United States Department of Transportation
i
Cold in-place recycled bituminous pavement Dorset-Danby, VT.
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2015-01-01
[PDF-2.22 MB]
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Abstract:The report documents the long-term performance and cost effectiveness of four rehabilitation
treatments in a mostly homogenous environment. The underlying subbase and subgrade soils, traffic
volume, existing pavement structure and ambient conditions are similar in all sections. The Vermont
Agency of Transportation specified the construction of a standard overlay, cold recycled pavement, and
reclaimed stabilized base along US Route 7 in the towns of Dorset, Mt. Tabor and Danby in 1996 and
1997. Each of these treatments is intended to address various pavement distresses.
Testing and surveillance measures included annual pavement surveys prior to and following
construction along with the collection of IRI reading by Pavement Management with the use of a road
profiler. Sixteen 100’ test sections were established throughout the length of the project. Associated
pavement surveys included the documentation of cracking and rutting. Cracking was further analyzed
for total cracking, fatigue cracking and transverse cracking. Thirteen years following construction, only
three of the six pavement composites display measurable amounts of fatigue and transverse cracking
including the standard overlay, 3-inch CIR with 1½-inch overlay and 4-inch CIR with 1½-inch overlay.
Two of the more comprehensive treatments, 4-inch CIR and 8-inch RSB with 3¼-inch bituminous
overlay, displayed the greatest amount of rutting as a function of preconstruction conditions. Through
the metrics developed in the study, the treatments with the thicker bituminous overlays outperformed
the thinner overlays.
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