Phosphogypsum as additive 1 for foamed bitumen 2 manufacturing used in asphalt paving
The aim of this work was to use phosphogypsum (FY) waste in a sustainable paving practice involving the production of FY-foamed bitumen for road applications. For this proposal, three FY types coming from different fertilizer industries and a reference natural gypsum were used as foaming agents (10...
| Authors: | , , , , |
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| Format: | article |
| Publication Date: | 2021 |
| Country: | España |
| Institution: | Universidad de Huelva (UHU) |
| Repository: | Arias Montano. Repositorio Institucional de la Universidad de Huelva |
| Language: | English |
| OAI Identifier: | oai:ariasmontano.uhu.es:10272/19614 |
| Online Access: | http://hdl.handle.net/10272/19614 |
| Access Level: | Open access |
| Keyword: | Phosphogypsum Foamed bitumen NORM Environment Building materials |
| Summary: | The aim of this work was to use phosphogypsum (FY) waste in a sustainable paving practice involving the production of FY-foamed bitumen for road applications. For this proposal, three FY types coming from different fertilizer industries and a reference natural gypsum were used as foaming agents (10 wt%), including a small quantity of sulfuric acid (0.5 wt%) in the foamed bitumen formulation. The foaming properties and the rheological characterization of their corresponding binder residues were conducted by a distance laser sensor and by dynamic shear rheology, respectively. In addition, a physicochemical characterization of the used materials was carried out in order to evaluate their role in the final product. Knowing that FY is a Naturally Occurring Radioactive Material (NORM) waste, a comprehensive radioactive characterization, by both alpha and gamma spectrometry, and an environmental evaluation, by a Dynamic Surface Leaching Test (DSLT), were performed to comply with the EU radiological regulation of NORM materials for building materials. In conclusion, FY-foamed bitumen displayed enhanced engineering properties compared to that prepared with the reference natural gypsum, satisfying the radioactive and environmental specifications established according to the EU regulations. |
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