What Is Self Compact Concrete | What Is Slump Flow Test | Equipment for Slump Flow Test | Procedure of Slump Flow Test

Table of Contents

What Is Self Compact Concrete?

Making concrete structures without vibration has been done in the past. For example, the placement of concrete under-water is done by the use of tremie without vibration. Shaft concrete and mass concrete may be successfully placed without vibration.

But the above examples of concrete are normally of lower strength and difficult to obtain consistent quality. Modern application of SCC (self-compacting concrete) is focussed on high performance, better and more reliable, and uniform quality.

List of Test Methods for Workability Properties of Self Compacting Concrete (SCC).

Slump flow by Abrams cone.
T50 cm Slump flow
J-ring
V-funnel
V-funnel at T5 minutes
L-box
U-box
Fill-box
GTM Screen Stability Test
Ouimet

In this article, we are discussion & Procedure Slump Flow Test

What Is Slump Flow Test?

The slump flow test is done to assess horizontal flow of concrete at the absence of obstructions. It is the most commonly used test and gives a good assessment of filling ability. It may be used at the site. The test also indicates the resistance to segregation.

Equipment for Slump Flow Test

Slump Cone

The usual slump cone having a base diameter of 200 mm, top dia. 100mm, and height 300mm are used.

Base Plate For Slump Flow test

A stiff base plate square in shape is having at least a 700 mm side. Concentric circles are marked around the center point where the slump cone is to place. A firm circle is drawn at 500 mm diameter

A trowel

This tool is used to place cement mortar.

Scoop

This use in QC department for the material.

Measuring tape

To measure the length.

Stopwatch

Use for time record

Procedure of Slump Flow Test

About 6 liters of concrete is needed for this test.
Place the baseplate on level ground.
Keep the slump cone centrally on the base plate.
Fill the cone with the scoop.
Do not tamp.
Simply strike off the concrete level with the trowel.
Remove the surplus concrete lying on-base place.
Raise the cone vertically and allow the concrete to flow freely.
Measure the final diameter of the concrete in two perpendicular directions and calculate the average of the two diameters.
This is the slump flow in mm.
Note that there is no water or cement paste or mortar without coarse aggregate is seen at the edge of the spread concrete.

Calculations of Slump Flow Test

Largest diameter of slump flow (dm) = _______ mm
Diameter perpendicular to largest diameter (dr) = _______ mm
Slump flow = (dm+dr) /1
Results of Slump Flow Test
The slump flow of Self compacting concrete is _______ mm
Interpretation of Slump Flow Test
The higher the flow value, the greater its ability to fill formwork under its own weight.
A value of at least 650 mm is required for SCC (Self Compact Concrete).
In case of severe segregation, most coarse aggregate will remain in the center of the pool of concrete and mortar and paste at the periphery of concrete.

T50 Slump Flow Test

The procedure for this test is same as for slump flow test. When the slump cone is lifted, start the stopwatch and find the time taken for the concrete to reach a 500 mm mark.
This time is called T50 time.
This is an indication of the rate of spread of concrete.
A lower time indicates greater flowability.
It is suggested that T50 time may be 2 to 5 secs.

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Slump Flow Test Results

Slump Flow Test Vs Slump Test

A separate test, known as the flow table, or slump-flow, test, is used for concrete that is too fluid (non-workable) to be measured using the standard slump test, because the concrete will not retain its shape when the cone is removed.

Slump Flow Test Range

The slump flow test, using the traditional slump cone, is the most common field test and is in the process of being standardized by ASTM. The slump cone is completely filled without consolidation, the cone lifted, and the spread of the concrete measured. The spread can range from 18 to 32 inches (455 to 810 mm).

Slump Flow Test Apparatus

Base plate of a stiff non-absorbing material, at least 700mm square, marked with a circle marking the central location for the , and a further concentric circle of 500mm diameter. Trowel. Scoop. Ruler.

Concrete Flow Test

The flow test is performed to measure workability of concrete. As name suggests, in this test the workability of concrete is measured by examining the flowing property of concrete. The flow test is a simple laboratory test.

Slump Flow Test Procedure

Fill the cone with the scoop. Do not tamp, simply strike off the concrete level with the top of the cone with the trowel. Remove any surplus concrete from around the base of the cone. Raise the cone vertically and allow the concrete to flow out freely.

Slump Flow Test Concrete

The slump flow test is used assess the horizontal free flow of self compacting concrete in the absence of obstructions. It was first developed in Japan for use in assessment of underwater concrete. The test method is based on the test method for determining the slump.

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