ACI Certification Practice Exam

What is a common use of determined density in concrete testing?

1. For yield calculations

2. To adjust the mix ratio

3. To estimate the curing time

4. To measure workability

The correct answer is: For yield calculations

Determined density in concrete testing is commonly used for yield calculations. Yield refers to the volume of fresh concrete that can be produced from a given amount of materials based on the specific proportions in a mix. By measuring the density of the concrete, one can relate the weight of the concrete to its volume, which is essential for accurately calculating how much finished concrete is produced. This information is critical for batching processes and ensuring that the amount produced meets project specifications. While density can provide insights into the quality and composition of the concrete, it is particularly relevant in yield calculations because it directly correlates with the amount of materials required. Knowing the density allows engineers and contractors to determine if they are achieving the correct mix and whether they are on track to meet their performance and cost objectives. Other options may relate to different aspects of concrete performance or formulation, but the primary association of density is with yield calculations.