Tie Bar Placement Guide
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Tie bars are used to hold together abutting concrete slabs and prevent them from separating or allowing differential deflection. They are typically 0.5 inches in diameter and 24-40 inches long. Tie bars are placed mid-depth of the slab at longitudinal joints between lanes or at edges meeting a curb or shoulder. They are inserted a few inches away from transverse reinforcing bars to avoid hitting them. Tie bars are manually placed before paving and half is embedded in the first slab poured while the other half sticks out for the next slab.
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Tie Bar Placement Guide
- 1. JUNA YUSUF TIE BAR PLACEMENT By Teacher Juna Yusuf
- 2. What is tie bars ? Deformed steel bars or deformed epoxy coated steel . JUNA YUSUF Function : Hold the faces of abutting slabs in contact Not designed to act as load transfer devices.
- 3. between an edge joint at longitudinal joints – mid depth of slab JUNA YUSUF a curb or shoulder Where? Measurement : 12.5 mm (0.5 inches) in diameter and between 0.6 and 1.0 m (24 & 40 inches long).
- 4. About tie bar … Prevent lanes from separation & differential deflections Reduce transverse cracking JUNA YUSUF Machine-‐place: Placed by hand; Chairs; Drilled & grouted If tie bars inserted exactly at transverse bar location, there a higher chance of hitting the transverse bars. A better practice to insert tie bars a few inches away from transverse bar locations.
- 5. What is the difference between tie bars and dowel bars in concrete carriageway? • Tie bars : deformed rebars or connectors used for holding faces of rigid slabs in contact to maintain aggregate interlock. Tie bars not load transferring device. For instance, tie bars are used in longitudinal joints in concrete pavement. JUNA YUSUF • Dowel bars are smooth round bars mainly serve as load transfer device across concrete joints. Placed across transverse joints of concrete pavement to allow movement to take place. Movement purposely designed for longitudinal joints, dowel bars can be adopted.
- 6. JUNA YUSUF Spacing of the transverse reinforcing steel & spacing of the tie bars match. Before paving ,Tie bars will be placed at the paintmarks during paving. Half tie bar length was embedded into concrete. The other half sticks out, ready to be cast in the adjacent concrete placement -‐ tie bars manually inserted into the plastic concrete during paving operation.
- 7. Tie bars also used in plain jointed concrete pavement to connect two lanes, @ a lane & shoulder tie bar mechanically inserted by JUNA YUSUF paving machine into fresh concrete ahead of the float or it held in position by support devices. CRCP, there is not an available mat of steel reinforcement that can be used to position and secure the tie bars.