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.

• Record URL:
  http://kdot1.ksdot.org/idmws/DocContent.dll?Library=PublicDocs^dt00mx38&ID=003670407
• Corporate Authors:

  University of Kansas, Lawrence

  Department of Civil, Environmental and Architectural Engineering
  1530 West 15th Street
  Lawrence, KS  United States  66045-7609

  Kansas Department of Transportation

  Docking State Office Building
  Topeka, KS  United States  66612
• Authors:
  • Cross, S A
• Publication Date: 1996-4

Language

• English

Media Info

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

Subject/Index Terms

• TRT Terms: Asphalt emulsions; Asphalt pavements; Calcium hydroxide; Cold in-place recycling; Cold weather; Construction; Driver rehabilitation; Fatigue (Mechanics); Fly ash; Freeze thaw durability; Laboratory tests; Low volume roads; Moisture content; Pavement cracking; Recycling; Test sections
• Identifier Terms: American Association of State Highway Officials
• Uncontrolled Terms: Constructability; Fatigue life; Moisture sensitivity; Rehabilitation
• Old TRIS Terms: Aashto t283
• Subject Areas: Construction; Design; Highways; Maintenance and Preservation; Pavements; I22: Design of Pavements, Railways and Guideways; I23: Properties of Road Surfaces; I61: Equipment and Maintenance Methods;

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