ACI Concrete Field Testing Technician - Grade I Practice Exam

When obtaining a concrete sample, the selected container for collection should be clean and nonabsorbent to prevent contamination and ensure the integrity of the sample. A wheelbarrow, while practical for transporting concrete, is not suitable for sampling because it may not provide a stable or sufficiently clean environment for capturing an accurate representation of the concrete's properties.

On the other hand, a plastic bucket, metal pan, and a flat, clean nonabsorbent mixing board are all appropriate choices since they can be easily cleaned, are stable for holding the concrete, and do not introduce substances that could alter the composition of the sample. Each of these options allows for a clear and uncontaminated collection process, essential for ensuring accurate testing results. Using a wheelbarrow as a collection tool can lead to inconsistent sampling and diminish the reliability of test outcomes.