Question

A dowel bar is placed at a contraction joint. When contraction occurs, the concrete slab cracks at pre-determined location (s). Identify the arrangement which shows the correct placement of dowel bar and the place of occurrence of the contraction crack(s)

• A.
• B.
• C.
• D.

Answer 1

The correct option is B

Contraction joint serves as a pre-determined location for cracks when contraction occurs.

Dowel bars are placed at a depth equal to half the thickness of slab (d/2).