BS/EN 12350-3-2019 pdf download.Testing fresh concrete Part 3 : Vebe test.
a) Container, made of metal not readily attacked by cement paste, cylindncal in shape (A), having an internal diameter of (240 ± 5) mm and a height of (200 ± 2) mm. The thickness of the wall shall be approxImately 3 mm and that of the base approximately 7,5 mm. The container shall be watertight and of sufficient rigidity to retain Its shape under rough usage. it shall be fitted with handles and brackets, the latter enabling it to be securely clamped to the top of the vibrating table (G) by means of wing nuts (H);
b) Cone, having the same specification and dimensions as the Hollow Cone specified in EN 12350-1 except the handles shall be at approximately two thirds of the height and there shall be no fixing clamps or foot pieces;
c) Disc, transparent, horizontal (C). attached to a rod ) which slides vertically through a guide sleeve (E) mounted on a swivel arm (N) and which can be fixed in position by a screw (Q). The swivel arm also supports a funnel (D). the bottom of which coincides with the top of the cone when the latter is positioned concentrically in the container. The swivel arm is located by a holder (M) and can be fixed in position by a screw (9. When in the appropriate position, the axes of the rod and of the funnel shall be coincident with the axis of the container. The transparent disc shall be (230 ± 2) mm in diameter and (10 ± 2) mm in thickness. A weight (P) placed directly above the transparent disc shall be provided such that the moving assembly comprising rod, transparent disc and weight has a mass of (2 750 ± 50) g. The rod shall be provided with a scale at 5 mm intervals to record the slump of the concrete:
d) Vibrating table (G), having minimum dimensions 01(380 ± 3) mm in length and (260 ± 3) mm in width and supported on four rubber shock absorbers on a hollow base (K), which in turn rests on three rubber feet. A vibrator unit (L) is securely fixed to the bottom of the table. The vibrator shall operate at a nominal frequency of 50 Hz to 60 Hz and the vertical amplitude of the table with the empty container on top of it shall be approximately ± 0.5 mm.
6 Sampling
The sample shall be obtained in accordance with EN 12350-1.
The sample shall be re-mixed using the remixing container or tray and the square mouthed shovel before carrying out the test.
Alternative sampling procedures may be given in provisions valid in the place of use of the concrete.
7 Procedure
Place the Vebe meter on a rigid horizontal base, ensuring that the container (A) is firmly fixed to the vibrating table (G) by means of the wing nuts (H). Dampen the cone (B) with the moist cloth and place it in the container. Swing the funnel (D) into position over the cone and lower onto the cone. Tighten the screw (F) so that the cone cannot rise from the bottom of the container.
From the sample of concrete obtained in accordance with Clause 6, fill the cone in three layers, each approximately one-third of the height of the cone when compacted. Compact each layer with 25 strokes of the compacting rod, ensuring that the strokes are uniformly distributed over the cross-section of each layer.
For the bottom layer, this will necessitate inclining the rod slightly and positioning approximately half the strokes spirally toward the centre. Compact the concrete throughout its whole depth, taking care not to strike the base. Compact the second layer and the top layer throughout its depth, so that the strokes just penetrate into the underlying layer. In filling and tamping the top layer, heap the concrete above the cone before tamping is startea. Ii necessary, aaa rurtner concrete to maintain an excess aoove the top of the cone throughout the compacting operation.
After the top layer has been tamped, loosen the screw (F) and raise the funnel (D) and swing it out of the way and tighten the screw (F) in the new position. Ensure that the cone (B) does not rise or move prematurely and concrete is not allowed to fall into the container (A).BS/EN 12350-3-2019 pdf download.
BS/EN 12350-3-2019 pdf download
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