Characterization of Strength and Long-Term Durability of Recycled Flex Base Materials

Recycled Crushed Concrete Aggregate (RCCA) and Reclaimed Asphalt Pavement (RAP) are two very common demolition wastes abundantly produced in the world, especially in the United States. Many consider these materials to have a high recycle potential and can be used as an alternative to, or in combination with, virgin aggregates in pavement base construction. However, limited studies have been conducted to evaluate the viability of using RCCA-RAP mixtures as an alternative flexible pavement base material. The objective of this study is to determine the structural competency and environmental soundness of the recycled base materials. Samples were prepared and cured for 7 days, then tested for Unconfined Compressive Strength, Resilient Modulus and Splitting Tensile Strength. Furthermore, durability tests were conducted by applying wetting-drying cycles on the prepared specimens. Leachate tests were conducted in periods as long as 23 days to address the environmental impact and deterioration effect due to wetting and drying cycles. Test results indicate that 100% RCCA at 4% cement content and 50-50% RAP-RCCA combination at 5.5% cement content meet the required strength and stiffness criteria of different guidelines. The leachate test results for all combinations of materials complied with the Environmental Protection Agency (EPA) guidelines.

  • Supplemental Notes:
    • This paper was sponsored by TRB committee AFP70 Standing Committee on Aggregates.
  • Corporate Authors:

    Transportation Research Board

    500 Fifth Street, NW
    Washington, DC  United States  20001
  • Authors:
    • Faysal, Mohammad
    • Hossain, Sahadat
    • Salah, Saif Bin
    • Khan, Mohammad Sadik
    • Flores, Carla Maria
  • Conference:
  • Date: 2017


  • English

Media Info

  • Media Type: Digital/other
  • Features: Figures; References; Tables;
  • Pagination: 19p
  • Monograph Title: TRB 96th Annual Meeting Compendium of Papers

Subject/Index Terms

Filing Info

  • Accession Number: 01625537
  • Record Type: Publication
  • Report/Paper Numbers: 17-04301
  • Files: TRIS, TRB, ATRI
  • Created Date: Dec 8 2016 11:38AM