Florida DOT Concrete Batchman/Operator Practice Exam

What is included in the yield calculation of a concrete mix?

1. Only the weight of aggregates

2. Only the volume of water

3. Total absolute volumes of all ingredients including air

4. Total weight of cement only

The correct answer is: Total absolute volumes of all ingredients including air

The yield calculation of a concrete mix involves determining the total absolute volumes of all ingredients, including air. This is critical because the yield is essentially the total volume of fresh concrete that can be produced from a specific mix design. The calculation considers the volumes contributed by each component, such as cement, aggregates, and water, along with any air that may be entrained in the mix. Accurate yield calculation is essential for ensuring the correct proportions of ingredients to achieve the desired concrete properties, as well as to meet specifications in construction projects. When calculating yield, omitting any of the ingredients can lead to discrepancies in the actual amount of concrete produced versus what is expected. This can affect the strength, durability, and workability of the final product, making it vital to include all components in the yield calculation.