The measurement for slump is made from the top of the mold to which point of the concrete specimen?

The correct response indicates that the measurement for slump is taken from the top of the mold to the displaced original center of the top surface of the specimen. This approach is crucial as it accurately reflects the amount of vertical settlement that occurs when the cone mold is lifted away.

When conducting a slump test, the concrete is compacted into a standard cone mold and then the mold is removed. The slump is measured as the height difference between the top of the mold and the highest point of the concrete that has settled, which is effectively the displaced original center of the top surface. This method provides a consistent and standardized way to measure the workability and consistency of the concrete, which are essential properties in concrete quality control.

The other choices do not accurately represent the accepted procedure for measuring slump. For instance, measuring from the bottom of the mold or the side would not account for how well the concrete has settled, and measuring to the highest point of the specimen alone would ignore the specific displacement caused by the mold being removed, leading to inconsistent and inaccurate results.