Florida DOT Concrete Batchman/Operator Practice Exam

What might happen if concrete is not mixed adequately before delivery?

1. The concrete will set too quickly

2. The concrete will be too viscous

3. The concrete may not achieve required strength

4. The concrete will harden in the truck

The correct answer is: The concrete may not achieve required strength

When concrete is not mixed adequately before delivery, the most significant consequence is that the concrete may not achieve the required strength. Proper mixing ensures that all components—cement, water, aggregates, and any additives—are uniformly distributed, allowing for the chemical reactions necessary for the concrete to cure effectively. Inadequate mixing can lead to an uneven distribution of materials, which can result in weak spots within the concrete. These weak areas can compromise the overall integrity and performance of the structure being built. Strength is vital in concrete's function, especially in load-bearing applications, and without proper mixing, the final product may have flaws that prevent it from performing as intended. Other factors such as the workability and setting characteristics of the concrete can be influenced by mixing, but achieving the required strength is paramount in construction practices.