Precast Concrete Slab Repair Methods

摘要

En 2004, el Ministerio de Transportes de Ontario llevó a cabo un ensayo destinado a evaluar tres técnicas de construcción para la reparación de las losas prefabricadas de hormigón en pavimentos de hormigón: el Método Michigan, el Método Intermitente para Super Losas~® Fort Miller y el Método Continuo para Super Losas~® Fort Miller. Los métodos se diferenciaban en la preparación de la base y en la instalación de la losa prefabricada y centrada con pasadores al hormigón adyacente. Se presentan los resultados de la instalación de reparación junto con los resultados de las pruebas no destructivas destinadas a determinar la eficiencia de la transferencia de la carga a través de las juntas.%Executing fast track pavement repairs using high-early-strength concrete can be a challenge, particularly in cold weather. Also, the long-term durability of such repairs has been an ongoing concern. Because repairs made with precast concrete could offer higher quality concrete, better curing conditions, minimal weather restrictions on placement, and reduced delay prior to opening to traffic, the Ministry of Transportation Ontario (MTO) decided to carry out trial evaluations of three precast concrete pavement repair methods. The trials were conducted in November 2004 on the northbound express lane 3 of Highway 427, a major urban freeway running north and south through Toronto, ON, Canada. Heavy traffic volume dictated that the repairs be carried out overnight. Following construction, nondestructive testing was undertaken to assess load transfer efficiency at the pavement joints and detect loss of support beneath the slab.