In a slump test- ● Mould shape : Frustum of a cone ● Dimension of mould: height 30 cm, bottom diameter 20 cm and top diameter 10 cm. ● Dimension of tamping rod- made up of steel 16 mm diameter, 60cm long and rounded at one end. ● Concrete mix in 4 approximately equal layers. ● Tamp each layer with 25 strokes in a uniform manner