Strength and stiffness of recycled materials stabilised with fly ash: a laboratory study

Properties of a recycled pavement material (RPM) and a road surface gravel (RSG) stabilised with a Class C fly ash are compared with the properties of a conventional base material (Minnesota Class 5 base). California-bearing ratio (CBR), resilient modulus (Mr), and unconfined compressive strength (UCS tests were conducted to evaluate the effects of adding fly ash to the RPM and RSG to enhance their mechanical properties. Freeze–thaw durability was evaluated in terms of Mr and UCS. CBR, Mr, and UCS for RPM and RSG increased with fly ash content. Mr and UCS for RPM and RSG increased with curing time, with significant gains occurring after 7 and 28 days of curing. Addition of fly ash reduced plastic strains of the recycled materials during resilient modulus testing. Freeze–thaw cycling had a small effect on the Mr and UCS of the recycled materials. A strong relationship was found between summary resilient modulus (SRM) and UCS of recycled materials blended with fly ash, suggesting that the SRM can be estimated from a UCS test.

Language

  • English

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 01498689
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Oct 24 2013 3:00PM