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Article

A Laboratory Assessment of the Influence of Crumb Rubber in Hot Mix Asphalt with Recycled Steel Slag

Department of Engineering and Architecture, University of Trieste, via Alfonso Valerio 6/2, 34127 Trieste, Italy
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Sustainability 2020, 12(19), 8045; https://doi.org/10.3390/su12198045
Received: 9 September 2020 / Revised: 25 September 2020 / Accepted: 28 September 2020 / Published: 29 September 2020
(This article belongs to the Special Issue Sustainable Pavement Materials and Technology)
To reduce thermal susceptibility and improve rutting and fatigue cracking resistance, increasingly more non-conventional additives and materials have been used in road pavement asphalt mixes in recent years. Non-conventional materials mainly include recycled materials, which reduce production costs and lead to environmental benefits related to their reuse. The aim of this research was to evaluate the influence of recycled tyre rubber in the production of asphalt concrete for road pavements built with recycled aggregates consisting of steel slag in relation to possible improvements in structural performance during operation (i.e., fatigue and rutting). Steel slag has a higher bulk specific gravity than natural aggregates, and it has a very porous surface that allows for a different interaction with the bitumen and the crumb rubber compared to traditional aggregates. To this end, two mixtures of asphalt concrete are compared. One was mixed with a modest percentage by weight of crumb rubber using the “dry” technique, and the other mixture did not contain crumb rubber. Indirect tensile and compression tests with cyclic loads were performed to determine the mechanical behaviour of the two mixtures at different temperatures and under different load frequencies. The results of this research indicate the better performance of the modified mixture with crumb rubber, which agrees with other experiments in the literature that have been made using natural aggregates. Furthermore, a significant increase in stiffness was found at high temperatures (up to 30%), a slight reduction (up to 8%) was found at low temperatures, and a reduction in permanent deformation was found under cyclic loads. View Full-Text
Keywords: crumb rubber; dry method; asphalt pavements; steel slag; mechanical properties; hot mix asphalt crumb rubber; dry method; asphalt pavements; steel slag; mechanical properties; hot mix asphalt
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MDPI and ACS Style

Crisman, B.; Ossich, G.; Lorenzi, L.D.; Bevilacqua, P.; Roberti, R. A Laboratory Assessment of the Influence of Crumb Rubber in Hot Mix Asphalt with Recycled Steel Slag. Sustainability 2020, 12, 8045. https://doi.org/10.3390/su12198045

AMA Style

Crisman B, Ossich G, Lorenzi LD, Bevilacqua P, Roberti R. A Laboratory Assessment of the Influence of Crumb Rubber in Hot Mix Asphalt with Recycled Steel Slag. Sustainability. 2020; 12(19):8045. https://doi.org/10.3390/su12198045

Chicago/Turabian Style

Crisman, Bruno, Giulio Ossich, Lorenzo D. Lorenzi, Paolo Bevilacqua, and Roberto Roberti. 2020. "A Laboratory Assessment of the Influence of Crumb Rubber in Hot Mix Asphalt with Recycled Steel Slag" Sustainability 12, no. 19: 8045. https://doi.org/10.3390/su12198045

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