caa a22 4500 463224108 CHVBK 20180405153221.0 cr unu---uuuuu 170326e20070501xx s 000 0 eng 10.1007/s10853-006-0535-4 doi (NATIONALLICENCE)springer-10.1007/s10853-006-0535-4 Physical evolution of Na-geopolymer derived from metakaolin up to 1000°C [Elektronische Daten] [Peter Duxson, Grant Lukey, Jannie van Deventer] The thermal shrinkage and weight loss of a systematic series of geopolymers with nominal composition of NaAlO2(SiO2) z ·5.5H2O (1.15≤z≤2.15) made by activation of metakaolin with sodium silicate solutions are presented. The thermal behaviour of Na-geopolymers are varied, but may be categorised into four regions of behaviour exhibited by all specimens. This investigation explores the effect of nominal Si/Al on the processes and mechanisms of thermal shrinkage and weight loss throughout constant heating of Na-geopolymer. The overall thermal shrinkage of Na-geopolymer increases with increasing nominal Si/Al, with the onset temperature of structural densification occurring at lower temperature with increasing Si/Al. Thermal shrinkage is observed to result from capillary strain, dehydroxylation and viscous sintering in different temperature regions, and is explored by use of dilatometry, thermogravimetry, nitrogen porosimetry and use of different constant heating rates. Springer Science+Business Media, LLC, 2007 Duxson Peter Department of Chemical and Biomolecular Engineering, The University of Melbourne, 3010, Melbourne, Victoria, Australia aut Lukey Grant Department of Chemical and Biomolecular Engineering, The University of Melbourne, 3010, Melbourne, Victoria, Australia aut van Deventer Jannie Department of Chemical and Biomolecular Engineering, The University of Melbourne, 3010, Melbourne, Victoria, Australia aut Journal of Materials Science Kluwer Academic Publishers-Plenum Publishers; http://www.springer-ny.com 42/9(2007-05-01), 3044-3054 0022-2461 42:9<3044 2007 42 10853 https://doi.org/10.1007/s10853-006-0535-4 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10853-006-0535-4 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Duxson Peter Department of Chemical and Biomolecular Engineering, The University of Melbourne, 3010, Melbourne, Victoria, Australia aut NATIONALLICENCE 700 1- Lukey Grant Department of Chemical and Biomolecular Engineering, The University of Melbourne, 3010, Melbourne, Victoria, Australia aut NATIONALLICENCE 700 1- van Deventer Jannie Department of Chemical and Biomolecular Engineering, The University of Melbourne, 3010, Melbourne, Victoria, Australia aut NATIONALLICENCE 773 0- Journal of Materials Science Kluwer Academic Publishers-Plenum Publishers; http://www.springer-ny.com 42/9(2007-05-01), 3044-3054 0022-2461 42:9<3044 2007 42 10853 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer