Florida DOT Concrete Batchman/Operator Practice Exam

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Portland Cement Type IS is best characterized by?

High early strength
Moderate sulfate resistance
High slag content as a constituent
Usage exclusively in aggressive environments

The correct answer is: High slag content as a constituent

Portland Cement Type IS is best characterized by having high slag content as one of its constituents. This type of cement is specifically designed to incorporate granulated blast-furnace slag, which is a by-product from the steel manufacturing process. The inclusion of slag not only enhances the durability of the concrete but also improves certain performance characteristics such as workability and resistance to certain environmental conditions. While it may also exhibit moderate resistance to sulfates, the defining characteristic of Type IS is its composition that includes a significant amount of slag. This makes it particularly useful in applications where additional durability is required, such as in structures exposed to aggressive conditions. The utilization of slag helps in reducing the overall carbon footprint of the cement production process and can also contribute to a more sustainable construction practice when used appropriately.