ACI Concrete Field Testing Technician - Grade I Practice Exam

What should be done with the composite sample before testing?

1. Weight it

2. Thoroughly remix it

3. Allow it to settle

4. Measure its volume

The correct answer is: Thoroughly remix it

Before testing concrete, it is essential to thoroughly remix the composite sample to ensure uniformity. Concrete is a composite material consisting of various components like cement, water, aggregates, and admixtures. Over the process of collection and transportation, these components can separate or settle. By remixing, you are helping to distribute these components evenly throughout the sample, which ensures that the test results accurately reflect the properties of the concrete mix as intended. This thorough remixing process is vital, especially for tests measuring workability, strength, and other properties, because any inconsistencies in the sample can lead to misleading results. Ensuring a uniform sample helps the technician perform tests that yield reliable and reproducible data regarding the concrete's characteristics.