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 article, the effect of wetting-drying (w-d) cycles on the strength and microstructural changes of RAP-FA blend and RAPFA geopolymer was investigated by unconfined compression strength test.
124 citations
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TL;DR: In this article, a set of mechanical properties of synthesized geopolymers, synthesized by alkali (NaOH or KOH) activation of metakaolin and SiO2 mixture, were characterized at ambient temperature.
Abstract: In this study, a set of mechanical properties of geopolymers, synthesized by alkali (NaOH or KOH) activation of metakaolin and SiO2 mixture, were characterized at ambient temperature. Samples with K/Al or Na/Al atomic ratios equal to 1, Si/Al atomic ratios in the 1.25–2.5 range and H2O/Al2O3 molar ratios of 11 or 13 are cured at 80 °C for 24 and 48 h before characterization, to determine effect of Si/Al ratio and curing time on the structure and mechanical properties of geopolymers. The structure of synthesized geopolymers characterized using XRD, NMR, SEM, and density measurements was correlated to their mechanical properties, including compressive strength, Young’s modulus, hardness, and fracture toughness. The results of this study suggest a strong effect of Si/Al ratios (in the 1.5–2 range), density, and microstructure on the maximum strength, Young’s modulus, and hardness of geopolymers. There were also notable differences in strength between samples cured for 24 and 48 h, suggesting that the degree of geopolymerization reaction also plays important role in mechanical properties of this new class of inorganic polymers.
123 citations
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TL;DR: Results show that high strength geopolymer mortars of 35.0-44.0MPa can be produced using mixture of ground FBC ash and as-received PCC-fly ash, which is more reactive and results in higher degree of reaction and higher strength geopolemer as compared to the use of coarser FBCAsh.
123 citations
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TL;DR: In this article, bottom ash (SiO2/Al2O3) was used as source of aluminosilicate and sodium hydroxide (NaOH = 5, 10 and 15 m) and sodium silicate (Na2SiO3, SiO2 /Na2O= 1.58) were used as alkaline medium.
122 citations
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TL;DR: Bayer red mud was pretreated through alkali-thermal activation process, and prepared as an one-part geopolymer precursor, which could be used as geopolymeric solidification/stabilization (S/S) reagent for municipal solid waste incineration fly ash (MSWI FA).
122 citations