RT Journal Article
T1 Effect of Activating Solution Modulus on the Synthesis of Sustainable Geopolymer Binders Using Spent Oil Bleaching Earths as Precursor
A1 Delgado-Plana, P.
A1 Rodriguez-Exposito, A.
A1 Bueno-Rodriguez, S.
A1 Perez-Villarejo, L.
A1 Tobaldi, D. M.
A1 Labrincha, J. A.
A1 Eliche-Quesada, D.
K1 spent bleaching earth
K1 geopolymers
K1 activating solution
K1 activator modulus
K1 compressive strength
K1 microstructure
K1 Ash-based-geopolymers
K1 Fly-ash
K1 Waste glass
K1 Inorganic geopolymers
K1 Mechanical-properties
K1 Part i
K1 Cement
K1 Sodium
K1 Fabrication
K1 Resistance
AB The valorization of spent oil bleaching earths (SOBE) is crucial for the protection of the environment and the reuse of resources. In this research, alkali-activated binders were manufactured at room temperature using SOBE as a precursor by varying the mass ratio between the activating solutions of sodium silicate (Na2SiO3) and 6 M sodium hydroxide (NaOH) (activating solution modulus) (Na2SiO3/NaOH ratio = 1/1; 1/2; 1/3; 1/4) to investigate the influence on the technological properties of the materials. This process intends to evaluate the potential of SOBE, heat-treated at 550 degrees C (1 h), as a precursor of the reaction (source of aluminosilicates). Samples produced with higher amounts of sodium silicate developed a denser structure, with lower porosity and a higher amount of geopolymer gel. Maximum flexural (8.35 MPa) and compressive (28.4 MPa) strengths of samples cured at room temperature for 28 days were obtained with a Na2SiO3/NaOH mass ratio of 1/1. The study demonstrates that SOBE waste can be used as a precursor in the manufacture of geopolymer binders that show a good compromise between physical, mechanical and thermally insulating characteristics.
PB Mdpi
YR 2021
FD 2021-07-01
LK http://hdl.handle.net/10668/19330
UL http://hdl.handle.net/10668/19330
LA en
DS RISalud
RD Apr 8, 2025