Concatenate - help

Hi
Here is what I am trying to do
=CONCATENATE(I36:I39) I am trying to add the text in column I from 36 to 39. But when i use the above formula I am not getting the result.. I am just getting the first row back. I know we can concatenate using this =CONCATENATE(i36, i37, I38) BUT as i want to concatenate like 30 rows and very frequently i would like to have a way where i can just show the range of cells to be added. Appreciate any help and your time.