RT Journal Article
T1 Valorization of phosphogypsum wastes as asphaltic bitumen modifier
A1 Cuadri Vega, Antonio Abad
A1 Navarro Domínguez, Francisco Javier
A1 García Morales, Moisés
A1 Bolívar Raya, Juan Pedro
AB The accumulation of phosphogypsum wastes from the fertilizer industries, which remain in regulated stacks occupying considerable land resources, is causing significant environment problems worldwide. In that sense, the scientific community is being pressured to find alternative ways for their disposal. In this research, we propose a novel application for phosphogypsum wastes, as a modifier of bitumen for flexible road pavements. Viscous flow tests carried out on bitumen modified with a phosphogypsum waste and doped with sulfuric acid demonstrated an extraordinary increase in viscosity, at 60 ºC, when compared to a counterpart sample which had been modified with gypsum, the main component of phosphogypsum. Similarly, a significant improvement in the viscoelastic response of the resulting material at high temperatures was also found. FTIR (Fourier transform infrared spectroscopy) scans provided evidences of the existence of chemical reactions involving phosphorus, as revealed by a new absorption band from 1060 to 1180 cm-1, related to C−O−P vibrations. This result points at phosphorus contained in the phosphogypsum impurities to be the actual “modifying” substance. Furthermore, no C-O-P band was observed in the absence of sulfuric acid, which seems to be the “promoting” agent of this type of bond.
PB Elsevier
SN 0304-3894
SN 1873-3336 (electrónico)
YR 2014
FD 2014
LK http://hdl.handle.net/10272/12104
UL http://hdl.handle.net/10272/12104
LA eng
NO Cuadri Vega, A.A., Navarro Domínguez, F.J., García Morales, M., Bolivar Raya, J.P.: "Valorization of phosphogypsum wastes as asphaltic bitumen modifier. Journal of Hazardous Materials. Vol. 279, págs. 11-16, (2014). DOI: 10.1016/j.jhazmat.2014.06.058
NO This work has been also supported by the Government of Andalusia through two projects: TEP 6689 programme and the “Characterization and modeling of the phosphogypsum stacks from Huelva for their environmental management and control” (Ref.: RNM-6300). The authors gratefully acknowledge their financial support. A.A. Cuadri also thanks “Ministerio de Educación” for the concession of a F.P.U. research grant (AP2008-01419).
DS Repositorio Institucional de la Universidad de Huelva
RD 31 may 2026