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<p>This laboratory study aimed to assess the feasibility of tuff and reclaimed asphalt pavement (RAP) mixtures in road construction. The study included a comprehensive analysis of the geotechnical properties of the tuff-RAP mixture, such as the material’s particle size distribution, density, compaction behavior, shear strength, and California bearing ratio (CBR). It was observed that the overall behavior of the tuff-RAP samples increased with increasing RAP content. Direct shear test results indicated that the incorporation of RAP into tuff significantly enhanced the material’s shear strength. The asphalt-coated aggregates in RAP contributed to an increase in cohesion by creating a binding effect between particles. However, as the RAP content increased, a reduction in the internal friction angle was observed. Among the tested mixtures, the addition of 30% RAP was identified as the optimal value for use in sub-base layers. This specific combination not only maximized the cohesion of the mixture but also yielded the highest CBR values, indicating superior load-bearing capacity and resistance to deformation. Empirical equations are proposed in this study to correlate the mechanical characteristics of tuff and RAP mixtures for use in road sub-base layer construction.</p>

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Implications of Local Materials Enhanced with Reclaimed Asphalt Pavement for Road Construction

  • 期刊论文

  • 发表日期：

    2025年3月28日

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  • Hamou Azaiez,
  • Abdellah Cherif Taiba,
  • Youcef Mahmoudi,
  • Mostefa Belkhatir

摘要

This laboratory study aimed to assess the feasibility of tuff and reclaimed asphalt pavement (RAP) mixtures in road construction. The study included a comprehensive analysis of the geotechnical properties of the tuff-RAP mixture, such as the material’s particle size distribution, density, compaction behavior, shear strength, and California bearing ratio (CBR). It was observed that the overall behavior of the tuff-RAP samples increased with increasing RAP content. Direct shear test results indicated that the incorporation of RAP into tuff significantly enhanced the material’s shear strength. The asphalt-coated aggregates in RAP contributed to an increase in cohesion by creating a binding effect between particles. However, as the RAP content increased, a reduction in the internal friction angle was observed. Among the tested mixtures, the addition of 30% RAP was identified as the optimal value for use in sub-base layers. This specific combination not only maximized the cohesion of the mixture but also yielded the highest CBR values, indicating superior load-bearing capacity and resistance to deformation. Empirical equations are proposed in this study to correlate the mechanical characteristics of tuff and RAP mixtures for use in road sub-base layer construction.