Carpenter Red Seal Exam Prep · Question
What is the main function of a 'control joint' in a large concrete slab?
Control joints (or contraction joints) are intentionally cut grooves in concrete slabs that create weakened planes, encouraging cracks to form neatly along thes
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Question: What is the main function of a 'control joint' in a large concrete slab?
Answer options: ✅ To allow for planned cracking to occur in predictable patterns, minimizing unsightly or structural cracks.
- To prevent moisture from penetrating the slab.
- To provide a decorative pattern on the slab surface.
- To connect two separate concrete pours.
Correct answer: To allow for planned cracking to occur in predictable patterns, minimizing unsightly or structural cracks.
Explanation: Control joints (or contraction joints) are intentionally cut grooves in concrete slabs that create weakened planes, encouraging cracks to form neatly along these lines rather than randomly across the slab.
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