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Industrial Validation and Mechanical Characterization of SMA Mixtures Stabilized with Recycled Polymeric Fibers from Waste Tires.

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Title: Industrial Validation and Mechanical Characterization of SMA Mixtures Stabilized with Recycled Polymeric Fibers from Waste Tires.
Authors: Calabi-Floody, Alejandra1,2 (AUTHOR) alejandra.calabi@ufrontera.cl, Valdés-Vidal, Gonzalo1,2 (AUTHOR), Mignolet-Garrido, Cristian1,2,3 (AUTHOR), Díaz-Montecinos, Cristian3,4 (AUTHOR), Fonseca-Ibarra, Claudio1,4 (AUTHOR)
Source: Polymers (20734360). Jan2026, Vol. 18 Issue 2, p156. 25p.
Subjects: Waste tires, Circular economy, Asphalt industry, Asphalt modifiers, Fatigue cracks, Fibers, Mechanical efficiency, Sustainability
Abstract: This study investigates the industrial validation of a granular additive derived from waste tire textile fibers (WTTF) developed to replace the conventional cellulose stabilizing additive in stone mastic asphalt (SMA) mixtures while enhancing their mechanical performance. Building on previous laboratory-scale findings, this work evaluates the feasibility and mechanical behavior of this recycled-fiber additive under real asphalt-plant production conditions, advancing a sustainable solution aligned with circular economy principles. Three asphalt mixtures were fabricated in a batch plant: a reference SMA (SMA-R) containing a commercial cellulose additive, an SMA incorporating the WTTF additive (SMA-F), and a reference hot mix asphalt (HMA-R). The WTTF additive was incorporated in a 1:1 proportion relative to the cellulose additive. Performance was assessed through tests of cracking resistance (Fénix test), stiffness modulus, fatigue resistance (four-point bending test), moisture susceptibility (ITSR), and resistance to permanent deformation (Hamburg wheel tracking). Industrial validation results showed that the SMA-F mixture met the design criteria and achieved superior mechanical performance relative to the reference mixtures. In particular, SMA-F exhibited greater ductility and toughness at low temperatures, reduced susceptibility to moisture-induced damage, and higher fatigue resistance, with an increase in fatigue durability of up to 44% compared to SMA-R. The results confirm that the WTTF additive is both feasible and scalable for industrial production, offering a solution that not only improves pavement mechanical performance but also promotes the valorization of a challenging waste material. [ABSTRACT FROM AUTHOR]
Copyright of Polymers (20734360) is the property of MDPI and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Label: Title
  Group: Ti
  Data: Industrial Validation and Mechanical Characterization of SMA Mixtures Stabilized with Recycled Polymeric Fibers from Waste Tires.
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  Data: <searchLink fieldCode="AR" term="%22Calabi-Floody%2C+Alejandra%22">Calabi-Floody, Alejandra</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<i> alejandra.calabi@ufrontera.cl</i><br /><searchLink fieldCode="AR" term="%22Valdés-Vidal%2C+Gonzalo%22">Valdés-Vidal, Gonzalo</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Mignolet-Garrido%2C+Cristian%22">Mignolet-Garrido, Cristian</searchLink><relatesTo>1,2,3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Díaz-Montecinos%2C+Cristian%22">Díaz-Montecinos, Cristian</searchLink><relatesTo>3,4</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Fonseca-Ibarra%2C+Claudio%22">Fonseca-Ibarra, Claudio</searchLink><relatesTo>1,4</relatesTo> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22Polymers+%2820734360%29%22">Polymers (20734360)</searchLink>. Jan2026, Vol. 18 Issue 2, p156. 25p.
– Name: Subject
  Label: Subjects
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  Data: <searchLink fieldCode="DE" term="%22Waste+tires%22">Waste tires</searchLink><br /><searchLink fieldCode="DE" term="%22Circular+economy%22">Circular economy</searchLink><br /><searchLink fieldCode="DE" term="%22Asphalt+industry%22">Asphalt industry</searchLink><br /><searchLink fieldCode="DE" term="%22Asphalt+modifiers%22">Asphalt modifiers</searchLink><br /><searchLink fieldCode="DE" term="%22Fatigue+cracks%22">Fatigue cracks</searchLink><br /><searchLink fieldCode="DE" term="%22Fibers%22">Fibers</searchLink><br /><searchLink fieldCode="DE" term="%22Mechanical+efficiency%22">Mechanical efficiency</searchLink><br /><searchLink fieldCode="DE" term="%22Sustainability%22">Sustainability</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: This study investigates the industrial validation of a granular additive derived from waste tire textile fibers (WTTF) developed to replace the conventional cellulose stabilizing additive in stone mastic asphalt (SMA) mixtures while enhancing their mechanical performance. Building on previous laboratory-scale findings, this work evaluates the feasibility and mechanical behavior of this recycled-fiber additive under real asphalt-plant production conditions, advancing a sustainable solution aligned with circular economy principles. Three asphalt mixtures were fabricated in a batch plant: a reference SMA (SMA-R) containing a commercial cellulose additive, an SMA incorporating the WTTF additive (SMA-F), and a reference hot mix asphalt (HMA-R). The WTTF additive was incorporated in a 1:1 proportion relative to the cellulose additive. Performance was assessed through tests of cracking resistance (Fénix test), stiffness modulus, fatigue resistance (four-point bending test), moisture susceptibility (ITSR), and resistance to permanent deformation (Hamburg wheel tracking). Industrial validation results showed that the SMA-F mixture met the design criteria and achieved superior mechanical performance relative to the reference mixtures. In particular, SMA-F exhibited greater ductility and toughness at low temperatures, reduced susceptibility to moisture-induced damage, and higher fatigue resistance, with an increase in fatigue durability of up to 44% compared to SMA-R. The results confirm that the WTTF additive is both feasible and scalable for industrial production, offering a solution that not only improves pavement mechanical performance but also promotes the valorization of a challenging waste material. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Polymers (20734360) is the property of MDPI and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
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      – Type: doi
        Value: 10.3390/polym18020156
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      – Code: eng
        Text: English
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      Pagination:
        PageCount: 25
        StartPage: 156
    Subjects:
      – SubjectFull: Waste tires
        Type: general
      – SubjectFull: Circular economy
        Type: general
      – SubjectFull: Asphalt industry
        Type: general
      – SubjectFull: Asphalt modifiers
        Type: general
      – SubjectFull: Fatigue cracks
        Type: general
      – SubjectFull: Fibers
        Type: general
      – SubjectFull: Mechanical efficiency
        Type: general
      – SubjectFull: Sustainability
        Type: general
    Titles:
      – TitleFull: Industrial Validation and Mechanical Characterization of SMA Mixtures Stabilized with Recycled Polymeric Fibers from Waste Tires.
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          Name:
            NameFull: Calabi-Floody, Alejandra
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            NameFull: Valdés-Vidal, Gonzalo
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            NameFull: Mignolet-Garrido, Cristian
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            NameFull: Díaz-Montecinos, Cristian
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            – D: 15
              M: 01
              Text: Jan2026
              Type: published
              Y: 2026
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