ACI Concrete Field Testing Technician - Grade I Practice Exam

If concrete is 1/2 inch above the top of the measure after consolidation, what should be done?

1. Add more concrete

2. Remove excess with a trowel

3. Let it settle

4. Use a vacuum to remove excess

The correct answer is: Remove excess with a trowel

When concrete is 1/2 inch above the top of the measure after consolidation, the appropriate action is to remove the excess with a trowel. This is important because accurate measurement of concrete is crucial for obtaining reliable test results. By leveling the concrete to the top of the measure, you ensure that the sample reflects the intended volume and density of the concrete being tested. Leaving the excess concrete would skew the results and yield data that doesn't represent the actual material properties. Using a trowel is a standard practice in concrete testing as it allows for precise adjustments without disturbing the integrity of the sample. The other options wouldn’t achieve the goal of precision in testing. Adding more concrete would worsen the excess situation; letting it settle could lead to an inconsistent surface or further inaccuracies in measurement; and using a vacuum might disrupt the concrete structure more than necessary. Thus, removing the excess with a trowel is the most effective and accurate method to prepare the concrete sample for testing.