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Título
Production of asphalt mixes with copper industry wastes: Use of copper slag as raw material replacement
Autor(es)
Materia
Copper slag
Particle size
Asphalt mixture
Moisture damage
Ageing
Thermal susceptibility
Clasificación UNESCO
3321.01 Materiales Asfálticos
3305.29 Construcción de Carreteras
3312.90 Materiales Metalúrgicos Avanzados
Fecha de publicación
2021-09-01
Citación
Raposeiras, A. C., Movilla-Quesada, D., Muñoz-Cáceres, O., Andrés-Valeri, V. C., & Lagos-Varas, M. (2021). Production of asphalt mixes with copper industry wastes: Use of copper slag as raw material replacement. Journal of Environmental Management, 293, 112867. doi:10.1016/j.jenvman.2021.112867
Resumen
[EN] Copper slag is a waste obtained from copper production and it has a limited use, being mainly accumulated in
landfills on a massive scale. This material presents a high hardness and it has hydrophobic properties, so it can be
used as aggregate replacement in the production of asphalt mixtures. However, each size of copper slag behaves
differently when used in asphalt mixes, especially under changing conditions of moisture or temperature. Precisely
these climatic factors directly affect the service life of asphalt pavements. In this research, semi-dense
graded asphalt mixtures were produced with copper slag as replacement of aggregates, varying the particle
sizes used in the range from 2.5 to 0.08 mm to determine the size of copper slag with the best performance.
Indirect tensile strength tests were used to analyze samples subjected to different moisture and temperature
conditions and ageing degrees. The results show that copper slag can be used as aggregate replacement in asphalt
mixes when the proper size is selected. The strength of the asphalt mixture increased as the size of the copper slag
increased, especially under variable moisture and ageing conditions. Superior behaviour compared to a reference
mixture was obtained when replacing the size of aggregate No. 8 with copper slag, increasing its indirect tensile
strength and retained strength, reducing its stiffness under all the ageing periods, and being equally effective at
the different temperatures, which results in mixtures with improved durability and delayed cracking. Furthermore,
it would help to reduce between 15 and 20% of the virgin aggregate needed to produce asphalt mixes and
it would also allow reducing the accumulated volume of this waste, decreasing the environmental impact of both
industries.
Descripción
Fuente: Journal of Environmental Management
URI
ISSN
0301-4797
DOI
10.1016/j.jenvman.2021.112867
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