GATE CE 2020 Set 1 — Question 41
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Transportation Engineering → Pavement Design → Rigid Design (IRC)
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Question
A dowel bar is placed at a contraction joint. When contraction occurs, the concrete slab cracks at predetermined location(s). Identify the arrangement, which shows the correct placement of dowel bar and the place of occurrence of the contraction crack(s).
Correct answer
(B) [figure]
Solution
Dowel bars are load transfer devices used in concrete pavements. They are placed at transverse joints to transfer loads from one slab to the next. For effective load transfer and to maintain adequate concrete cover, they are placed at the mid-depth of the slab (). Contraction joints are created by saw-cutting a groove of depth to at the top of the slab, which predetermines the location of the crack. Option B correctly shows the dowel bar at mid-depth and the crack occurring at the joint groove.
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