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Circular Economy
• The pH value of the leachant affects directly anion and cation releases’ behaviour;
• Some common critical compounds of recycled concrete aggregates are sulphate, chromium, antimony and selenium. On the other hand, cadmium, mercury and lead usually present lower concentrations relative to their critical values.
Taking into account leaching tests currently used in RCA, it is important to define the purpose of the intended study prior to the definition of the test to be applied.
3. Acknowledgements
Authors are grateful for CERIS-ICIST’s support and that of Instituto Superior Técnico, Universidade de Lisboa. This work is financed by national funds through FCT - Fundação para a Ciência e a Tecnologia, I.P., with scholarship PD/BD/135258/2017.
4. References
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Butera S., Christensen T. H., and Astrup T. F. (2014) Composition and leaching of construction and demolition waste: Inorganic elements and organic compounds. J. Hazard. Mater., vol. 276, pp. 302–311.
Directive 2013/39/EU of 12 August 2013, vol. 2013, n. July. 2013, pp. 1–17.
Engelsen C. J., Van der Sloot H., Wibetoe G., Justnes H., Lund W., and Stoltenberg-Hansson E. (2010) Leaching
characterisation and geochemical modelling of minor and trace elements released from recycled concrete aggregates. Cem. Concr. Res., vol. 40, n. 12, pp. 1639–1649.
Newman M. C. and Unger M. A. (2003) Fundamentals of Ecotoxicology – Introduction. 2nd ed., Lewis Publishers, pp. 3–20.
Roque A. J., Martins I. M., Freire A. C., Neves J. M., and Antunes M. L. (2016) Assessment of environmental hazardous of construction and demolition recycled materials (C&DRM) from laboratory and field leaching tests application in road pavement layers. Procedia Eng., vol. 143, n. ICTG, pp. 204–211.
Saca N., Dimache A., Radu L. R., and Iancu I. (2017) Leaching behavior of some demolition wastes. J. Mater. Cycles Waste Manag., vol. 19, n. 2, pp. 623–630.
Van der Sloot H., Heasman L., and Quevauviller Ph. (editors) (1997). Harmonization of leaching/extraction tests. Amsterdam: Elsevier Science
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