A street, only a few years old, has already developed a large number of cracks across corners. How can this be fixed so that it doesn't happen again?
Corner cracks are usually caused by heavy traffic over a corner that does not have adequate support. Support may have been lost because the slab curled, because the subbase was not originally compacted properly, or because of the phenomenon of pumping of sloshy subbase material up through the crack by the action of traffic in wet weather. Corner cracks may occur either at the edge of the slab or where the transverse joint intersects with the longitudinal joint. If nothing is done about them they work themselves free and sink. At the edge of the pavement they may move horizontally as well. They can be repaired by the process of slab jacking or by removal and replacement. Slabjacking was described in the article "Slabjacking Art and Science," in the February 1969 issue of Concrete Construction, page 53.