Performance Evaluation of a Heat-Scarified In-Place Recycled Bituminous Pavement, Route 15, Westport

摘要

The following report describes a heater-scarified recycling project on Rt. 15 in Westport, a 4-lane, limited access road built of PCC in 1934 and subsequently overlaid several times. The 2.92 mile project consists of two sections, heater-scarified and overlaid, one northbound and the other southbound, roughly adjacent to each other. On the northern 1800 ft of the project, the overlays are similar to the above, but are placed on the old bituminous paving without scarification. These are control sections. Crack surveys indicate that full-width transverse cracking predominates, apparently reflected upward from the old joints in the PCC. Joints sawed in the new overlays vary considerably from the old joint localities. Where sawing coincides with the old joint, transverse cracking is minimal. Friction numbers on all areas are high using the ASTM ribbed test tire, but lower on the Class 1 using the smooth test tire. It is concluded that the use of the heater-scarified recycled method was not cost-effective on this project.