Florida DOT Concrete Batchman/Operator Practice Exam

What is the maximum temperature water or aggregates should not exceed?

1. 130°F

2. 140°F

3. 150°F

4. 160°F

The correct answer is: 150°F

The maximum temperature that water or aggregates should not exceed is 150°F. This temperature is crucial because using excessively hot materials can adversely affect the concrete mix's workability, curing process, and overall strength development. Elevated temperatures can lead to a faster setting time, which may not allow adequate mixing or placement of the concrete, potentially resulting in poor quality and compromised structural integrity. In concrete production, maintaining the right temperature for water and aggregates helps manage the hydration process of the cement. A temperature above the specified maximum can increase the risk of thermal cracking and can also lead to the loss of entrained air, which is critical for the durability and performance of the finished concrete. Therefore, adhering to this temperature limit is vital for ensuring the successful performance of concrete in construction projects.