The testing strength rating for concrete is usually based on _____ of curing time.
A) 28 days
B) three weeks
C) 72 hours
D) 24 hours

Name: The testing strength rating for concrete is usually based on _____ of curing time. A) 28 days B) three weeks C) 72 hours D) 24 hours
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Question

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The standard testing strength rating for concrete is usually based on 28 days of curing time. This is because it takes about 28 days for concrete to reach its design strength and attain maximum durability.

The Testing Strength Rating for Concrete Is Usually Based on _____