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, healing agent particles are coated with geopolymers following different mixture recipes, and they are incorporated in cement paste in order to determine the feasibility of application of the particles in concrete.
71 citations
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TL;DR: In this article, the mechanical and durability properties of geopolymer composites prepared using metakaolin and colemanite binding materials with basalt and polyvinyl alcohol fibers were investigated under the influence of curing systems.
71 citations
01 Jan 2009
TL;DR: In this paper, an experimental study was conducted to assess the acid resistance of fly ash-based Geopolymer mortar specimens having percentage Na2O ranging from 5% to 8% of the fly ash.
Abstract: Geopolymers are a new promising binder manufactured by activation of a solid aluminosilicate source material with a highly alkaline activating solution and aided by heat. Fly ash, considered to be a waste material is rich in silica and alumina and hence can be used as a source material for manufacture of Geopolymers. These binders have been reported to achieve high early strength and better durability as compared to Ordinary Portland cement based counterparts. An experimental study was conducted to assess the acid resistance of fly ash based Geopolymer mortar specimens having percentage Na2O ranging from 5% to 8% of fly ash. The program consisted immersion of specimens in solutions of 10% Sulfuric acid and 10% Nitric acid up to a period of 24 weeks and evaluation of its resistance in terms of surface corrosion, residual alkalinity, changes in weight and compressive strength at regular intervals. Geopolymer mortar samples did not show any noticeable change in colour and remained structurally intact though the exposed surface turned slightly softer. Through Optical microscope, corroded surface could be seen which increased with duration of exposure. Samples almost lost its alkalinity after exposure in the acid solution within 12 weeks and showed very low weight loss in the range from 0.81% to 1.64% in Sulfuric acid and from 0.21% to 1.42% in Nitric acid. Compressive strength loss at the end of test varied from 44% to 71% and 40% to 70% in Sulfuric acid and Nitric acid respectively. Results obtained in the present study indicate that Geopolymers are highly resistant to both Sulfuric and Nitric acid.
71 citations
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TL;DR: In this paper, the production and properties of lightweight composite panels, with expanded vermiculite as lightweight aggregate and geopolymer as binder, were investigated, and the produced composites were subjected to microstructural analyses, as well as to thermal and mechanical tests.
71 citations
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TL;DR: The investigation of the performance of porous geopolymers made with fly ash after exposure to temperatures from 600 °C up to 1000 °C showed that the pores exhibited strength increases after temperature exposure.
Abstract: This paper presents the results of a study on the effect of temperature on geopolymers manufactured using pozzolanic materials (fly ash). In this paper, we report on our investigation of the performance of porous geopolymers made with fly ash after exposure to temperatures from 600 °C up to 1000 °C. The research methodology consisted of pozzolanic materials (fly ash) synthesized with a mixture of sodium hydroxide and sodium silicate solution as an alkaline activator. Foaming agent solution was added to geopolymer paste. The geopolymer paste samples were cured at 60 °C for one day and the geopolymers samples were sintered from 600 °C to 1000 °C to evaluate strength loss due to thermal damage. We also studied their phase formation and microstructure. The heated geopolymers samples were tested by compressive strength after three days. The results showed that the porous geopolymers exhibited strength increases after temperature exposure.
71 citations