Abstract
In the summer of 1989, the Ministry of Transportation of Ontario (MTO) undertook the rehabilitation ofan exposed concrete pavement exhibiting various distress manifestations. Highway 126 in Southwestern Ontario is a four-lane divided arterial with 25,000 AADT and 15% commercial traffic. The existing pavement, constructed in 1963, consisted of 230 mm mesh reinforced Portland Cement Concrete pavement with dowelled joints at a spacing of 21.3 m. The rehabilitation of the highway in the northbound lanes consisted of using the latest developments in portland cement concrete (PCC) rehabilitation design techniques, material specifications and construction methods. The southbound lanes received an unbonded PCC overlay. The rehabilitation techniques include full depth repair, partial depth repair, diamond grinding and joint sealant replacement on the northbound lanes which had experienced moderate deterioration. The southbound lanes received a 180 mm thick plain jointed unbonded PCC overlay to address the severe 'D' cracking and spalling at all the joints and cracks. This paper will discuss the seven year performance of this rehabilitated pavement in terms of roughness measurements using the Portable Universal Roughness Device, frictional resistance measured with the ASTM brake-force trailer, Pavement Condition Ratings and crack surveys. Also included will be a discussion on subsequent localized concrete pavement repair work completed on the highway during the seven years.
Published Version
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