How is slump measured in concrete testing?

The correct method for measuring slump in concrete testing is by using a slump cone. This testing process involves a standardized procedure where a conical mold (the slump cone) is filled with fresh concrete. After the cone is carefully lifted vertically, the concrete slumps, and the reduction in height is measured. This measurement of how much the concrete settles or slumps when the cone is removed provides valuable information about its workability and consistency.

This method is essential in quality control during concrete production, as it helps in assessing whether the concrete mix has the appropriate consistency for the intended use. Other methods, such as using a laser measurement tool or a graduated cylinder, do not provide direct measurements of slump and are not standard practices for this specific testing procedure. Weighing the sample is typically related to determining the density or specific gravity of concrete rather than its slump and workability characteristics.