What test is used to determine the relative consistency of concrete?

The slump test is specifically designed to determine the relative consistency or workability of concrete. In this test, a mold is filled with freshly mixed concrete in a cone shape, and then the mold is removed. The vertical drop of the concrete from the mold is measured. This drop, or "slump," reflects the concrete's ability to flow and its consistency, which is critical for assessing how well it can be placed and compacted in the desired location.

Workability is essential for ensuring that the concrete can be properly maneuvered during pouring, reducing the risk of defects in the cured concrete. The results of the slump test help engineers and contractors understand the characteristics of the concrete mix and whether adjustments are needed for specific applications.

In contrast, other tests mentioned, such as compression, flexural, and shear tests, primarily assess the strength and structural performance of hardened concrete rather than its consistency in the fresh state.