Using different sizes of rubber particles in concrete as part of the fine aggregates affects the  workability  and  water  permeability  considerably  more  than  the  fresh density  and concrete strengths.?Concrete  prepared  with  the  larger  rubber  particles  showsa  better  workability  than those with  finer  ones.Conversely,  concrete  with  the  finer  rubber  particles  has  a  better performance  in  strengths  and  water  permeability  than  those  with  the  larger  rubber particles.?Varying  sized  rubber  aggregates  with  continuous  grading  offer  better  workability  and resistance to water permeability compared to the singly-sized rubber particles.In terms of the strength of concrete, the varying sized rubber performed similar to the finer rubber particles in the tests when added to the concrete mix.It decreases gradually with the simultaneous increase of recycled aggregate and rubber replacement ratio Different substitution has a different effect on the reduction level of this concrete material.