What does a higher slump in concrete indicate regarding its consistency?

A higher slump in concrete indicates a greater fluidity and workability of the mix. Slump tests are performed to measure the consistency of concrete; a higher slump value suggests that the concrete is more pliable and easier to shape and place. This increased fluidity results in a concrete mix that can flow better into forms and around reinforcement without excessive effort.

The relationship between slump and workability is essential in construction, as more workable concrete can be beneficial for a variety of applications, from intricate formwork to ensuring good compaction and coverage around rebar. Proper workability allows for better mixing and handling, reducing the risk of issues like segregation or improper setting.

In this context, the other options do not align with the characteristics measured by slump. More viscous concrete indicates less fluidity, while less flexibility suggests a stiffer mix that is not ideal for most applications. The idea that a higher slump leads to increased cracking is also misleading, as cracking is typically influenced by factors such as curing, shrinkage, and environmental conditions rather than directly by the water-to-cement ratio represented by slump.