Boone County Expo Research Phase I - Granular Road Compaction and Stabilization

Project Investigators

David White, Pavana Vennapusa


Peter Becker

Project Schedule

Mar 2012 to Dec 2013


Boone County, Iowa, Federal Highway Administration State Planning and Research Funding, Iowa Department of Transportation


chemical stabilization, geosynthetic, in situ testing, intelligent compaction, soil stabilization

Project Description

The Iowa Department of Transportation (DOT) worked with its research partners to design comparative pavement foundation test sections at the Central Iowa Expo Site in Boone, Iowa. The project was constructed from May through July 2012. Sixteen different 700 ft long test sections were constructed on 4.8 miles of roadway with the following goals:

  • Construct a test area that will allow long-term performance monitoring
  • Develop local experience with new stiffness measurement technologies to assist with near-term implementation
  • Increase the range of stabilization technologies to be considered for future pavement foundation design to optimize the pavement system

The test sections involved using the following stabilization technologies: woven and non-woven (NW) geosynthetic materials; triaxial and biaxial geogrids; 4 in. and 6 in.  geocells + non-woven geosynthetics; portland cement (PC) and fly ash (FA) stabilization; PC stabilization of recycled subbase layer; PC + fiber stabilization of the subbase layer with polypropylene (PP) fibers and monofilament-polypropylene (MF-PP) fibers; mechanical stabilization; and high-energy impact compaction.