Used for estimation of workability of portland cement concrete in terms of depth of penetration of a hemispherical metal weight into the plastic concrete. Double of Kelly Ball reading indicates approximately the slump of the concrete tested.
The apparatus consists of the following :-
- A hemispherically shaped mild steel weight of approximately 14 kg with graduated handle.
- A stirrup frame which guides the hemispherical weight and also serves as datum for measuring penetration of the ball.
- The apparatus is used to determine the workability of Portland cement concrete.
- The Kelly ball test is considered to be simple and much faster than the slump test.
- Twice the Kelly ball reading approximately equals the slump.
- It consists of a cylinder with a ball-shaped bottom and handles, together weighing 15 kg.
- A strip frame guides the handle and serves as a reference for measuring the depth of penetration.
- The handle is graduated in mm.
- Penetration can be recorded to the nearest 0.5 mm.