Precast pavements slabs offer a quick and durable method of replacing pavement and returning a roadway to service quickly. Slabs are available by select manufactures as both conventional reinforced and prestressed. Precast construction involves the installation of prefabricated concrete panels on grade. The panels themselves generally provide the final riding surface for the finished pavement and do not require an asphalt or cementitious overlay. They are typically used to replace existing pavement, but can also be used for new construction or to overlay existing pavement.
Precast panels are generally provided in sizes to match the width of one, two, or three lanes of the pavement, permitting one or multiple lanes of an existing pavement to be reconstructed at one time, depending on site clearance constraints. The precast panels are generally oriented transversely to the roadway centerline, and may also include shoulders. Panels may be prestressed in both directions. The panels are installed on a prepared base, connected (dowel bars or post-tensioned) together, and opened to traffic.
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