Buy article PDF
The purchased file will be sent to you
via email after the payment is completed.
US$ 35
|
Advances in Concrete Construction Volume 14, Number 1, July 2022 , pages 1-13 DOI: https://doi.org/10.12989/acc.2022.14.1.001 |
|
|
|
Valorization of bottom ash with geopolymer synthesis: optimization of pastes and mortar |
||
Muriel S. Froener, Márlon A. Longhi, Fabiana de Souza, Erich D. Rodríguez and Ana Paula Kirchheim
|
||
| 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. | ||
| Key Words | ||
| bottom ash; geopolymers; valorization of wastes | ||
| Address | ||
| (1) Muriel S. Froener, Márlon A. Longhi, Fabiana de Souza, Ana Paula Kirchheim: Building Innovation Research Unit, Universidade Federal do Rio Grande do Sul (NORIE/UFRGS), Av. Osvaldo Aranha, 99. 3o andar, Porto Alegre, Brazil; (2) Muriel S. Froener: Caxias do Sul University (UCS), Rua Francisco Getúlio Vargas 1130, Caxias do Sul, CEP 95070-560, Brazil; (3) Erich D. Rodríguez: Department of Structures and Civil Construction, Technology Centre, Universidade Federal de Santa Maria (UFSM), Santa Maria, Av. Roraima 1000, Prédio 10A, RS, Brazil. | ||
| References | ||
| ||