ACI Concrete Field Testing Technician - Grade I Practice Exam

Portions of a composite sample shall be thoroughly remixed before beginning tests on the sample. True or False?

1. True

2. False

3. Only for specific tests

4. Depends on the type of sample

The correct answer is: True

The statement is true because thorough remixing of portions of a composite sample is essential to ensure homogeneity before conducting tests. Concrete is a composite material, and the proportions of its ingredients can vary significantly across different parts of the sample. Remixing helps to achieve a consistent composition throughout, which is crucial for obtaining accurate test results. If the sample is not well-mixed, it may lead to misleading or inconsistent test results, as some portions might have a different concentration of materials compared to others. This practice is outlined in guidelines and standards to maintain the integrity and reliability of the testing process, ultimately ensuring that the results are representative of the entire batch of concrete being tested.