Which statement best explains tie bars in pavement reinforcement?

• A. They connect adjacent slabs to transfer shear across joints
• B. They are decorative
• C. They anchor to the formwork
• D. They improve color

Answer: (A)

Tie bars are placed to keep adjacent pavement slabs connected so they act as a single unit under traffic loads. When a wheel load causes one slab to try to move relative to its neighbor, the joint would open without something bridging it. The tie bar bridges that joint, transferring shear between the two slabs and helping maintain alignment, which reduces joint opening, faulting, and eventual spalling over time. They’re embedded in the concrete on either side of the joint and spaced per design.

They aren’t decorative, nor are they used to anchor formwork or change the pavement color. In pavement construction, the tying function is about keeping slabs from separating and ensuring the joint behaves as part of the continuous pavement.