SECTIONS 15 AND 16 REFERENCE or identify the use of the slump test, which has very specific procedures described in ASTM C 143/C 143M. The slump test was originally developed to provide a measure of consistency of freshly mixed concrete [77]. The basic test is performed by compacting a sample of concrete in a mold in the shape of a frustum of a cone with a height of 12 in. The concrete is compacted by tamping with a 5/8 in. smooth rod. The mold is raised vertically for removal. The slump measurement is the vertical drop of the concrete from its original height (12 in.) to the displaced position of the original center after removal of the mold.