How to check the workability of concrete?
Workability of concrete by Slump Cone Test -
Clean the internal surface of the slump cone
Place it on a level surface
Fill the sample in 4 equal layers
Tamp each layer with 25 strokes by tamping rod
Strokes of above layer should penetrate in to the bottom layer
After completing the top layer, Level the top with trowel or tamping rod
Lift the mould slowly in vertical direction
Measure the level difference between mould height and highest point of the concrete and note down the slump in mm
Slump requirements
For manual pour - 30 – 120mm
For pumping concrete - 120 – 200mm
To find cohesiveness of concrete
Tamp the rod gently in sides of base plate
If concrete slump decreases further gradually, it is good cohesive concrete
Test should be completed within 2 minutes
Workability of concrete by Slump Cone Test -
Clean the internal surface of the slump cone
Place it on a level surface
Fill the sample in 4 equal layers
Tamp each layer with 25 strokes by tamping rod
Strokes of above layer should penetrate in to the bottom layer
After completing the top layer, Level the top with trowel or tamping rod
Lift the mould slowly in vertical direction
Measure the level difference between mould height and highest point of the concrete and note down the slump in mm
Slump requirements
For manual pour - 30 – 120mm
For pumping concrete - 120 – 200mm
To find cohesiveness of concrete
Tamp the rod gently in sides of base plate
If concrete slump decreases further gradually, it is good cohesive concrete
Test should be completed within 2 minutes