Tie bars are typically placed after PCC using a tie bar inserter attachment (slip form only). When one lane at a time is paved, tie bars are inserted at mid-slab depth and bent back until the adjacent lane is ready to be paved. On slip form pavers, tie bars are inserted on slab edges that will become longitudinal joints and, if two lanes at once are being paved, pushed into a mid-slab area (similar to dowel bar insertion) that will later be cut as a longitudinal joint. Like dowel bars, tie bars should be protected from corrosion.
The longitudinal joint bar inserter inserts longitudinal joint tie bars to reinforce the concrete transverse to the paving direction. The side tie bar inserter inserts side tie bar in the side of concrete slab. All insertion processes are monitored electronically which ensures the correct position of all dowel bars inserted into the concrete slab.