Topic
Geopolymer
About: Geopolymer is a research topic. Over the lifetime, 6776 publications have been published within this topic receiving 157991 citations. The topic is also known as: geopolymers.
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TL;DR: In this paper, the compressive strength of the examined mixes was found to be in the range of 40-50 MPa for 40% and 50% ground granulated blast furnace slag replacement mixtures respectively.
205 citations
TL;DR: In this paper, a critical overview on fly ash utilisation with emphasis on mechanical activation of fly ash in developing processes for medium to high volume utilisation of fly Ash is presented.
Abstract: This paper is a critical overview on fly ash utilisation with emphasis on mechanical activation of fly ash in developing processes for medium to high volume utilisation of fly ash. Applications of mechanical activation that are particularly highlighted include blended cement containing high volume (50–60%) of fly ash, and geopolymer materials, such as high compressive strength (up to 120 MPa) geopolymer cements and self glazed tiles. The schemes for the utilisation of fly ash involving mechanical activation are worked out that have potential to evolve as sustainable solutions.
204 citations
TL;DR: Porous fly ash-based geopolymer material was produced using fly ash and sodium water glass as original material and H 2 O 2 as foaming agent in this paper, where the changes caused by the geopolymersization and decomposition of H 2O 2 on the properties of the final products were investigated by applying curing on geopolym mortars with different amounts of sodium waterglass (60, 80 and 100 ǫ) and H2 O 2 (4, 6 and 8 g) added at various curing temperatures.
204 citations
TL;DR: Comparison of fly ash-based geopolymer systems with classical Portland cement stabilization methods has also been accomplished, showing that the leachate pH was the most important variable for the immobilization of metals.
204 citations
15 Apr 2011-Materials Science and Engineering A-structural Materials Properties Microstructure and Processing
TL;DR: In this article, the authors report on the characterisation of fly ash from three Australian power stations in terms of elemental composition, phase composition, particle size, density and morphology, and the effect of the source fly ash characteristics on the hardened product is discussed, as well as implications for high temperature applications.
Abstract: Fly ash characteristics cannot be assumed to be constant between power stations as they are highly dependent on the coal source and burning conditions. It is critical to understand the characteristics of fly ash in order to produce geopolymers suitable for high temperature applications. We report on the characterisation of fly ash from three Australian power stations in terms of elemental composition, phase composition, particle size, density and morphology. Geopolymers were synthesised from each of the fly ashes using sodium silicate and sodium aluminate solutions to achieve a range of Si:Al compositional ratios. Mechanical properties of geopolymer binders are presented and the effect of the source fly ash characteristics on the hardened product is discussed, as well as implications for high temperature applications. It was found that the twenty eight day strength of geopolymers is largely dependent on the sub 20 μm size fraction of the fly ash. Strength loss after high temperature exposure was found to be dependent on the concentration of iron in the fly ash precursor and the Si:Al ratio of the geopolymer mixture.
204 citations