@article{10272/20352,
year = {2021},
url = {http://hdl.handle.net/10272/20352},
abstract = {: The immobilization of hazardous wastes in ordinary Portland cement (OPC)-based materials has been widely studied and implemented. OPC-based materials have a high carbon footprint
associated with their production and geopolymer materials are a sustainable and eco-friendly alternative. Therefore, this work aimed to immobilize two hazardous industrial wastes: copper wastewater
sludge and phosphogypsum in one-part geopolymer materials. For that purpose, the precursor was
partially substituted by these wastes (5, 10 and 20 wt.%) in the formulations. The geopolymer fresh
and hardened state properties were evaluated, and the immobilisation of pollutants was determined
through leaching tests. In phosphogypsum pastes (PG5, PG10 and PG20) it was observed that the
compressive strength decreased with the increase in its amount, varying between 67 MPa and 19 MPa.
In copper sludge pastes, the compressive strength of the specimens (CWS5 and CWS10) reached
~50 MPa. The mortars, MPG10 and MCWSs10, had compressive strengths of 13 MPa and 21 MPa,
respectively. Leaching tests showed that pastes and mortars immobilise the hazardous species of
the wastes, except for As from copper sludge, whose the best result was found in the compact paste
(CWSs10) that leached 2 mg/kg of As. Results suggest that optimized compositions are suitable for
the construction sector},
organization = {This research was funded by Ministerio de Ciencia e Innovación (MICINN), grant number
PID2020-116461RB-C21 and Agencia de Innovación y Desarrollo de Andalucía (IDEA) grant number
UHU-1255876. This work was done in the scope of the project CICECO- Aveiro Institute of Materials,
UIDB/50011/2020 & UIDP/50011/2020, co-financed by national funds through the FCT/MEC. This
research was funded by FCT (Portuguese Foundation for Science and Technology), grant number
2020.01135.CEECIND (R.M.N.) and SFRH/BD/144562/2019 (J.C.)},
publisher = {MDPI},
title = {Immobilization of Hazardous Wastes on One-Part Blast Furnace Slag-Based Geopolymers},
doi = {10.3390/su132313455},
author = {Paz Gómez, Daniela Carolina and Silveirinha Vilarinho, Inês and Pérez Moreno, Silvia María and Carvalheiras, João and Guerrero Márquez, José Luis and Miguel Novais, Rui and Seabra, Maria Paula and Ríos Ransanz, Guillermo and Bolívar Raya, Juan Pedro and Labrincha, João António},
}