Florida DOT Concrete Batchman/Operator Practice Exam

What characteristic does Portland Cement Type II have?

1. Supports mass concrete placements

2. Provides exceptional early strength

3. Only suitable for specific chemical environments

4. Increases insulation properties

The correct answer is: Supports mass concrete placements

Portland Cement Type II is specifically designed to be used in mass concrete placements, where the size and amount of concrete poured can result in significant heat generation due to hydration. This heat can lead to cracking and other issues if not properly managed. The modified composition of Type II cement helps to mitigate this issue by providing a slower rate of hydration, which contributes to reduced heat generation. This characteristic makes it particularly well-suited for large pours like foundations, dams, and other massive structures where temperature control within the concrete is critical to maintaining integrity and minimizing the risk of thermal cracking. While early strength, chemical suitability, and insulation properties are important characteristics of other cement types or materials, they do not specifically define Portland Cement Type II as its primary attribute is its favorable performance in mass placements. Understanding these applications is crucial for successful concrete mixing and construction practices.