Boone County, Iowa
Federal Highway Administration State Planning and Research Funding
Iowa Department of Transportation
About the research
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.
Brent Pharesbphares@iastate.edu email >
Bridge Research Engineer, BEC
About the research
With the assistance of the Iowa DOT and Iowa State University Bridge Engineering Center, Boone County, Iowa will construct a multispan bridge using rapid construction techniques. This bridge will replace an existing Marsh Arch bridge located on 120th St. over Squaw Creek in Boone County. Field monitoring will be performed on the subject bridge to help in assessing the behavior of the individual elements during construction, the long-term performance of the individual components, and long-term performance and overall behavior of the completed bridge.