Carpenter Red Seal Exam Prep · Question
A concrete slab was poured with a Type 30 (HE) cement at an average temperature of 20°C. Compared to a slab poured with Type 10 (GU) cement under identical conditions, how would the curing time to reach a specified early strength likely differ?
Type 30 (HE) cement (High Early Strength) is formulated to achieve strength more rapidly than Type 10 (GU) (General Use) cement. Therefore, concrete made with T
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Question: A concrete slab was poured with a Type 30 (HE) cement at an average temperature of 20°C. Compared to a slab poured with Type 10 (GU) cement under identical conditions, how would the curing time to reach a specified early strength likely differ?
Answer options:
- Type 30 (HE) concrete would require a longer curing time. ✅ Type 30 (HE) concrete would require substantially less curing time.
- The curing time would be identical for both types of cement.
- Type 30 (HE) is not typically used for slabs, so comparison is not relevant.
Correct answer: Type 30 (HE) concrete would require substantially less curing time.
Explanation: Type 30 (HE) cement (High Early Strength) is formulated to achieve strength more rapidly than Type 10 (GU) (General Use) cement. Therefore, concrete made with Type 30 (HE) cement would typically require substantially less curing time to reach a specified early strength, such as for formwork stripping, under similar temperature conditions.
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