DMRC AM 2020
⭕ A. steel bars
⭕ B. tie bars
⭕ C. dowel bars
⭕ D. plastic bars
📚 Explanation:
Dowel bars are smooth round steel bars used at **expansion joints** and sometimes at **contraction joints** in cement concrete pavements.
🔹 They allow **load transfer** across joints.
🔹 They permit **horizontal movement**, needed due to temperature expansion and contraction.
🔹 Unlike tie bars, dowel bars do **not provide restraint** but only transfer load.
Dowel bars are smooth round steel bars used at **expansion joints** and sometimes at **contraction joints** in cement concrete pavements.
🔹 They allow **load transfer** across joints.
🔹 They permit **horizontal movement**, needed due to temperature expansion and contraction.
🔹 Unlike tie bars, dowel bars do **not provide restraint** but only transfer load.
👉 Therefore, the correct answer is: C. dowel bars
Key Points about Dowel Bars:
- Used at joints: Mainly expansion joints, sometimes contraction joints.
- Allows load transfer: Prevents differential settlement of slabs.
- Permits movement: Pavement expands/contracts without cracking.
