Carpenter Red Seal Exam Prep · Question
What is the primary indicator that freshly placed concrete has gained sufficient strength to allow for the safe removal of vertical formwork (e.g., wall forms)?
Form removal timing is determined by the concrete's strength. Vertical forms can often be removed sooner than horizontal forms once the concrete has reached a s
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Question: What is the primary indicator that freshly placed concrete has gained sufficient strength to allow for the safe removal of vertical formwork (e.g., wall forms)?
Answer options:
- The surface of the concrete appears dry.
- 24 hours have passed since the pour. ✅ The concrete has achieved a specified percentage of its design compressive strength.
- The external air temperature has remained above freezing.
Correct answer: The concrete has achieved a specified percentage of its design compressive strength.
Explanation: Form removal timing is determined by the concrete's strength. Vertical forms can often be removed sooner than horizontal forms once the concrete has reached a sufficient percentage (e.g., 5-10%) of its design compressive strength, as it can then support its own weight.
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- When interpreting a foundation plan, a dashed line with 'P. WALL' typically represents which of the following?
- A site plan shows contour lines with an interval of 0.5 m. If two adjacent contour lines are labelled 124.0 m
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