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Fly-Ash-Based Geopolymers: How the Addition of Recycled Glass or Red Mud Waste Influences the Structural and Mechanical Properties
N. Toniolo1, G. Taveri2, K. Hurle3, J.A. Roether4, P. Ercole5, I. Dlouhý2, A.R. Boccaccini1
1 Institute of Biomaterials, Department of Materials Science and Engineering, University of Erlangen-Nuremberg, Cauerstrasse 6, 91058 Erlangen, Germany
2 Institute of Physics of Materials, Czech Academy of Science, Žižkova 22, 616 62 Brno, Czech Republic
3 Institute of Mineralogy, University of Erlangen-Nuremberg, Schlossgarten 5a, 91054 Erlangen, Germany
4 Institute of Polymer Materials, University of Erlangen-Nuremberg, Martensstrasse 7, 91058 Erlangen, Germany
5 Sasil S.p.a, Regione Dosso, 13862 Brusnengo BI, Italy
received July 7, 2017, received in revised form August 11, 2017, accepted August 27, 2017
Vol. 8, No. 3, Pages 411-420 DOI: 10.4416/JCST2017-00053
Abstract
One of the main advantages of geopolymer technology is its capability to accommodate several types of waste that would otherwise be disposed of in landfills in the production of geopolymer materials. This study investigates the possibility of substituting proportions of fly ash, normally used for the synthesis of geopolymers, with recycled glass and red mud waste. Compressive and flexural strength testing, fracture toughness determination, SEM and FTIR analyses were performed. The results show that the compressive strength decreases as the amount of glass in the geopolymer increases; on the other hand, the addition of red mud seems to improve the mechanical behavior. Moreover, on substitution of fly ash with glass and red mud, the geopolymer demonstrates a similar performance in terms of fracture toughness and flexural strength properties. The results confirm that red mud and waste glass have the potential to partially replace fly ash in geopolymer synthesis, opening thus the possibility of using geopolymer technology to reuse such residues in technical materials.
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Keywords
Geopolymers, fly ash, red mud, waste glass
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