Effect of Activating Solution Modulus on the Synthesis of Sustainable Geopolymer Binders Using Spent Oil Bleaching Earths as Precursor
authors Delgado-Plana, P; Rodriguez-Exposito, A; Bueno-Rodriguez, S; Perez-Villarejo, L; Tobaldi, DM; Labrincha, JA; Eliche-Quesada, D
nationality International
journal SUSTAINABILITY
author keywords spent bleaching earth; geopolymers; activating solution; activator modulus; compressive strength; microstructure
keywords ASH-BASED-GEOPOLYMERS; FLY-ASH; WASTE GLASS; INORGANIC GEOPOLYMERS; MECHANICAL-PROPERTIES; PART I; CEMENT; SODIUM; FABRICATION; RESISTANCE
abstract 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.
publisher MDPI
isbn 2071-1050
year published 2021
volume 13
issue 13
digital object identifier (doi) 10.3390/su13137501
web of science category 18
subject category Green & Sustainable Science & Technology; Environmental Sciences; Environmental Studies
unique article identifier WOS:000671318600001
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journal analysis (jcr 2019):
journal impact factor 2.576
5 year journal impact factor 2.798
category normalized journal impact factor percentile 45.319
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