It is widely used in site works. The apparatus used in this method is a metallic mould of frustum cone structure having dimension as follows
Top diameter-10cm
Bottom diameter-20cm
Height-30cm
Process
1.First mould is placed on a smooth horizontal and rigid surface.
2.Then mould is filled with concrete by rodding in four layer.
3.After rodding top layer the top surface is smoothen by trowel.
4.Then the mould is removed vertically up.
5.After total removal of mould concrete will subside. The amount of subside is the slump of that concrete.
