BS EN 12350-9-2010 pdf download.Testing fresh concrete Part 9 : Self-compacting concrete – V -funnel test.
This BS EN 12350-9 specifies the procedure for determining the V-funnel flow time for self-compacting concrete. The test is not suitable when the maximum size of the aggregate exceeds 22,4 mm.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
EN 12350-1, Testing fresh concrete — Part 1: Sampling
3 Principle
The V-funnel test is used to assess me viscosity and filling ability of selt-compacting concrete.
A V shaped funnel is filled with fresh concrete and the time taken for the concrete to flow out of the funnel is
measured and recorded as the V-funnel flow time.
4 Apparatus
4.1 V-funnel, made to the internal dimensions and tolerances in Figure 1, fitted with a quick release. watertight hinged or sliding gate at its base and supported by a frame so that the top of the funnel is horizontal with sufficient clearance beneath the gate to place the container underneath.
The V-funnel shall be made from metal which shall be reference material; the surfaces shall be smooth, and not readily attacked by cement paste or be liable to rusting,
If the funnel is made from other materials, in-use performance test data shall be available which demonstrates long-term equivalence with metal.
4.2 Container, to hold the test sample and having a volume not less than 12 I.
4.3 Stop watch, capable of measuring to 0,1 s.
4.4 Straight edge. for striking off concrete level with the top of the funnel.
5 Test sample
A sample of at least 121 shall be obtained in accordance with EN 12350-1.
6 Procedure
Clean the funnel and bottom gate, then dampen all the inside surface including the gate. Close the gate and pour the sample of concrete into the funnel in one operation, without any agitation or mechanical compaction, then strike off the top with the straight edge so that the concrete is level with the top of the funnel. Place the container under the funnel in order to collect the concrete. After a delay of (10 ± 2) s from filling the funnel, open the gate quickly and measure the time i, to 0,1 s, from opening the gate to when it is possible to see vertically through the funnel into the container below for the first time. The time i is the V-funnel flow time.
The flow of concrete from the funnel shall be continuous. If a blockage occurs the test shall be repeated. If a second blockage occurs the concrete lacks the necessary viscosity and filling ability of self-compacting concrete, Report if a blockage has occurred.
7 Test report
The test report shall include:
a) identification of the test sample;
b) location where the test was performed;
C) date and time of test;
d) V-funnel flow time, :, to the nearest 0,5 s:
e) any deviation from the standard test method:
f) declaration by the person technically responsible for the test that it was carried out in accordance with this standard, except as noted in item e).
The report may include:
g) temperature of the concrete at the time of test;
h) age of concrete at time of test (if known).
8 Repeatability and reproducibility
The repeatability r and reproducibility R have been determined by a programme including ten laboratories,
20 operators and two replicates, and Interpreted in accordance with ISO 5725-2.
The resulting values for r and R are given in Table 1.BS EN 12350-9-2010 pdf download.