How are tie bars positioned within cement concrete pavements______________?
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Answer: D. longitudinal joints
Explanation
Tie bars are deformed steel elements placed directly across longitudinal pavement joints. They hold adjacent concrete slabs tightly together to prevent lateral joint opening. This ensures load transfer and maintains the structural integrity of the pavement. Rigid pavements contain both transverse and longitudinal joints to control cracking. Tie bars are different from dowel bars, which are smooth and placed at transverse joints. Longitudinal joints separate lanes and prevent uncontrolled meandering cracks along the center.
Highway construction requires robust steel reinforcement details for long-lasting concrete pavements. Properly tied lanes prevent water infiltration and subbase erosion at joint interfaces. Civil engineers specify bar dimensions and spacing based on slab thickness and traffic. Expansion joints use smooth dowel bars with expansion caps rather than deformed tie bars. Contraction joints utilize dowel bars for load transfer without restricting horizontal movement. Warping joints accommodate slab curling stresses rather than holding longitudinal lanes together.
- Subject
- Engineering
- Category
- Civil Engineering
- Topic
- —
- Difficulty
- medium
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