Slump Test | Slump Cone Test | Slump Test of Concrete | Workability Test of Concrete | Appratus Dimensions | Types of Slump

Slump Test | Slump Cone Test | Slump Test of Concrete | Workability Test of Concrete | Appratus Dimensions | Types of Slump5 min read

What Is Slump Test?

The slump test is conducted to measures the consistency of concrete in that specific batch. Here, consistency of concrete refers to workability or fluidity of freshly made concrete, and therefore it is a measure of the ease with which concrete flows.

Therefore, the Concrete slump test also known as the Workability Test of Concrete is used on-site to measure the workability of concrete or the degree of fluidity in the concrete mix. Generally, loose wet mixes are more workable than drier mixes, but concrete of the same consistency may vary in workability.

The test also shows the change of fluidity of mix between two batch mixes. The slump test of concrete is widely used in construction to a few apparatus and simple procedures.  The slump is also used to ascertain the effects of plasticizers on their introduction in the concrete mix.


Concrete Slump Test

The Slump test concrete is carried out with the help of a conical cone open at both ends. The slump cone filled with concrete lifted up and the resulting height of concrete spread over the surface shows the degree of fluidity, workability, and consistency of the concrete mix. It also indicates the amount of water added is correct or not.


IS Code for Slump Test


Slump Cone Apparatus

Slump Test
Slump Cone Testing

The test is carried out using a conical shape metal body known as a slump cone or Abrams cone that is open at both ends and has an attached handle.

The slump cone has an internal dia. 100 mm at the top and 200 mm at the bottom and the total height of the cone is about 300 mm.


How to Measure Slump of Concrete

The slump value of concrete can be easily measured by using the slump cone test method. In which fresh concrete is poured and filled till the top. Then the cone is lifted slowly, the difference between the top of the cone and top concrete fall is measure as a slump of concrete.


Slump Test Procedure

Slump Cone of concrete procedure,

  1. First, the slump cone is placed on a hard non –  water-absorbing surface. ( metal or concrete)
  2. The Slump cone is filled with freshly mixed concrete in three layers.
  3. Each layer of the concrete mix must be tapped with a 2 ft (600 mm)-long bullet-nosed metal rod measuring 5 8 in (16 mm) in diameter.
  4. After filling the last layer extra concrete must be removed from the top of the cone.
  5. Slump cone then quickly lifted upward with a twisting effect with both hands. The concrete is then free to fall.
  6. After free fall the remaining height is known as slump and is measured to the nearest 5 mm if the slump is 100 mm.

Read More: Concrete Material Calculator


Types of Slump

According to the free fall shape of concrete, the slump is classified into three types termed as true slump, shear slump, or collapse slump.

Slump Test
Types of Slump
Collapse Shear True
In a collapse slump the concrete collapses completely In a shear slump the top portion of the concrete shears off and slips sideways In a true slump, the concrete simply subsides, keeping more or less to shape.
  • If a shear or collapse slump is achieved, a fresh sample should be taken and the test repeated.
  • Only a true slump is of any use in the test.

Standard Slump Test Values

Sr.No. Slump Value Used
1 0 – 25 mm Road Construction
2 10 – 40 mm Foundations with light reinforcement
3 50 – 90 mm Normal reinforced concrete placed with vibration
4 > 100 mm. High workability concrete

Limitations

  • Slump test not applicable when aggregate is more than 40 mm.
  • This test does not give an accurate result for high dry and stiff concrete.

Advantages

  • It has a simple apparatus that can be performed in the laboratory as well as on-site.
  • It requires fewer apparatus compares to other tests.
  • Testing time is too short and gives result quickly;

FAQs:

Slump Test

The slump test is conducted to measures the consistency of concrete in that specific batch. Here, consistency of concrete refers to workability or fluidity of freshly made concrete, and therefore it is a measure of the ease with which concrete flows.

Slump Value for M20 Concrete

Workability for the M20 grade of concrete was achieved by adopting a 0.5 water-cement ratios and a 2% superplasticizer. The slump value for M20 concrete is between 100 and 160 mm.

Types of Slump

According to the free fall shape of concrete, the slump is classified into three types termed as true slump, shear slump, or collapse slump.

Volume of Slump Cone

The standard slump cone volume is 0.00549 cu m. or 0.1939 cu ft.

Slump Cone Test IS Code

Is Code followed for Slump Cone Test is IS 1199 – 1959 Methods Of Sampling And Analysis Of Concrete

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