THE REHABILITATION OF A CONCRETE PAVEMENT USING IN-PLACE RUBBLIZATION AND COLD RECYCLING TECHNOLOGIES

ABSTRACT In 1998, a 19 km portion of Highway 2 located between Woodstock and Thamesford was transferred from the provincial jurisdiction to the County of Oxford, Ontario. County Road 2 was a concrete pavement with 75 mm of hot mix asphalt surfacing. The pavement serviceability was considered poor mainly due to the multiple active joints and rocking of the concrete slabs. In 1999, the County of Oxford made the decision to restore the serviceability of the new County Road 2 using a rehabilitation method that would provide smooth ride, mitigate cracking and eliminate the rocking effect of the concrete slabs. The retained rehabilitation strategy included rubblization of the concrete pavement, cold recycling of the old hot mix asphalt surfacing and placement of new hot mix asphalt surfacing. The rehabilitation of County Road 2 was carried out in three phases and the last phase was completed in the summer of 2001. The experience acquired with every phase of work contributed to define and optimized a construction method that minimizes both, the rehabilitation costs and the construction risks associated with the break up of the concrete pavement structure. This paper presents an overview of the approach undertaken by the County of Oxford to establish a pavement rehabilitation strategy and the step taken to optimize the usage of rubblization and cold recycling of the old hot mix asphalt surfacing