United States Department of Transportation
i
Polyurethane foam for roadway stabilization NH Route 129, Loudon, NH.
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2016-12-12
[PDF-2.88 MB]
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Edition:Final report
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Abstract:This report summarizes the evaluation of the performance of polyurethane foam as a method of roadway
stabilization for a rural roadway experiencing substantial frost heaving.
NHDOT is responsible for many roads which have evolved from gravel roadways and were not constructed with a
full aggregate layer. These “unconstructed” roads often experience significant to severe frost heaving due to poor
soil conditions and/or inadequate drainage.
Segments of NH Route 129 received polyurethane injection in 2011 and 2013. Observations of the roadway
indicated rutted conditions begin to return after several years, meaning that the soil displacements continue to
occur in the spring as the frost leaves the soil.
The goal of the treatment was to improve stability to the point where the roadway could be considered as a
candidate for pavement preservation treatments. The failure to meet that goal means that the cost benefits of the
resulting improvements are not adequate to implement this research.
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