Cold In-Place Recycled Bituminous Pavement, Dorset-Danby, VT: Fid-Bau Portal

Cold In-Place Recycled Bituminous Pavement, Dorset-Danby, VT

J. Fitch / J. P. Tremblay

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