What does the term "slump" refer to in concrete testing?

The term "slump" in concrete testing specifically refers to the measure of how much freshly mixed concrete settles or "slumps" when a standard cone is removed from the sample. This measurement is essential because it provides an indication of the workability or consistency of the concrete. A higher slump value generally suggests that the mix is more workable and can flow more easily, which is particularly important for applications where the concrete needs to be poured into forms or around reinforcing steel.

Monitoring slump is critical for ensuring that the concrete meets the specifications required for the job, as varied slump levels can affect the strength, durability, and performance of the concrete once it has set. By understanding slump values, technicians can make informed decisions about the water-cement ratio and other mix design adjustments needed to achieve the desired characteristics in the final product.