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Título
The use of copper slags as an aggregate replacement in asphalt mixes with RAP: Physical–chemical and mechanical behavioural analysis
Autor(es)
Materia
Copper slag
Reclaimed Asphalt Pavement
Physical-chemical characterization
Marshall stiffness
Indirect tensile strength
Resilient modulus
Clasificación UNESCO
3305.29 Construcción de Carreteras
3321.01 Materiales Asfálticos
3312.90 Materiales Metalúrgicos Avanzados
Fecha de publicación
2018-11-30
Citación
Raposeiras, A. C., Movilla-Quesada, D., Bilbao-Novoa, R., Cifuentes, C., Ferrer-Norambuena, G., & Castro-Fresno, D. (2018). The use of copper slags as an aggregate replacement in asphalt mixes with RAP: Physical–chemical and mechanical behavioural analysis. Construction and Building Materials, 190, 427-438. doi:10.1016/j.conbuildmat.2018.09.120
Resumen
[EN] Copper slag (CS) is a derivative of copper production that is mainly composed of heavy metals. The large
amount of this material accumulated around the world entails a serious environmental danger. Its use as
a replacement of mineral aggregate in asphalt mixtures would allow to increase the durability and resistance,
taking advantage of its physical-chemical properties. In this research, physicochemical analyses of
different combinations of CS, reclaimed asphalt pavements (RAP), asphalt cement and aggregates by XRay
Diffraction (XRD) and Fourier-Transform InfraRed spectroscopy (FT-IR) were developed.
Subsequently, Marshall stiffness ratio, indirect tensile strength (IDT) and resilient modulus tests were
performed to determine their implication in mechanical behaviour.
Asphalt mixes with ranges from 45 to 55% of recycled material have improved stability, Marshall Flow
and Stiffness ratio, obtaining values comparable with those from a conventional mixture. At the same
time, its resilient modulus and IDT values increased by 35% compared to conventional mixes. To maintain
values similar to conventional mixes, when the amount of RAP decreases the amount of CS should be
increased, with a maximum value of 35%. This behaviour is explained by the presence of fayalite and
magnetite in CS, which are hard, dense and hydrophobic components that produce increased elastic
deformation of the binder before breaking.
Descripción
Fuente: Construction and Building Materials
URI
ISSN
0950-0618
DOI
10.1016/j.conbuildmat.2018.09.120
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