Synthesis of clay geopolymers using olive pomace fly ash as an alternative activator. Influence of the additional commercial alkaline activator used
| Autor: | Luis Pérez-Villarejo, M.A. Gómez-Casero, Dolores Eliche-Quesada, Pedro José Sánchez-Soto, F.J. Moral-Moral |
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| Přispěvatelé: | [Gomez-Casero, M. A.] Univ Jaen, Dept Chem Environm & Mat Engn, Higher Polytech Sch Jaen, Campus Las Lagunillas S-N, Jaen 23071, Spain, [Moral-Moral, F. J.] Univ Jaen, Dept Chem Environm & Mat Engn, Higher Polytech Sch Jaen, Campus Las Lagunillas S-N, Jaen 23071, Spain, [Eliche-Quesada, D.] Univ Jaen, Dept Chem Environm & Mat Engn, Higher Polytech Sch Jaen, Campus Las Lagunillas S-N, Jaen 23071, Spain, [Perez-Villarejo, L.] Univ Jaen, Dept Chem Environm & Mat Engn, Higher Polytech Sch Linares, Campus Cient Tecnol,Cinturon Sur S-N, Linares 23700, Jaen, Spain, [Perez-Villarejo, L.] Univ Jaen, Ctr Adv Studies Earth Sci Energy & Environm CEACT, Campus Las Lagunillas S-N, Jaen 23071, Spain, [Eliche-Quesada, D.] Univ Jaen, Ctr Adv Studies Earth Sci Energy & Environm CEACT, Campus Las Lagunillas S-N, Jaen 23071, Spain, [Sanchez-Soto, P. J.] Univ Seville, Inst Mat Sci Sevilla ICMS, Joint Ctr Spanish Natl Res Council CSIC, Seville 41092, Spain, project Development and characterization of new geopolymeric composites based on waste from the olive industry, MINECO |
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Bottom ash
Materials science Potassium Cement chemistry.chemical_element Valorization 02 engineering and technology 01 natural sciences law.invention Biomaterials chemistry.chemical_compound law Olive pomace fly ash 0103 physical sciences Alkaline activator Binders Calcination Fourier transform infrared spectroscopy Microstructure Alkaline activators 010302 applied physics Potassium hydroxide Mining engineering. Metallurgy Geopolymers Sodium Metals and Alloys Pomace TN1-997 021001 nanoscience & nanotechnology Surfaces Coatings and Films Compressive strength chemistry Chemical engineering Sustainability Fly ash Ceramics and Composites Hydroxide Clay Clays Strength 0210 nano-technology Metakaolin |
| Zdroj: | Digital.CSIC: Repositorio Institucional del CSIC Consejo Superior de Investigaciones Científicas (CSIC) Digital.CSIC. Repositorio Institucional del CSIC instname Journal of Materials Research and Technology, Vol 12, Iss, Pp 1762-1776 (2021) |
| Popis: | In this research, the use of olive pomacefly ash(OPFA) as an alkaline source for the activationof calcined clays (CC) from Bail en (Ja en, Spain) was studied. The optimal composition was obtained for 70 wt % CC and 30 wt % OPFA. The physical,mechanical and thermal properties of control geopolymers that usewater as a liquidmediumhave been studied and comparedwith geopolymers that use additional activating solutions as sodiumor potassiumhydroxide solutions (8M), or amixture of alkaline hydroxide and alkaline silicate solution (NaOHeNa2SiO3 or KOHeK2SiO3). The results showed that OPFA can be used as an alkaline activator, showing mechanical properties slightly lower than those obtained when additional alkaline hydroxide activating solutions were used. The best compressive strength was obtained for geopolymers that use alkaline silicates as an activating solution. However, the best thermal insulation properties were obtained for control geopolymers. The microstructural characteristics of the geopolymers were evaluated by means of X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy and Scanning ElectronMicroscopy (SEM-EDS) that corroborate the formationof geopolymeric gel inall the specimens, beingthe amount of gel formed greater insamples using commercial potassiumactivating solutions. These results demonstrate the feasibility of using this type of waste, OPFA, as activating reagents in the manufacture of geopolymers or alkaline activated materials. The manufactured geopolymers can be used as compressed earth blocks for walls and partitions, since the specimens pursue mechanical properties that comply with current regulations, presenting better thermal insulation properties. |
| Databáze: | OpenAIRE |
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