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oai:gredos.usal.es:10366/1551222025-04-30T20:18:26Zcom_10366_4368com_10366_4349com_10366_3946com_10366_3823col_10366_4369

Muñoz-Cáceres, Osvaldo Andrés-Valeri, Valerio C. Lagos-Varas, Manuel Raposeiras, Aitor Movilla-Quesada, Diana 2024-01-31T18:26:50Z 2024-01-31T18:26:50Z 2021-09-01 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 0301-4797 http://hdl.handle.net/10366/155122 10.1016/j.jenvman.2021.112867 Fuente: Journal of Environmental Management [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. CONICYT, Comisión Nacional de Investigación Científica y Tecnológica de Chile eng Attribution-NonCommercial-NoDerivatives 4.0 Internacional http://creativecommons.org/licenses/by-nc-nd/4.0/ info:eu-repo/semantics/openAccess Copper slag Particle size Asphalt mixture Moisture damage Ageing Thermal susceptibility 3321.01 Materiales Asfálticos 3305.29 Construcción de Carreteras 3312.90 Materiales Metalúrgicos Avanzados Production of asphalt mixes with copper industry wastes: Use of copper slag as raw material replacement info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion https://doi.org/10.1016/j.jenvman.2021.112867 Proyecto FONDECYT Iniciación 11140889 Journal of Environmental Management 293 112867