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<p>Here we report the revitalization of aged asphalt roofing shingles by applying semi-epoxidized soybean oil (SESO) as an aqueous emulsion. We hypothesized that the reactivity of SESO oxirane with oxidized components of the shingle asphalt composition would improve durable performance through an internal plasticization mechanism. Using SESO emulsions at 10 wt% and 30 wt%, together with a 10 wt% soy-based methyl ester emulsion (SME) as an inert control, we applied 200&#xa0;mL/m<sup>2</sup> to 3-tab and architectural shingles in both new and 15 + year-aged states. Key performance metrics were grit adhesion, flexibility, crack, hail, and flame resistance. Although all treatments improved grit retention, both SESO-based emulsions significantly outperformed SME treatment in all other respects. All treatments reduced the flexural modulus due to plasticization; Aged samples treated with 10 wt% SESO and SME exhibited values comparable to new shingles. Although 30 wt% SESO-treated samples were overly softened, the 10 wt%-treated shingles exhibited restored ductility, hail resistance, and reduced flame spread compared to both SME-treated and untreated specimens. The results suggest that SESO is effective in penetrating and reacting with asphalt in aged shingles, restoring many key aspects of shingle performance to those of new shingles. This strategy could support the circular economy by extending the service life of asphalt shingles.</p> Graphic Abstract <p></p>

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Restoring Asphalt Shingle Integrity with Soybean Oil-Based Emulsions: A Case Study on Performance, Durability, and Sustainability

  • 期刊论文

  • 发表日期：

    2025年8月21日

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  • Baker Kuehl,
  • Andrew Becker,
  • Sharan Raman,
  • Anna McCaslin,
  • Jefferson Roberts-Dobie,
  • Michael Forrester,
  • Nacu Hernandez,
  • Austin Hohmann,
  • Ronald Williams,
  • Eric Cochran

摘要

Here we report the revitalization of aged asphalt roofing shingles by applying semi-epoxidized soybean oil (SESO) as an aqueous emulsion. We hypothesized that the reactivity of SESO oxirane with oxidized components of the shingle asphalt composition would improve durable performance through an internal plasticization mechanism. Using SESO emulsions at 10 wt% and 30 wt%, together with a 10 wt% soy-based methyl ester emulsion (SME) as an inert control, we applied 200 mL/m2 to 3-tab and architectural shingles in both new and 15 + year-aged states. Key performance metrics were grit adhesion, flexibility, crack, hail, and flame resistance. Although all treatments improved grit retention, both SESO-based emulsions significantly outperformed SME treatment in all other respects. All treatments reduced the flexural modulus due to plasticization; Aged samples treated with 10 wt% SESO and SME exhibited values comparable to new shingles. Although 30 wt% SESO-treated samples were overly softened, the 10 wt%-treated shingles exhibited restored ductility, hail resistance, and reduced flame spread compared to both SME-treated and untreated specimens. The results suggest that SESO is effective in penetrating and reacting with asphalt in aged shingles, restoring many key aspects of shingle performance to those of new shingles. This strategy could support the circular economy by extending the service life of asphalt shingles.

Graphic Abstract