Strategies to control the high temperature shrinkage of fly ash based geopolymers
MetadataShow full item record
Strategies to control thermally induced shrinkage in fly ash based geopolymers are investigated. The useof low (<2) Si:Al ratios in the geopolymer provides superior thermal properties and the addition of fillers delivered additional improvements resulting in impressive thermal resistance. Two thermally stable inorganic fillers, α-alumina and wollastonite, were used because of their high melting points and relatively low thermal expansion. Shrinkage events at elevated temperatures revealed that samples containing filler exhibited 30–35% less volume shrinkage than the control at 1000 °C. Initial compressive strength was moderate (~30 MPa), but increased markedly when samples were fired in excess of 600 °C >100 MPa). Wollastonite addition also improved the flexural strength of the samples which was attributed to its acicular shape imparting fibre-like qualities. Microstructural investigations showed that unfired samples predominantly consisted of spherical particles coated with reaction product. Firing to 1000 °C converted the morphology to a more compact phase with increased pore size.
Showing items related by title, author, creator and subject.
Microstructural design and properties of high performance recycled cellulose fibre reinforced polymer eco-nanocompositesAlamri, Hatem Rashed (2012)In recent years, cellulose fibre-reinforced polymer composites have been gaining a great attention in several engineering applications due to their desirable properties, which include low density, low cost, renewability ...
Subaer (2004)Inorganic geopolymers or simply geopolymers based on silico-aluminate are relatively novel materials with a wide range of potential applications. The mAln purpose of the present study was to experimentally investigate the ...
Effect of filler load on the curing behavior and mechanical and thermal performance of wood flour filled thermoset compositesNabinejad, O.; Debnath, Sujan; Rahman, Muhammad; Davies, Ian (2017)© 2017 Elsevier Ltd The mechanical and thermal performance of wood flour composites (WFCs) containing thermoset resin is known to be strongly dependent on the curing reaction. In the present work, WFCs were prepared based ...