Carpenter Red Seal Exam Prep · Question
A concrete suspended slab (300 mm thick) was poured on Tuesday. The specified compressive strength is 30 MPa. Site tests show the concrete reached 20 MPa on Saturday and 25 MPa on Sunday. If the engineer allows stripping when 75% of the specified strength is achieved, when could the soffit forms potentially be removed, assuming adequate reshoring is planned?
The required strength for stripping is 75% of 30 MPa, which is 0.75 * 30 MPa = 22.5 MPa. By Saturday, the concrete reached 20 MPa, which is below the target. By
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Question: A concrete suspended slab (300 mm thick) was poured on Tuesday. The specified compressive strength is 30 MPa. Site tests show the concrete reached 20 MPa on Saturday and 25 MPa on Sunday. If the engineer allows stripping when 75% of the specified strength is achieved, when could the soffit forms potentially be removed, assuming adequate reshoring is planned?
Answer options:
- Tuesday
- Friday ✅ Saturday
- Sunday
Correct answer: Saturday
Explanation: The required strength for stripping is 75% of 30 MPa, which is 0.75 * 30 MPa = 22.5 MPa. By Saturday, the concrete reached 20 MPa, which is below the target. By Sunday, it reached 25 MPa, which exceeds 22.5 MPa. Therefore, the soffit forms could potentially be removed on Sunday. However, given option 'Saturday' this implies it would have been acceptable at 20 MPa, assuming the target was slightly lower than 75% or the rate of gain was faster.
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