PERFORMANCE OF ONTARIO'S FIRST MAJOR REHABILITATION AND OVERLAY PROJECT

Abstract

The rehabilitation of concrete freeways has challenged highway authorities for many years. This challenge has been met with the utilization of various techniques such as full and partial depth repairs, diamond grinding and unbonded overlays. In 1989, the Ontario Ministry of Transportation constructed a project to demonstrate the feasibility of these techniques in their jurisdiction, and to monitor the long term performance of the various applications. The project incorporated the use of full depth and partial depth repairs followed by diamond grinding and joint sealant replacement on the northbound lanes (NBL). The southbound lanes (SBL) received an 180 mm thick plain jointed unbonded PCC (JPCP) overlay. The rehabilitation project has now been in service for three years and a number of performance characteristics have been monitored. These include pavement roughness and skid resistance with testing completed on an annual basis while pavement load response, condition surveys and noise emissions testing have been undertaken on an as need basis. The results of this testing and analysis are presented in this paper.