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Performance analysis of cement-based sandwich composites with fiber-reinforced skins and rubberized concrete core from waste tire recycling.

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Title: Performance analysis of cement-based sandwich composites with fiber-reinforced skins and rubberized concrete core from waste tire recycling.
Authors: Sambucci, Matteo1,2 (AUTHOR) matteo.sambucci@uniroma1.it, Pini, Tommaso1,2 (AUTHOR), Tirillò, Jacopo1,2 (AUTHOR), Valente, Marco1,2 (AUTHOR)
Source: Journal of Sandwich Structures & Materials. May2026, Vol. 28 Issue 4, p625-648. 24p.
Subjects: Tire recycling, Cement composites, Mechanical behavior of materials, Thermal insulation, Fibrous composites, Interfacial bonding, Lightweight construction
Abstract: The demand for lightweight, energy-efficient, and sustainable construction materials has driven interest in cement-based sandwich composites incorporating waste-derived components. This study explores multi-layer sandwich systems integrating a rubberized cementitious core, made from 70% rubber powder and 30% granules derived from waste tires, with fiber-reinforced mortar skins. Short glass fibers and nanoclay-treated recycled carbon microfibers were investigated as reinforcements to enhance mechanical performance. The produced composites achieved lightweight concrete densities (1745–1781 kg/m3, per ACI 213R), making them ideal for semi-structural applications. Sandwich configuration successfully combined the high energy absorption of the rubberized cementitious core (up to 270% higher than reference mortars) with the structural role of the fiber-reinforced skins. Flexural strength of the sandwich composites improved by up to 195% over monolithic rubberized concrete samples, demonstrating the mechanical efficiency of the layered approach. However, challenges emerged at the interface between core and skins, where fiber-induced changes in fresh-state rheology compromised adhesion and caused interfacial microcracking, as confirmed by scanning electron microscopy. Thermal testing revealed that fiber-reinforced skins, particularly those incorporating short glass fibers, retained higher residual strength after exposure to elevated temperatures and, when integrated into the sandwich configuration, effectively counteracted the strength degradation of the rubberized cementitious core induced by thermal exposure. Moreover, the sandwich structure exhibited lower thermal conductivity, with skin-core delamination disrupting heat transfer and enhancing insulation. These findings confirm that sandwich composites with fiber-reinforced skins represent a promising and smart solution for manufacturing lightweight, thermally insulating, and impact-resistant construction components. Further optimization of fiber dispersion and interfacial bonding is essential to fully exploit their structural potential. [ABSTRACT FROM AUTHOR]
Copyright of Journal of Sandwich Structures & Materials is the property of Sage Publications Inc. 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.)
Database: Engineering Source
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Header DbId: egs
DbLabel: Engineering Source
An: 192559179
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
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  Label: Title
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  Data: Performance analysis of cement-based sandwich composites with fiber-reinforced skins and rubberized concrete core from waste tire recycling.
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  Data: <searchLink fieldCode="AR" term="%22Sambucci%2C+Matteo%22">Sambucci, Matteo</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<i> matteo.sambucci@uniroma1.it</i><br /><searchLink fieldCode="AR" term="%22Pini%2C+Tommaso%22">Pini, Tommaso</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Tirillò%2C+Jacopo%22">Tirillò, Jacopo</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Valente%2C+Marco%22">Valente, Marco</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22Journal+of+Sandwich+Structures+%26+Materials%22">Journal of Sandwich Structures & Materials</searchLink>. May2026, Vol. 28 Issue 4, p625-648. 24p.
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  Data: <searchLink fieldCode="DE" term="%22Tire+recycling%22">Tire recycling</searchLink><br /><searchLink fieldCode="DE" term="%22Cement+composites%22">Cement composites</searchLink><br /><searchLink fieldCode="DE" term="%22Mechanical+behavior+of+materials%22">Mechanical behavior of materials</searchLink><br /><searchLink fieldCode="DE" term="%22Thermal+insulation%22">Thermal insulation</searchLink><br /><searchLink fieldCode="DE" term="%22Fibrous+composites%22">Fibrous composites</searchLink><br /><searchLink fieldCode="DE" term="%22Interfacial+bonding%22">Interfacial bonding</searchLink><br /><searchLink fieldCode="DE" term="%22Lightweight+construction%22">Lightweight construction</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: The demand for lightweight, energy-efficient, and sustainable construction materials has driven interest in cement-based sandwich composites incorporating waste-derived components. This study explores multi-layer sandwich systems integrating a rubberized cementitious core, made from 70% rubber powder and 30% granules derived from waste tires, with fiber-reinforced mortar skins. Short glass fibers and nanoclay-treated recycled carbon microfibers were investigated as reinforcements to enhance mechanical performance. The produced composites achieved lightweight concrete densities (1745–1781 kg/m3, per ACI 213R), making them ideal for semi-structural applications. Sandwich configuration successfully combined the high energy absorption of the rubberized cementitious core (up to 270% higher than reference mortars) with the structural role of the fiber-reinforced skins. Flexural strength of the sandwich composites improved by up to 195% over monolithic rubberized concrete samples, demonstrating the mechanical efficiency of the layered approach. However, challenges emerged at the interface between core and skins, where fiber-induced changes in fresh-state rheology compromised adhesion and caused interfacial microcracking, as confirmed by scanning electron microscopy. Thermal testing revealed that fiber-reinforced skins, particularly those incorporating short glass fibers, retained higher residual strength after exposure to elevated temperatures and, when integrated into the sandwich configuration, effectively counteracted the strength degradation of the rubberized cementitious core induced by thermal exposure. Moreover, the sandwich structure exhibited lower thermal conductivity, with skin-core delamination disrupting heat transfer and enhancing insulation. These findings confirm that sandwich composites with fiber-reinforced skins represent a promising and smart solution for manufacturing lightweight, thermally insulating, and impact-resistant construction components. Further optimization of fiber dispersion and interfacial bonding is essential to fully exploit their structural potential. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Journal of Sandwich Structures & Materials is the property of Sage Publications Inc. 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: 10.1177/10996362251392793
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      – Code: eng
        Text: English
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      Pagination:
        PageCount: 24
        StartPage: 625
    Subjects:
      – SubjectFull: Tire recycling
        Type: general
      – SubjectFull: Cement composites
        Type: general
      – SubjectFull: Mechanical behavior of materials
        Type: general
      – SubjectFull: Thermal insulation
        Type: general
      – SubjectFull: Fibrous composites
        Type: general
      – SubjectFull: Interfacial bonding
        Type: general
      – SubjectFull: Lightweight construction
        Type: general
    Titles:
      – TitleFull: Performance analysis of cement-based sandwich composites with fiber-reinforced skins and rubberized concrete core from waste tire recycling.
        Type: main
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            NameFull: Sambucci, Matteo
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            NameFull: Pini, Tommaso
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            NameFull: Tirillò, Jacopo
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            NameFull: Valente, Marco
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            – D: 01
              M: 05
              Text: May2026
              Type: published
              Y: 2026
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              Value: 28
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            – TitleFull: Journal of Sandwich Structures & Materials
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