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 starting materials were characterized by particle size distribution, specific surface area, chemical and mineralogical composition, and compressive strength of volcanic scoria and metakaolin.
74 citations
TL;DR: In this paper, the authors investigated the effect of fly ash characteristics on the strength development of a fly ash-based geopolymer, and reported an observation of delayed high-strength development of geopolymers.
74 citations
TL;DR: In this paper, the effect of adding sand as inert filler to metakaolin geopolymers was investigated and it was found that the viscosity increases with sand addition and mortars become unworkable when more than 40 vol% sand is added.
74 citations
TL;DR: In this article, the porosity of a porosity-based geopolymer is controlled with temperature, repeated temperature cycles and the mass introduced, and the thermal conductivity values of the foams were evaluated using a fluxmeter method.
Abstract: Porous potassium based geopolymers with a mutli-scale porosity were synthesized. Silica fume is introduced as an additive to the geopolymer formulation. The free silicon contained inside this silica fume is oxidized in alkaline solution, releasing molecular hydrogen which generates the porosity. Previous work has shown how the porosity can be controlled with temperature, repeated temperature cycles and the mass introduced. Using this protocol, homogeneous foams were made and then studied with scanning electron microscopy. In particular the foam expansion has been followed with time in relation to the microstructure. The thermal conductivity values of the foams were evaluated using a fluxmeter method. The effective thermal conductivities are comprised between 0.12 and 0.35 W m−1 K−1 for apparent densities ranging from 0.40 to 0.85 g cm−3. The corresponding calculated pore volume fractions are in the range of 65–85%. The interest of this material is that it combines the advantages of low bulk density and insulating properties with the characteristics of a geopolymer skeleton. Literature reports a very good fire and acid/base resistance, a low cost of production and the possibility of recycling industrial waste in the form of silica fume.
74 citations
TL;DR: In this paper, the saline water cured geopolymer samples were found to have lower sorptivity test results than normal water cured samples and improved properties of geopolymers when cured in saline water was found to be related to reduced leaching of reactants from the samples rather than the result of ingress of saline water into the samples.
74 citations