Kelly Ball Penetration Apparatus

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 :-
(i) A hemispherically shaped mild steel weight of approximately 14 kg with graduated handle.
(ii) A stirrup frame which guides the hemispherical weight and also serves as datum for measuring penetration of the ball.