North Carolina Building Contractor License Practice Exam

What does a slump measure in grout?

1. Viscosity

2. Consistency

3. Temperature

4. Weight

The correct answer is: Consistency

A slump test measures the consistency of materials such as grout. Specifically, it evaluates how much a sample of fresh grout flows or settles when a conical mold is removed. In this context, consistency refers to the degree of fluidity or stiffness of the grout mixture, indicating its workability for applications such as pouring, bonding, or filling voids. The amount of slump observed after the test provides insight into the mix's performance characteristics, allowing contractors to assess whether it meets the required specifications for a particular application. For instance, a high slump may indicate a more fluid mixture suitable for specific tasks, while a low slump suggests a stiffer mix that may be better for structural applications.