T0534-2020Test method for V-shaped funnel of cement concrete mixture

1Purpose, scope of application, and reference standards

This method specifies the test method for funnel-shaped cement concrete mixtures.

This method is applicable for measuring the consistency and filling properties of concrete mixtures,Suitable for evaluating self compacting concrete and large flow mixtures

The viscosity and anti segregation properties of concrete mixtures.

Reference standards

Mixing and on-site sampling methods for cement concrete mixtures(T0521)

2Instruments and materials

2VFunnel-shaped funnel:VThe shape and internal dimensions of the funnel are shown in the figureT05341shown,The capacity of the funnel is approximately10LThe inner surface should be processed and trimmed to a smooth shape.VThe material for making funnels can be metal or wear-resistant plastic. At the exit of the funnel,A quick opening and water-based bottom cover should be attached,The upper edge of the funnel is machined flat,The platform for constructing a smooth support funnel should have an adjustment device,The level of the platform should be ensured,And easy to transport. Should have containers for concrete feeding(Capacity approximately5L,A plastic or iron bucket with a handle attached)Material receiving container(The capacity is approximately12LThe bucket of water)Smooth the top surface of the concrete with a flat scraper that can accurately measure up to0,1sWatch seconds and wet cloth, etc.

2.2stopwatch:The division value is0.1s

23steel ruler:The division value is1mm

2.4other:shovel,Lin Dao, cloth,material bucket(5L)Wait.

3Experimental steps

3.1Sample of cement concrete mixture,Should be pressedT0521Prepare according to the regulations.

32VAfter rinsing the funnel with clean water, place it on the stand,Make its top surface horizontal,The body side is in a vertical state. should

Ensure the funnel is stable. Wipe the inner surface of the funnel with a damp cloth,Keep the surface moist.

3.3Below the funnel outlet,Place the receiving container for the concrete mixture. Leakage during filling of concrete mixture samples

Before the battle,It should be confirmed first whether the bottom cover of the funnel outlet has been closed.

34Using concrete feeding containers to hold concrete mixture samples,Fill the funnel smoothly from the upper end until

overflowing(The concrete mixture sample is approximately10L左右)

3.5Use a scraper to level the top surface of the concrete mixture along the upper end of the funnel

36Scrape the top surface of the concrete mixture flat,Waiting to settle down10s+2safter,Quickly open the bottom cover of the funnel discharge port,In seconds

Record the time from the moment the lid is opened to the moment when the concrete mixture in the funnel is completely emptied,It is stipulated to observe the transparency from the top of the funnel downwards

The Moment,It is the time for concrete to be emptied. simultaneously,Observe and record whether the concrete mixture is blocked or not

37Should be in5minConduct two tests on the sample internally,The arithmetic mean of the two test results should be taken as the test result

The result is accurate to0.1s.

38The test results should meet the following requirements

(1)Emptying time of concrete mixture,Should be precise to0ls

(2)Record the flow condition of concrete mixture, except for the emptying time,The flow conditions during the flow process should also be recorded

Whether there is any blockage, etc.

4Test Report

The test report should include the following contents

(1)Name and execution standards of the required testing items:

(2)Types, specifications, and origins of raw materials, as well as concrete mix proportions

(3)Test date and time

4)Name, model and number of the instrument and equipment

(5)Environmental temperature and humidity

(6)Concrete mixtureYEmptying time of funnel

(7)Other content to be explained