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Valorization of the Zellidja Lead Smelter Slag (Eastern Morocco) in Road Building
https://orcid.org/http://orcid.org/0000-0002-5506-0989
In the mining village of Oued El Heimer in Morocco, the Zellidja lead smelter company has generated approximately three million tons of slag abandoned in nature without any means of management. In order to mitigate the risks of landfilling these by-products and for to solve the problem of increased requirements for granular materials, it is interesting to examine the possibility of valorization of the Zellidja slag in road building. For these reasons, the Gyratory compaction test, the Marshall test and the Duriez test were performed. The results obtained show that the optimal rate of the Zellidja slag used in asphalt concrete for base course (ACB) and in semi-grained bituminous concrete for surface course (SGBC) can reach 15%. This rate permitted to obtain mixtures with satisfactory performances. In terms of compaction, with 8.8% air void at 100 gyrations for the ACB and 8.6% air void at 60 gyrations for the SGBC. Concerning resistance to deformation, the Marshall stability values reach 12.28 kN for the ACB and 10.54 kN for the SGBC. As for the water resistance, the Duriez compressive strength ratio is 0.85 for the ACB and 0.88 for the SGBC. From an economic side, the cost of road structures can be reduced due to the capacity of slag to minimize the bitumen content. Regarding the environmental side, the leaching test showed that the concentrations of heavy metals leached from the asphalt specimens containing slag remain acceptable. Consequently, the present study proves the technical, economic and environmental feasibility of this valorization.
Valorization of the Zellidja Lead Smelter Slag (Eastern Morocco) in Road Building
https://orcid.org/http://orcid.org/0000-0002-5506-0989
In the mining village of Oued El Heimer in Morocco, the Zellidja lead smelter company has generated approximately three million tons of slag abandoned in nature without any means of management. In order to mitigate the risks of landfilling these by-products and for to solve the problem of increased requirements for granular materials, it is interesting to examine the possibility of valorization of the Zellidja slag in road building. For these reasons, the Gyratory compaction test, the Marshall test and the Duriez test were performed. The results obtained show that the optimal rate of the Zellidja slag used in asphalt concrete for base course (ACB) and in semi-grained bituminous concrete for surface course (SGBC) can reach 15%. This rate permitted to obtain mixtures with satisfactory performances. In terms of compaction, with 8.8% air void at 100 gyrations for the ACB and 8.6% air void at 60 gyrations for the SGBC. Concerning resistance to deformation, the Marshall stability values reach 12.28 kN for the ACB and 10.54 kN for the SGBC. As for the water resistance, the Duriez compressive strength ratio is 0.85 for the ACB and 0.88 for the SGBC. From an economic side, the cost of road structures can be reduced due to the capacity of slag to minimize the bitumen content. Regarding the environmental side, the leaching test showed that the concentrations of heavy metals leached from the asphalt specimens containing slag remain acceptable. Consequently, the present study proves the technical, economic and environmental feasibility of this valorization.
Valorization of the Zellidja Lead Smelter Slag (Eastern Morocco) in Road Building
https://orcid.org/http://orcid.org/0000-0002-5506-0989
In the mining village of Oued El Heimer in Morocco, the Zellidja lead smelter company has generated approximately three million tons of slag abandoned in nature without any means of management. In order to mitigate the risks of landfilling these by-products and for to solve the problem of increased requirements for granular materials, it is interesting to examine the possibility of valorization of the Zellidja slag in road building. For these reasons, the Gyratory compaction test, the Marshall test and the Duriez test were performed. The results obtained show that the optimal rate of the Zellidja slag used in asphalt concrete for base course (ACB) and in semi-grained bituminous concrete for surface course (SGBC) can reach 15%. This rate permitted to obtain mixtures with satisfactory performances. In terms of compaction, with 8.8% air void at 100 gyrations for the ACB and 8.6% air void at 60 gyrations for the SGBC. Concerning resistance to deformation, the Marshall stability values reach 12.28 kN for the ACB and 10.54 kN for the SGBC. As for the water resistance, the Duriez compressive strength ratio is 0.85 for the ACB and 0.88 for the SGBC. From an economic side, the cost of road structures can be reduced due to the capacity of slag to minimize the bitumen content. Regarding the environmental side, the leaching test showed that the concentrations of heavy metals leached from the asphalt specimens containing slag remain acceptable. Consequently, the present study proves the technical, economic and environmental feasibility of this valorization.
Valorization of the Zellidja Lead Smelter Slag (Eastern Morocco) in Road Building
Int. J. Pavement Res. Technol.
Moussaoui, Raja (author) / El Moudni El Alami, Souad (author) / Aouraghe, Hassan (author)
International Journal of Pavement Research and Technology ; 17 ; 1620-1636
2024-11-01
17 pages
Article (Journal)
Electronic Resource
English
Valorization of the Zellidja Lead Smelter Slag (Eastern Morocco) in Road Building
| Springer Verlag | 2024
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