Sampling - Performance Exam Practice

The following questions are derived from the actual checklist used in the ACI performance examination. Click each question to view the answer.

In two or more portions of concrete

At regularly spaced intervals

From the middle of the batch

Repeatedly pass a receptacle through the entire discharge stream

Completely divert the discharge stream into a sample container

Discharge the contents of the paving mixer

Obtain samples from at least five different portions of the pile

Sun, wind, and rapid evaporation

Contamination