Carpenter Red Seal Exam Prep · Question
What is the purpose of a 'keyway' or 'keying' when pouring a new concrete wall on an existing footing?
A keyway is a groove formed in the footing (or first pour) that interlocks with the subsequent concrete pour, creating a mechanical bond that resists lateral sh
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Question: What is the purpose of a 'keyway' or 'keying' when pouring a new concrete wall on an existing footing?
Answer options: ✅ To create a mechanical bond between the old and new concrete, preventing lateral movement.
- To provide a path for rebar to connect the two pours.
- To allow for expansion and contraction of the concrete.
- To drain excess water from the wall footing.
Correct answer: To create a mechanical bond between the old and new concrete, preventing lateral movement.
Explanation: A keyway is a groove formed in the footing (or first pour) that interlocks with the subsequent concrete pour, creating a mechanical bond that resists lateral shear forces.
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