Florida DOT Concrete Batchman/Operator Practice Exam

A high-range water reducing admixture must meet the requirements of which types?

1. Type G and Type H

2. Type F or Type I

3. Type A or Type B

4. Type C or Type D

The correct answer is: Type F or Type I

A high-range water reducing admixture is designed to significantly decrease the water-cement ratio in concrete while maintaining workability. It is commonly known for enhancing the performance of concrete, particularly in high-strength applications. The correct answer indicates that it must meet the requirements for Type F or Type I admixtures. Type F admixtures, often termed superplasticizers, are specifically formulated to dramatically enhance fluidity without increasing water content. This makes them ideal for producing high-strength and high-performance concrete. On the other hand, Type I admixtures provide a more general level of performance enhancement while still allowing for the reduction of water, suitable for normal concrete applications. This distinction highlights the importance of selecting the right type of admixture depending on the desired properties of the concrete mix. Understanding these types allows concrete batchmen and operators to formulate mixes that meet specific structural standards and performance criteria effectively.