Production and characterization of geopolymers based on mixed compositions of metakaolin and coal ashes |
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| Affiliation: | 1. National Research Council of Italy, Institute of Science and Technology for Ceramics (CNR-ISTEC), via Granarolo 64, Faenza 48018, Italy;2. Dipartimento di Chimica Industriale “Toso Montanari” – ALMA MATER STUDIORUM – Università di Bologna, Viale Risorgimento 4, Bologna 40136, Italy;1. Instituto de Investigación en Metalurgia y Materiales, Universidad Michoacana de San Nicolás de Hidalgo, Ed. “U”, Ciudad Universitaria, Morelia, Michoacán 58030, Mexico;2. School of Resources and Environmental Engineering, Wuhan University of Technology, Luoshi Road 122, Wuhan, Hubei 430070, China;1. University of Bejaia, Materials Technology Laboratory of Process Engineering (LTMGP), Targua Ouzemmour Road, Bejaia 06000, Algeria;2. Department of Chemical, Environmental and Materials Engineering, Higher Polytechnic School of Linares, University of Jaén, Avenida de la Universidad s/n, 23700 Linares, Spain |
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| Abstract: | Mixtures of coal ashes from pulverized coal combustion (PCC) or fluidized bed combustion (FBC) and metakaolin were used to synthetize geopolymers. Upon full characterization of the raw powders (chemical and mineralogical composition), geopolymerization tests were conducted using an alkali aqueous solution of NaOH/Na2SiO3 at different dilutions. The produced geopolymers were subjected to SEM analysis, as well as to leaching, thermal and mechanical tests. The final microstructure and the properties of the geopolymers indicate that FBC ash can be conveniently used as a partially reactive filler in combination with the metakaolin powder. The composite material has good thermal performance and compressive strength (∼30 MPa) suitable for the building sector. |
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