Which test is used to determine the consistency of concrete?

The slump test is specifically designed to determine the consistency, workability, or fluidity of fresh concrete. This test involves filling a conical mold with concrete and then removing the mold to allow the concrete to slump or settle. The distance that the concrete slumps is measured, indicating its consistency. A higher slump value typically suggests a wetter, more workable mix, while a lower value indicates a stiffer mix.

Other tests listed serve different purposes. The compression test measures the concrete's ability to withstand axial loads and assesses its compressive strength after it has set. The tensile strength test evaluates the ability of concrete to resist tension, which is not inherently a measure of its consistency. Likewise, the flexural strength test focuses on the behavior of concrete under bending loads and does not assess workability or consistency. Thus, the slump test is the most appropriate for determining the consistency of concrete.