Florida DOT Concrete Batchman/Operator Practice Exam

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Which type of cement is composed of up to 95% blast-furnace slag?

Type I
Type IS
Type II (MH)
Type III

The correct answer is: Type IS

The type of cement that is composed of up to 95% blast-furnace slag is known as Type IS cement. Type IS, or slag cement, incorporates a significant amount of ground granulated blast-furnace slag (GGBS), which enhances the durability and strength of concrete by reducing porosity and improving resistance to aggressive environments. The high volume of slag in this type of cement also helps in reducing the heat of hydration, making it ideal for projects where thermal cracking may be a concern. The other cement types listed do not have this specific composition. Type I cement is a general-purpose cement used for most construction needs but does not contain blast-furnace slag. Type II (MH) is a moderate heat cement that may contain some additional compounds, but it is not characterized by a high slag content. Type III cement is a high-early-strength cement that primarily focuses on achieving strength rapidly, rather than incorporating significant amounts of blast-furnace slag. Thus, the correct identification of Type IS reflects its unique composition and the benefits it offers in concrete production.