AS 1012.3.5:2015 Methods of testing concrete
7 PROCEDURE
The procedure shall be as follows:
(a) For concrete sampled in the field and in the laboratory commence the test immediately following the completion of mixing the test sample.
(b) Remix samples of concrete prior to testing by transferring from initial sub-sample buckets into other buckets of equivalent size to ensure a homogenous sample.
(c) Ensure that the internal surface of the slump cone is clean and free from set concrete.
(d) Moisten the internal surfaces of the sample bucket, funnel and slump cone and the base plate by wiping with a damp cloth immediately before commencing each test.
(e) If required, place the specified J-ring assembly in the centre of the 200 mm diameter circle marked on the base plate.
(f) Place the slump cone carefully on a stable and levelled base plate, which is free from vibration or shock. Hold the slump cone firmly in place. Position the slump cone with the larger opening coincident with the 200 mm circle on the base plate (see Figure 2). Maintain the slump cone in position while it is being filled, ensuring that no concrete can leak from under the cone (see Figure 3).
(g) Ensure that the procedure from the start of filling to the removal of the slump cone [i.e. Steps (h) to (l)], is carried out without interruption and is completed within an elapsed time of 2.5 min.
(h) Fill the slump cone by pouring in concrete continuously until it reaches the top edge without vibration or tamping. Over-fill the slump cone slightly and if a detachable conical collar or funnel is used (see Note) then remove this.
NOTE: A detachable conical collar or funnel may be used to facilitate filling the slump cone. The collar or funnel should not penetrate the slump cone by more than 5 mm.
(i) Strike off the surface of the concrete level with the top of the slump cone by means of a screeding and rolling motion of the rod so that the slump cone is filled exactly.Quickly remove any concrete overflow from around the base of the mould to preclude interference with the movement of the flowing concrete and while doing so avoiding any movement or vibration of the slump cone.