EVALUATION OF FLY ASH IN COLD IN-PLACE RECYCLING

The Kansas Department of Transportation has developed an innovative method of rehabilitating pavements of low volume roads utilizing cold in-place recycling of the asphalt and mixing type C fly ash with the recycled material. Field test sections indicate fly ash improves constructability and moisture sensitivity as well as utilizing a by-product that currently ends up in landfills. The same field test sections have shown increased cracking with increased fly ash contents and a drop in pavement modulus with time. Reclaimed asphalt pavement (RAP) was mixed with 3, 7, 11 and 15% fly ash and the laboratory samples were evaluated for fatigue life, durability, freeze-thaw resistance and thermal cracking. The performance of RAP mixed with asphalt emulsion and asphalt emulsion plus hydrated lime was also evaluated. The results indicated that 7 to 11% fly ash provided optimal laboratory freeze-thaw and moisture sensitivity performance. Increasing the fly ash content resulted in more brittle fatigue behavior as well as an increased thermal fracture temperature. The use of AASHTO T283 is recommended for selecting the optimum fly ash content.

Language

  • English

Media Info

  • Features: Appendices; Figures; References; Tables;
  • Pagination: 112 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00728361
  • Record Type: Publication
  • Report/Paper Numbers: K-TRAN: KU-95-4, Final Report
  • Contract Numbers: C-695
  • Files: TRIS, STATEDOT
  • Created Date: Nov 4 1996 12:00AM