American Concrete Institute (ACI) Practice Exam

What is the maximum allowed transportation time for test specimens, in hours?

2 Hours 4 Hours 6 Hours 8 Hours

Correct Answer:

4 Hours

Explanation:

The main idea is keeping the time from batching to arrival at the testing lab short enough that the concrete’s initial set and moisture state don’t change the test results. Four hours is the commonly allowed window because, beyond that, ongoing hydration and temperature/ moisture changes can make the cylinder strength unrepresentative of the actual batch. Sticking to a four-hour transport limit helps ensure the specimens reflect how the concrete performed in construction. If this window can’t be met, the practice is to remake specimens from the same batch and retest, since the original results may no longer be valid.

Access more questions from this quiz

Continue to American Concrete Institute (ACI) Practice Exam for more practice questions and the full quiz experience.

Access More Questions