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

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  • Bruno Crisman

    (Department of Engineering and Architecture, University of Trieste, via Alfonso Valerio 6/2, 34127 Trieste, Italy)

  • Giulio Ossich

    (Department of Engineering and Architecture, University of Trieste, via Alfonso Valerio 6/2, 34127 Trieste, Italy)

  • Lorenzo De Lorenzi

    (Department of Engineering and Architecture, University of Trieste, via Alfonso Valerio 6/2, 34127 Trieste, Italy)

  • Paolo Bevilacqua

    (Department of Engineering and Architecture, University of Trieste, via Alfonso Valerio 6/2, 34127 Trieste, Italy)

  • Roberto Roberti

    (Department of Engineering and Architecture, University of Trieste, via Alfonso Valerio 6/2, 34127 Trieste, Italy)

Abstract

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.

Suggested Citation

  • Bruno Crisman & Giulio Ossich & Lorenzo De Lorenzi & Paolo Bevilacqua & Roberto Roberti, 2020. "A Laboratory Assessment of the Influence of Crumb Rubber in Hot Mix Asphalt with Recycled Steel Slag," Sustainability, MDPI, vol. 12(19), pages 1-21, September.
    • Handle: RePEc:gam:jsusta:v:12:y:2020:i:19:p:8045-:d:421560
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    References listed on IDEAS

    as
    1. Luzana Brasileiro & Fernando Moreno-Navarro & Raúl Tauste-Martínez & Jose Matos & Maria del Carmen Rubio-Gámez, 2019. "Reclaimed Polymers as Asphalt Binder Modifiers for More Sustainable Roads: A Review," Sustainability, MDPI, vol. 11(3), pages 1-20, January.
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    Cited by:

    1. Carlos D. A. Loureiro & Caroline F. N. Moura & Mafalda Rodrigues & Fernando C. G. Martinho & Hugo M. R. D. Silva & Joel R. M. Oliveira, 2022. "Steel Slag and Recycled Concrete Aggregates: Replacing Quarries to Supply Sustainable Materials for the Asphalt Paving Industry," Sustainability, MDPI, vol. 14(9), pages 1-31, April.
    2. Mujasim Ali Rizvi & Ammad Hassan Khan & Zia ur Rehman & Aasim Inam & Zubair Masoud, 2021. "Evaluation of Linear Deformation and Unloading Stiffness Characteristics of Asphalt Mixtures Incorporating Various Aggregate Gradations," Sustainability, MDPI, vol. 13(16), pages 1-21, August.
    3. Ramon Botella, 2022. "Sustainable Pavement Materials and Technology," Sustainability, MDPI, vol. 14(11), pages 1-2, May.
    4. Mujasim Ali Rizvi & Ammad Hassan Khan & Zia ur Rehman & Zubair Masoud & Aasim Inam, 2021. "Effect of Fractured Aggregate Particles on Linear Stress Ratio of Aggregate and Resilience Properties of Asphalt Mixes—A Way Forward for Sustainable Pavements," Sustainability, MDPI, vol. 13(15), pages 1-28, August.
    5. Yangsen Cao & Aimin Sha & Zhuangzhuang Liu & Fan Zhang & Jiarong Li & Hai Liu, 2022. "Thermal Conductivity Evaluation and Road Performance Test of Steel Slag Asphalt Mixture," Sustainability, MDPI, vol. 14(12), pages 1-19, June.

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