In 2004, the Ministry of Transportation Ontario (MTO) carried out a demonstration project to evaluate use of precast concrete pavement repairs in existing concrete pavement. The trial was carried out on Highway 427, a major urban freeway in Toronto. The project included demonstrations of three precast concrete pavement full-depth repair methods: the Fort Miller Super-Slab™ Intermittent Method, the Fort Miller Super-Slab™ Continuous Method, and the Michigan Method. Each method involves designing and fabricating precast concrete pavement slabs to replace deteriorated concrete pavement. The methods differ in how the base is prepared and how the precast slab is installed and dowelled into the existing concrete. Based on MTO experiences with the trial, a specification was developed and additional precast work was carried out in 2007 – 2009. These repairs were the first construction experience in Canada with innovative precast concrete slab repairs for concrete pavements. MTO has been monitoring the field performance of the precast slabs and assessing the cost effectiveness of this alternative to full-depth fast-track concrete repairs. This paper discusses the methodologies, site conditions, contract specifications, construction, and post-construction monitoring results.
