Slumb test

Slump Test

Slum test is the most commonly used method of measuring consistency of concrete which can be employed either in laboratory or at site of work. The apparatus for conducting the slump test essentially consists of a metallic mould in the form of a frustum of a cone having the internal dimensions as under:

         Bottom Diameter   :  20 cm

         Top diameter          :  10 cm

         Height                    :  30 cm
Procedure :



Firstly place the slump is the smooth flat and non absorbent surface. Then mix dry ingredient of concrete, mixing process continues till uniformly colour of concrete is not occured and add required amount of water. Put that  concrete into slumb, 1/4th of its height. Then compact the concrete with the help of tamping rod uniformly all over the area. Place the concrete about half of its height and again compact it. Place the concrete upto 3/4th of the height. And compact 25 times with the help of tamping rod. For the second subsequent layers, the tamping rod should penerate into undelying layers. Strike off the top surface of mould woth the trowel or tamping rod so that mould filled to its top. Remove the mould immediately, enuring that its movement at vertical direction. When the settlement of concrete stops, measure the subsidence of concrete in mm, which is required slump of the concrete.

Slump test 

Table of slum size

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