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Title	Mining wastes to improve bitumen performances: An example of circular economy
ID_Doc	3514
Authors	Calandra, P; Quaranta, S; Figueira, BAM; Caputo, P; Porto, M; Rossi, CO
Title	Mining wastes to improve bitumen performances: An example of circular economy
Year	2022
Published
Abstract	Hypothesis: Inorganic small particles stemming from mineral extraction (i.e. mining waste) could be used as additive for road paving applications to improve bitumen mechanical properties. Such an approach is expected to increase bitumen life-cycle cutting costs connected to their preparation and to reduce environmental issues. Experiment: Bitumens containing various amounts (up to 10% w/w) of filler made of mining tailings fine powder were characterized by means of oscillatory rheometry focusing on the effect of the filler con-tent, temperature and filler milling time. Findings: (i) Superior resistance to stress, rutting, and fatigue were shown by the filler-containing mix-tures. In addition, higher durability was observed for the filler concentration of 10% w/w. These effects were interpreted on the grounds of the physico-chemical interactions between the bitumen and the inorganic filler suggesting important utilizations. (ii) The present research points towards a circular economy path. Particularly, this study demonstrates how an abundant and potentially harmful waste can be converted into a high value-added component for road paving. Furthermore, increased durability of bitumen is beneficial in both economic and environmental terms. (c) 2022 Elsevier Inc. All rights reserved.
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