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Iowa State University--Becoming the Best

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

Woven geotextile for subgrade stabilization

Non-woven geotextile for subgrade stabilization

Biaxial geogrid for subgrade stabilization

Triaxial geogrid for subgrade stabilization

Geocell reinforcement of subbase


Principal investigators:

Co-principal investigators:

Student researcher:

Project status


Start date: 03/14/12
End date: 12/31/13



Related publications:



Partner(s): Iowa Department of Transportation, Boone County, Iowa Engineer

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:

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.