What is a dowel in concrete construction?

What is a dowel in concrete construction?

• A. A metal conductor used for electrical grounding.
• B. Cylindrical steel bars used to transfer load between slabs.
• C. A plastic pin used to align forms.
• D. A type of expansion joint seal.

Answer: (B)

A dowel is a straight cylindrical steel bar that crosses a concrete joint to transfer load from one slab to the next while still allowing some movement at the joint. Its main job is to keep the two slabs aligned and to act like a hinge for shear transfer, so the structure behaves more like a single unit under load rather than two separate pieces rubbing against each other. Dowel bars are usually placed perpendicular to the joint and embedded in both slabs, with grout or bearing material around them to prevent concrete from crushing around the bar. They are typically smooth (plain) bars to allow sliding and rotation at the joint, and they’re protected to resist corrosion. This is different from electrical grounding conductors, plastic pins for form alignment, or expansion joint seals, which serve other purposes.

A dowel is a straight cylindrical steel bar that crosses a concrete joint to transfer load from one slab to the next while still allowing some movement at the joint. Its main job is to keep the two slabs aligned and to act like a hinge for shear transfer, so the structure behaves more like a single unit under load rather than two separate pieces rubbing against each other. Dowel bars are usually placed perpendicular to the joint and embedded in both slabs, with grout or bearing material around them to prevent concrete from crushing around the bar. They are typically smooth (plain) bars to allow sliding and rotation at the joint, and they’re protected to resist corrosion. This is different from electrical grounding conductors, plastic pins for form alignment, or expansion joint seals, which serve other purposes.