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In this article we studied the effect of time and mass concentration on the viscoelastic behavior of a clay and slip used in the manufacture of ceramics from CERAMIR Algeria. The generalized model of Kelvin-Voigt is successfully applied to fit the creep and recovery data and to analyse the viscoelastic properties of clay and slip. The increase of time of creep-recovery shows a slow increase in Newtonian viscosity corresponding to the steady-state and instantaneous and delayed elastic compliance. On the other hand, the increase in the mass concentration of clay causes a rapid increase in the Newtonian viscosity corresponding to the steady-state and a decrease in instantaneous and delayed elastic compliance. [ABSTRACT FROM AUTHOR]