysis of the kinetics of geopolymerisation. Springer Science+Business Media, LLC, 2006 Provis John Department of Chemical and Biomolecular Engineering, The University of Melbourne, 3010, Melbourne, VIC, Australia aut van Deventer Jannie Department of Chemical and Biomolecular Engineering, The University of Melbourne, 3010, Melbourne, VIC, Australia aut Journal of Materials Science Kluwer Academic Publishers-Plenum Publishers; http://www.springer-ny.com 42/9(2007-05-01), 2974-2981 0022-2461 42:9<2974 2007 42 10853 https://doi.org/10.1007/s10853-006-0548-z text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10853-006-0548-z text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Provis John Department of Chemical and Biomolecular Engineering, The University of Melbourne, 3010, Melbourne, VIC, Australia aut NATIONALLICENCE 700 1- van Deventer Jannie Department of Chemical and Biomolecular Engineering, The University of Melbourne, 3010, Melbourne, VIC, Australia aut NATIONALLICENCE 773 0- Journal of Materials Science Kluwer Academic Publishers-Plenum Publishers; http://www.springer-ny.com 42/9(2007-05-01), 2974-2981 0022-2461 42:9<2974 2007 42 10853 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer