Carpenter Red Seal Exam Prep · Question
A concrete slab is poured in unheated conditions where the ambient temperature is consistently around +5°C. For a typical Type 10 (GU) cement, what is the approximate minimum time before forms can be stripped from non-load-bearing vertical surfaces, assuming no strength tests are available?
While exact times vary with mix and additives, industry practice and general guidelines for Type 10 (GU) cement at +5°C often suggest 1 to 2 days for non-load-b
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Question: A concrete slab is poured in unheated conditions where the ambient temperature is consistently around +5°C. For a typical Type 10 (GU) cement, what is the approximate minimum time before forms can be stripped from non-load-bearing vertical surfaces, assuming no strength tests are available?
Answer options:
- 12 hours ✅ 24 hours
- 36 hours
- 48 hours
Correct answer: 24 hours
Explanation: While exact times vary with mix and additives, industry practice and general guidelines for Type 10 (GU) cement at +5°C often suggest 1 to 2 days for non-load-bearing vertical forms to gain enough strength to prevent surface damage upon stripping. 24 hours is a common rule of thumb given the cooler temperature, as per CSA A23.1.
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