By Greg Geiger
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Additional info for Developments in Strategic Materials and Computational Design IV
J. C. Lukey, The effect of composition and temperature on the properties of Fly ash and Kaolinite- based geopolymers Chemical Engineering Journal 89, 63-73 (2002). 4 J. Davidovits, Alkaline Cements and Concretes, KIEV Ukraine, 131-149 (1994). 5 M. Steveson, K. Sagoe-Crentsil, Relationships between composition, structure and strength of inorganic polymers Part 1 metakolin-derived inorganic polymers. J Mater Sci 40:20232036 (2005) 6 P. De Silva, K. Sagoe-Crenstil, V. Sirivivatnanon Kinetics of geopolymerization: Role of A1203 and Si0 2 .
87) at the final setting time (22°C) and after 24 hrs curing at 60°C are shown in Fig. 2 (a-d) and Fig. 3 (a-d) respectively19. The XRD pattern of raw fly ash (Fig 2a) comprises mainly of amorphous phase with traces of crystalline anhydrite (CaS04), quartz (SiC>2), magnesioferrite (MgFe204), calcium oxide (CaO) and hematite (Fe203). In control sample (Fig. 2b), the main changes occurring during alkali activation are the disappearance of CaSC>4 and CaO (originally present in fly ash) suggesting initial involvement of Ca+2 ions in the setting process.
This suggests greater consumption of of Ca+2 ions in the setting process when extra silica is present in the system. As with the control sample, the XRD pattern of alumina-added sample also showed the formation of new phases Na2SC>4 and Ca(OH)2. There is no unreacted A1203 present in the alumina-added sample (Fig 2d) indicating involvement of the added alumina in the reactions during the setting period. It has been reported20 that in calcium containing geopolymer systems, the possible phases expected to form at the setting time are calcium silicate hydrate (CSH), calcium aluminate silicate hydrate (CASH) and sodium aluminate silicate hydrate (NASH, geopolymer gel phase).