ACI Certification Practice Exam

What does Test Method C173/C173M specify regarding the treatment of concrete in a meter?

1. A minimum time for inverting and agitating the meter

2. A maximum weight limit for concrete

3. Types of aggregates to use

4. The order of mixing components

The correct answer is: A minimum time for inverting and agitating the meter

Test Method C173/C173M specifically addresses the requirements for the treatment of concrete in a meter, including the procedures related to the sampling and measurement of concrete for specific project needs. The correct focus of this test method concerns ensuring the concrete is properly mixed and handled to achieve accurate results. By specifying a minimum time for inverting and agitating the meter, the method ensures that the concrete is uniformly mixed prior to sampling. This uniformity is crucial because uneven mixing could lead to inaccurate measurements of properties like strength, workability, and durability. Proper treatment of concrete, as highlighted in this method, plays a vital role in the overall quality control and assurance process within concrete construction. The other options, while relevant to concrete handling in different contexts, do not align with the specific parameters set out in Test Method C173/C173M. For instance, the method does not impose weight limits, dictate types of aggregates, or specify the order of mixing components, which are typically covered under other standards or specifications.