Abstract
In recent years, several studies and applications of recycled aggregates coming from Construction and Demolition (C&D) waste have been carried out, but the knowledge related to the long-term behaviour of these alternative materials is still fairly limited. Granulometric changes of recycled C&D materials, due to the breakage of particles induced by compaction and weather conditions, and the consequent modifications in their properties are frequently pointed out as an important issue regarding their field application. In order to study the evolution of the geotechnical and geoenvironmental properties of C&D recycled materials, small trial embankments were constructed with a mixed fine-grain C&D waste (0–10 mm). After 24 months of exposure to real weather conditions, the material was collected and the initial laboratory campaign was repeated. This paper compares geotechnical properties and the geoenvironmental behaviour of the original (as provided by the recycling plant) and collected C&D materials. The geotechnical assessment included particle size distribution, minimum and maximum void ratios and Proctor compaction parameters. The geoenvironmental characterization was achieved by laboratory leaching tests and pH assessment. The constituents of the recycled C&D waste were also evaluated. The results of this study pointed out that the changes over time of the geotechnical properties are not relevant. The geoenvironmental characterization showed that there are no environmental concerns related to groundwater contamination.
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Acknowledgements
This work was financially supported by: Project PTDC/ECI-EGC/30452/2017—POCI-01-0145-FEDER-030452—funded by FEDER funds through COMPETE2020—Programa Operacional Competitividade e Internacionalização (POCI) and by national funds (PIDDAC) through FCT/MCTES; Base Funding—UIDB/04708/2020 of the CON-STRUCT—Instituto de I&D em Estruturas e Construções—funded by national funds through the FCT/MCTES (PIDDAC).
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Vieira, C.S., Pereira, P.M., Cristelo, N. (2023). Changes Over Time in Geotechnical and Geoenvironmental Properties of a Recycled Construction and Demolition (C&D) Waste. In: Yukselen-Aksoy, Y., Reddy, K.R., Agnihotri, A.K. (eds) Sustainable Earth and Beyond. EGRWSE 2022. Lecture Notes in Civil Engineering, vol 370. Springer, Singapore. https://doi.org/10.1007/978-981-99-4041-7_38
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DOI: https://doi.org/10.1007/978-981-99-4041-7_38
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