Evaluating Performance and Life Cycle Cost Efficiency of Flexible Pavements with Recycled Materials

Abstract: The integration of recycled materials into flexible pavement systems offers significant environmental and economic benefits. However, widespread adoption is hindered by concerns regarding long-term performance and cost-effectiveness. This study aims to address these concerns by investigating the mechanical properties, durability, and economic viability of flexible pavements incorporating high proportions of recycled rubber and reclaimed asphalt pavements (RAP).

The research focuses on evaluating the performance of these materials in terms of fatigue resistance, rutting, and cracking under various climatic conditions, which are crucial to their long-term use in California’s diverse environments. Laboratory and field testing will be conducted to measure the mechanical properties and structural integrity of flexible pavements with different recycled material compositions. These results will be compared against standard flexible pavement systems to determine the extent to which recycled materials can match or exceed traditional performance metrics.

In addition to performance evaluation, the study will conduct a comprehensive Life Cycle Cost Analysis (LCCA) to assess the long-term economic benefits of using recycled rubber and RAP in pavement construction and rehabilitation projects. This analysis will account for initial construction costs, maintenance requirements, and long-term durability, providing a full picture of the financial trade-offs associated with recycled material use. Special attention will be given to potential cost savings from reduced raw material use, lower environmental impact, and reduced maintenance cycles, balanced against any potential risks of premature failure or reduced performance.

The outcomes of this research will provide actionable recommendations for Caltrans and other state transportation agencies on how to optimize the use of recycled materials in flexible pavement design. By addressing both environmental sustainability and cost-efficiency, this study seeks to support the broader adoption of recycled materials in pavement engineering without compromising long-term pavement performance. The findings will also inform policy guidelines for sustainable infrastructure development and contribute to the reduction of the overall carbon footprint of California’s road network.

This study bridges the gap between sustainability goals and engineering performance, offering a practical framework for enhancing the environmental and economic sustainability of pavement systems while ensuring their durability in the face of diverse climate challenges.