AS 1012.3.5:2015 pdf download.Methods of testing concrete Method 3.5: Determination of properties related to the consistency of concrete- Slump flow, Ts and J-ring test.
5.8 Veighted collar
Weighted collar (optional), having a mass of at least 9 kg. to fit slump cone Lsee Figure 3(b)].
NOTl: The weighted collar allows the test to be carried out by one person.
5.9 Spirit level
Suitable to check that the base plate is level.
5.10 Buckets and funnel (collar)
‘lo obtain, remix and pour the concrete into the mould.
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6.1 Field sampling
For concrete sampled in the field, the test sample shall be obtained in accordance with the requirements of AS 1012.1.
6.2 laboratory sampling
For concrete made in the laboratory, the test sample shall be prepared in accordance with
AS 1012.2.
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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 flO 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)j, is carried out without interruption and is completed within an elapsed time of 2.5 mm.
(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 tilled 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.
j) Maintain a firm downward pressure at all times until the slump cone is removed. Immediately remove the slump cone from the concrete by raising it slowly and carefully in a vertical direction, allowing the concrete to subside as it flows concentrically along the test surface. Complete the operation of raising the slump cone in 3 ±1 s in a steady vertical lift without causing any tilting, lateral or torsional movement of the slump cone and without interfering with the flow of the concrete.
(k) If the T%oo time (flow rate) is required, start the stopwatch immediately the slump cone ceases to be in contact with the base plate and record the time to the nearest 0.1 second, for the spreading concrete to reach the marked 500mm (see Figure 2) circle at any point.
NOTE: It is possible for the stopwatch to be operated by the concrete tester or another person under the concrete tester’s supervision.
(I) ait for the concrete to stop flowing and without disturbing the base plate or
concrete measure and record the largest diameter (d1) of the resulting circular spread of concrete to the nearest 5 mm. Measure and record a second diameter (d2) of the circular spread at an angle approximately perpendicular to the first measured diameter (d1), to the nearest 5 mm. [See Figure 4(a).]
If the measurement of the two diameters differs by more than 50 mm, the test is invalid and shall he repeated.AS 1012.3.5 pdf download.