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<p>The present study investigates the use of waste tyres and recycled concrete aggregate (RCA) in pavement construction, addressing critical sustainability challenges in infrastructure development. Two reinforcing materials namely recycled tyre grid (RTG) and recycled tyre cell (RTC) were prepared from waste tyres and their performance was evaluated. RCA was used as a substitute for natural crushed aggregate (NCA) in the granular sub-base (GSB) layer. Laboratory pavement sections were constructed in both unreinforced (UR) and reinforced (RE) conditions, subjected to repeated load testing to assess the performance improvement. The incorporation of RTG, RTC, and RTG + RTC showed reduced plastic settlement and is in the order of 13.6–40.2% for NCA and 16.35–47.18% for RCA respectively when compared with their respective UR pavement section. RTG + RTC reinforced sections exhibited superior rutting resistance, attributed to the synergistic effects of confinement and tensioned membrane action. RCA demonstrated a higher improvement factor than NCA, likely due to its self-cementing properties. The provision of RTG, RTC and RTG + RTC reinforcement resulted in reduction in residual pressure by 24.6, 29.4 &amp; 40.4% in case of NCA and 30.9, 35.4 &amp; 41% in case of RCA respectively. Residual pressure profiles indicated that RE sections showed wider distribution of applied load in comparison with their respective UR section. Owing to the synergistic outcome of confinement effect and tensioned membrane action, RTG + RTC reinforcement outperformed RTG and RTC reinforcement in isolation. The analysis of pavement sections indicated significant improvements in performance, with fatigue life increased by 14.99–81.99% and rutting life increased by 9.49–61.27% for the reinforced sections. Overall, this research demonstrates the viability and benefits of incorporating waste tyres and RCA in pavement construction, offering a sustainable solution for waste management while enhancing pavement performance paving the way for eco-friendly, durable, and cost-effective infrastructure development.</p>

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Mechanical Evaluation of Granular Sub-base Reinforced with Recycled Tyres: A Way Towards Sustainability

  • 期刊论文

  • 发表日期：

    2025年5月20日

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  • Mohan Badiger,
  • K. H. Mamatha,
  • S. V. Dinesh

摘要

The present study investigates the use of waste tyres and recycled concrete aggregate (RCA) in pavement construction, addressing critical sustainability challenges in infrastructure development. Two reinforcing materials namely recycled tyre grid (RTG) and recycled tyre cell (RTC) were prepared from waste tyres and their performance was evaluated. RCA was used as a substitute for natural crushed aggregate (NCA) in the granular sub-base (GSB) layer. Laboratory pavement sections were constructed in both unreinforced (UR) and reinforced (RE) conditions, subjected to repeated load testing to assess the performance improvement. The incorporation of RTG, RTC, and RTG + RTC showed reduced plastic settlement and is in the order of 13.6–40.2% for NCA and 16.35–47.18% for RCA respectively when compared with their respective UR pavement section. RTG + RTC reinforced sections exhibited superior rutting resistance, attributed to the synergistic effects of confinement and tensioned membrane action. RCA demonstrated a higher improvement factor than NCA, likely due to its self-cementing properties. The provision of RTG, RTC and RTG + RTC reinforcement resulted in reduction in residual pressure by 24.6, 29.4 & 40.4% in case of NCA and 30.9, 35.4 & 41% in case of RCA respectively. Residual pressure profiles indicated that RE sections showed wider distribution of applied load in comparison with their respective UR section. Owing to the synergistic outcome of confinement effect and tensioned membrane action, RTG + RTC reinforcement outperformed RTG and RTC reinforcement in isolation. The analysis of pavement sections indicated significant improvements in performance, with fatigue life increased by 14.99–81.99% and rutting life increased by 9.49–61.27% for the reinforced sections. Overall, this research demonstrates the viability and benefits of incorporating waste tyres and RCA in pavement construction, offering a sustainable solution for waste management while enhancing pavement performance paving the way for eco-friendly, durable, and cost-effective infrastructure development.