Slump Cone to BS1881 Concrete workability can be measured using the Slump test. This is carried out by filling the Slump Cone with fresh concrete in three layers, tamping each one and levelling to the top of the cone. The Slump Cone is then removed and the distance the concrete falls or "Slump" is measured with a rule. Spun Steel Construction. No internal seam. Powder Coated for durability. Weight: 2.2kg. BS1881 PART 102. EN12350-2.