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Valorization of bottom ash with geopolymer synthesis: Optimization of pastes and mortar

  • Froener, Muriel S. (Building Innovation Research Unit, Universidade Federal do Rio Grande do Sul (NORIE/UFRGS)) ;
  • Longhi, Marlon A. (Building Innovation Research Unit, Universidade Federal do Rio Grande do Sul (NORIE/UFRGS)) ;
  • de Souza, Fabiana (Building Innovation Research Unit, Universidade Federal do Rio Grande do Sul (NORIE/UFRGS)) ;
  • Rodriguez, Erich D. (Department of Structures and Civil Construction, Technology Centre, Universidade Federal de Santa Maria (UFSM)) ;
  • Kirchheim, Ana Paula (Building Innovation Research Unit, Universidade Federal do Rio Grande do Sul (NORIE/UFRGS))
  • Received : 2021.12.23
  • Accepted : 2022.06.07
  • Published : 2022.07.25
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Abstract

Due to the physical-chemical characteristics of some bottom ash (BA), there are technical, economic and environmental limitations to find a destination that will add value to it. In Brazil, this residue is eventually used for filling coal extraction pits or remains in sedimentation ponds, creating a susceptible panorama to environmental issues. The geopolymers binders are one of the alternatives to the proper use high amounts of these materials. In this work, geopolymeric binder pastes were produced with BA mixed to activators with different alkali contents (expressed as %Na2O), as well as the incorporation of soluble silicates (Ms content). The production of binary geopolymeric pastes based on the use of two industrial wastes: fluid catalytic cracking (FCC) and aluminum anodizing sludge (AAS), was also assessed. The content in mass of BA/FCC and BA/AAS ranged from 100/0, 90/10; 80/20 and 70/30. Systems with soluble silicates as activator in a molar ratio SiO2/Na2O of 1.0 (Ms = 1.0) and Na2O content of 15%, showed the best results of mechanical strength (42 MPa at day 28th). The improvement is up to 5X when compared to NaOH based systems. For systems with partial replacement of BA of 10% of AAS and 20% of FCC (80/20), the presence of soluble silicates was also effective to increase compressive strength.

Keywords

Acknowledgement

The participation of Brazilian authors was sponsored by CNPq (Brazilian National Council for Scientific and Technological Development) through the research project UNIVERSAL grant number 458597/2014-7 and the research fellowships PQ2017 303753/2017-0 and 305530/2017- 8.

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