What is the definition of slump in relation to concrete?

The definition of slump in relation to concrete refers to a measure of the consistency and workability of fresh concrete. It is specifically quantified by the decrease in height of a concrete sample after a conical mold used for testing is removed. This test, known as the slump test, is an important quality control measure in concrete production, as it indicates the mix's ability to flow and fill forms without excessive segregation or bleeding. A higher slump indicates a wetter, more workable mix, while a lower slump suggests that the mix is stiffer and less workable.

In the context of the other options, the measure of concrete's resistance to cracking relates more to the material's tensile strength and durability, rather than its workability. The weight of concrete per cubic foot is related to density but does not provide insights into the mixture's ease of placement and handling. Meanwhile, the maximum compressive strength achievable refers to the strength of hardened concrete rather than its fresh state characteristics. Therefore, understanding slump is vital for ensuring proper handling, placement, and finishing of concrete in various construction applications.