What is the common name for the test that measures the consistency of concrete?

The slump test is the commonly used method for measuring the consistency or workability of concrete. This test helps inspectors determine how easily the concrete can be mixed, placed, and compacted, which is crucial for achieving the desired strength and durability.

During the slump test, a conical mold is filled with freshly mixed concrete, and once the mold is lifted, the vertical drop of the concrete, known as the "slump," is measured. The degree of slump indicates the workability of the concrete: a higher slump means more workability, while a lower slump indicates a stiffer mix, which could be more challenging to work with.

Understanding the consistency of concrete through this test is essential in highway construction because it directly affects the quality and performance of the final product under various loading conditions. High transportability of fresh concrete is often necessary to ensure it can be effectively placed in forms or behind barriers without segregation or other issues. Therefore, the slump test is a vital tool in ensuring that concrete meets the specifications for a given project.