Florida DOT Concrete Batchman/Operator Practice Exam

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TYPE D admixtures are known for being what?

Accelerating
Water-reducing AND retarding
Non-chloride
Corrosion-inhibiting

The correct answer is: Water-reducing AND retarding

Type D admixtures are known for their dual functionality as both water-reducing and retarding agents. They serve to enhance the workability of concrete while simultaneously delaying the setting time. This capability is particularly useful in situations where extended workability is necessary, such as in hot weather conditions or when the concrete must be transported over long distances before placement. By reducing the water content without compromising the concrete's strength, Type D admixtures help improve the overall performance of the concrete mix. Their retarding property allows for flexibility in placement, ensuring that the concrete can be worked with for a longer period without the risk of premature setting. Other types of admixtures may focus solely on accelerating setting times or preventing corrosion, but Type D uniquely combines water reduction with retardation, making it a versatile choice for various applications in concrete work.