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<p>Reclaimed asphalt pavement (RAP) reduces the performance of concrete because of the presence of asphalt coat on the aggregate surface. This asphalt binder weakens the interfacial transition zone and increases micropores. Benzene can remove asphalt binder effectively, but they raise serious toxicity concerns. This study evaluates xylene as a comparatively safer alternative to benzene. Xylene achieved a comparable asphalt binder removal efficiency up to 4.6% at a similar cost. Two-way ANOVA confirmed that solvent type significantly affects bitumen removal efficiency. Extraction time showed no statistically significant effect. Concrete with 50% untreated RAP exhibited up to 39% lower compressive strength and up to 49% lower flexural strength than the control mix. The compressive strength matched the control and flexural strength differed by only 3% with xylene pretreatment. Therefore, xylene pretreatment provides an efficient and practical pathway for RAP concrete.</p>

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Innovative Use of Xylene for Binder Removal in Reclaimed Asphalt Pavement Aggregates for Concrete

  • 期刊论文

  • 发表日期：

    2026年5月3日

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  • Komal V. Bhandakkar,
  • D. Sita Rami Reddy,
  • Udit Jain

摘要

Reclaimed asphalt pavement (RAP) reduces the performance of concrete because of the presence of asphalt coat on the aggregate surface. This asphalt binder weakens the interfacial transition zone and increases micropores. Benzene can remove asphalt binder effectively, but they raise serious toxicity concerns. This study evaluates xylene as a comparatively safer alternative to benzene. Xylene achieved a comparable asphalt binder removal efficiency up to 4.6% at a similar cost. Two-way ANOVA confirmed that solvent type significantly affects bitumen removal efficiency. Extraction time showed no statistically significant effect. Concrete with 50% untreated RAP exhibited up to 39% lower compressive strength and up to 49% lower flexural strength than the control mix. The compressive strength matched the control and flexural strength differed by only 3% with xylene pretreatment. Therefore, xylene pretreatment provides an efficient and practical pathway for RAP concrete.