Florida DOT Concrete Batchman/Operator Practice Exam

Which approved coarse aggregate sizes are commonly used?

1. #45 and #67

2. #57, #67, and #78

3. #89 and #100

4. Only #57

The correct answer is: #57, #67, and #78

The answer encompasses commonly used coarse aggregate sizes that are appropriate for a variety of concrete applications. The sizes #57, #67, and #78 are established classifications in the aggregate industry, recognized for their utility in concrete mixes. #57 aggregate, for instance, is known for its versatility and is often utilized in concrete production, drainage applications, and as a subbase layer. #67 aggregate typically serves a similar purpose, providing a slightly finer option that can enhance the workability of concrete mixes. #78 aggregate, while not as widely recognized, is included in this grouping for its specific application in areas where size specifications require it. These aggregate sizes are crucial in ensuring the right balance of strength, durability, and workability in concrete, making them the preferred choices for construction projects adhering to Florida Department of Transportation standards. The other options presented do not align with the typical size classifications used in concrete applications or lack the same level of acceptance within the industry for concrete production, which further underscores why this selection is the appropriate one to reflect common practices.